Malfunctions of Navien boilers - codes and errors 02, 03, 10 and others, causes and methods of elimination

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Published: March 26, 2020

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Korean Navien gas boilers are characterized by the highest degree of reliability. They work for many years without bothering the owners with breakdowns.

This is confirmed by user reviews and conclusions by heat power specialists, which can be found on the Internet in the public domain. Malfunctions of Navien boilers are quite rare.

This modification of heating units has good software diagnostics, so it will not be difficult for the user to understand the causes of failures and understand what to do to eliminate them.

• 1 Causes of malfunctions of Navien boilers
• 2 Self-diagnosis of Navien boilers
• 3 Error codes and how to fix them 3.1 Error 03
• 3.2 Error 02
• 3.3 Error 10

Design Features

Boiler structure

To attract the attention of buyers, the Korean manufacturer developed a perfect design of the gas unit, minimized the number of breakdowns and released its product at a relatively low price. One of the advantages of a gas unit is the clear and detailed instructions, which greatly simplifies setting up the selected mode.

The company adheres to the same principles in installing an electronic control system and regulating other parameters.

The versatility of a gas boiler can be judged by its operating capabilities:

1. The regulation circuit with a microprocessor chip allows you to both protect and smooth out voltage surges in the power supply network. In case of changes in the current parameters, the electronic system is able to maintain a mode for the full functioning of all components of the unit, which has a positive effect on the operational life of the device. The adjustment circuit also allows you to avoid possible malfunctions due to false activation of sensors. This feature of the electronic system is of particular importance for the operation of the equipment, given the instability of the voltage in the power network and its deviations over a wide range.
2. The design of the gas boiler is designed taking into account a possible drop in water pressure to 0.1 bar. This allows blocking actions and device breakdowns to be reduced to a minimum, which is ideal for its installation on the upper floors of a building.
3. The Navien boiler is capable of neutralizing possible malfunctions caused by a decrease in supply pressure to 4 mbar, which is critical for the normal functioning of many modern systems equipped with electronic control.
4. Thanks to the design features of the Navien gas appliance , the heating system will not freeze even when the gas supply is cut off. To prevent the emergency mode from being activated when the coolant temperature drops below 5 degrees, as well as the inability to ignite the burner, a built-in pump was provided for forced and continuous circulation of water.
5. There is a double heat exchanger for separate heating of hot water and coolant, which is very convenient (you can optionally adjust the preheating of water). Easy-to-use electronics allow you to precisely set the appropriate mode.

Characteristics of Navien Ace ATMO and Navien Ace 20k

The boiler is equipped with uninterruptible voltage.

The company's products include double-circuit boilers with and without turbocharging. The latter belong to the Ace ATMO line. They have the same functions as the turbocharged version. Korean gas boilers Navien Ace reviews are largely positive, which once again indicates the quality of the product.

This unit is equipped with the same chip that ensures uninterrupted operation during power surges as the above-described models. A distinctive feature of the device is the absence of turbocharging, which ensures silent operation.

Navien Ace 20k, like other units of the Korean brand, is fully adapted to the climatic conditions of Russia. The device operates reliably at low gas and water pressure, which allows its use in multi-storey residential buildings. This expands their scope of application. Organizing the removal of combustion products can be carried out in different ways:

• by installing a horizontal (conventional) chimney;
• with a separate smoke removal system;
• by mounting in a vertical position.

It is important to note that some variations of equipment from Navien support remote control using a phone or tablet. is one of the largest Korean equipment manufacturers. Under the NAVIEN brand, gas boilers are supplied to the world market, which are recognized by both specialists and buyers

At the same time, the Korean company is engaged in the production of components for heating systems, as well as related equipment

Under the NAVIEN brand, gas boilers are supplied to the world market, which are recognized by both specialists and buyers. At the same time, the Korean company is engaged in the production of components for heating systems, as well as related equipment

is one of the largest Korean equipment manufacturers. Under the NAVIEN brand, gas boilers are supplied to the world market, which are recognized by both specialists and buyers. At the same time, the Korean company is engaged in the production of components for heating systems, as well as related equipment.

The company's product range is quite wide and includes designs that can provide heat to both small city apartments and large houses. One of the most popular units today is the NAVIEN ACE 24k boiler. This device can rightfully be considered a standard of reliability and excellent build quality. If you are looking for universal heating equipment, choosing this model can be considered more than rational and correct.

Operating principle of the Navien boiler

The operating principles of modern gas boilers are almost the same for all manufacturers, the only differences are in the configuration of the equipment and the internal arrangement of the actuators. The flow diagram of water in the boiler is shown in the figures. The Navien boiler works either to maintain the required temperature in the CO, when heated water from the first heat exchanger is pumped by a circulation pump in a large circle, or in the DHW preparation mode. The DHW mode is a priority, which means that if it is necessary to heat the water, a special three-way valve switches the circulation to the DHW plate heat exchanger, and the coolant flow through the heating circuit is blocked. The signal to switch the boiler to the DHW preparation mode comes from the flow sensor located on the hydraulic unit with the make-up tap.

User manual

Navien gas boilers are operated automatically, with minimal human intervention.

The owner only needs to observe the readings on the display and respond in a timely manner to the appearance of an error code.

In addition, the user determines the operating mode - summer or winter:

• Summer mode is determined only by DHW heating.
• Winter mode starts the heating system simultaneously with the supply of hot water.

The display has a button with a corresponding icon (symbol of a snowflake or sun).

If it is necessary to adjust the extract air temperature or other parameters of the heating system, the winter operating mode must be turned on. Exhaust temperature is adjusted when the radiator icon is flashing.

If it lights up steadily, the display shows the current temperature . By pressing the “radiator” button so that the icon flashes, press the “+” or “-” buttons to change the set coolant temperature.

The icon stops flashing after a while (a few seconds), and the boiler will begin to heat or cool the coolant in accordance with the instructions received.

Setting up a Navien gas boiler

Next, we’ll look at how to set up a Navien Deluxe gas boiler with your own hands. Manipulations are carried out using a remote control with a built-in room temperature sensor.

Heating settings

To set the heating mode and set the coolant temperature, hold down the button with the image of a radiator until the same icon appears on the screen. If the “radiator” picture blinks, it means that the set coolant temperature is displayed on the screen. If the symbol does not flash, the actual water heating level is displayed.

To set the desired temperature, use the “+” and “-” buttons with the “radiator” icon flashing. The possible range is from 40ºC to 80ºC. Once the temperature is set, it will be automatically saved. The “radiator” icon will blink for a few seconds, after which the actual temperature of the coolant will be displayed on the screen.

Heating with air temperature control

To set the desired air temperature in the room, you need to hold down the “radiator” button until the image “house with thermometer” appears on the screen. It means “Heating with room temperature control” mode.

When the “house with thermometer” symbol is flashing, the desired room temperature is displayed on the screen. When the icon is not flashing, the display shows the actual room temperature.

When the icon is flashing, using the “+” and “-” buttons, the desired level of heating in the room is set, adjustable in the range of 10-40ºC. The temperature is then automatically saved and the icon stops flashing.

Setting the hot water temperature

To set the hot water temperature, you need to hold down the “water tap” button until a similar flashing symbol appears in the right corner. You can then set the desired hot water temperature between 30ºC and 60ºC. The settings will be automatically saved and the “water tap” symbol will stop flashing.

Note! In the “Hot water priority” mode, the water heating temperature is regulated differently. Now let's look at how to configure the Navien Deluxe gas boiler in the "Hot water priority" mode

To activate it, hold down the “water tap” key until the “faucet and light” symbol appears on the screen. Now you can set the desired temperature using the “+” and “-” keys. When changing the DHW temperature, the “water tap” icon should flash above the “tap and light” symbol.

Now let’s look at how to configure the Navien Deluxe gas boiler in the “Hot water priority” mode. To activate it, hold down the “water tap” key until the “faucet and light” symbol appears on the screen. Now you can set the desired temperature using the “+” and “-” keys. While the DHW temperature is changing, the “water tap” icon should flash above the “tap and light” symbol.

The “Hot water priority” mode involves preparing a supply of water at a given temperature even if it is not in use. It allows you to supply heated water to the consumer a few seconds earlier.

Away Mode

The “Away” mode means the gas boiler operates only for preparing hot water. To switch the unit to this mode, you need to press the button that shows an arrow and a water tap. The “water tap” symbol that appears on the screen means that the “Away from Home” mode is set. The actual temperature in the room is displayed next to it.

Note! This mode is convenient for use in the warm season, when hot water supply is necessary, but there is no need for heating

Setting the Timer mode

The “Timer” mode is necessary to set the time for stopping the operation of the gas boiler within the range from 0 to 12 hours. The unit will work for half an hour, turning off for the specified interval.

To set the “Timer” mode, hold down the “radiator” button until the “clock” symbol appears. When the icon is flashing, use the “+” and “-” keys to set the interval time. The set value is saved, the “clock” stops blinking, and the display shows the actual air temperature.

Running self-test

The Navien boiler self-diagnosis system operates constantly and does not require a separate startup.

The probability of a failure of one or another node exists at any time, so the sensors send signals about the status of certain elements 24/7, never stopping.

If the sensor stops working for any reason, the corresponding error code immediately lights up on the display. This is an important function that helps maintain performance and timely troubleshooting .

Navien malfunctions

A gas boiler is a structurally simple device, but to ensure safe operation, any such units are equipped with automatic safety equipment, which serves to prevent serious accidents when operating errors occur. Almost all physical processes occurring during the operation of the unit are controlled by various sensors, information from which is sent to the control unit and continuously processed.

For the convenience of diagnosing and troubleshooting, information is provided to the user on the control panel display in the form of codes, which can be used to determine which specific system the malfunction has occurred and what checks can be carried out to eliminate it. Next we will look at the most common errors of Navien boilers in more detail.

Causes of malfunctions and their elimination

To understand how to troubleshoot a particular problem in a gas unit, you need to know the causes of malfunctions:

1. Code 01E indicates an increase in the temperature in the device. This is possible due to blockage in the ducts, which caused them to narrow, or there were problems with the circulation pump.
2. Code 02E indicates the presence of air, insufficient water, damage to the impeller in the circulation pump, a closed distribution valve, or the flow sensor has become unusable.
3. Code 03E is displayed as a result of problems with the ionization sensor, lack of gas supply, lack of ignition, when the tap is closed, or when the boiler is not properly grounded.
4. Code 05E indicates poor contact between the temperature sensor and the controller, or a short circuit in the same area.
5. Code 10E is displayed on the screen if the fan fails, as well as if the sensor tubes are incorrectly connected directly to the fan. In addition, a clogged chimney or a strong gust of wind can also cause the device to malfunction.
6. Code 11E , as a rule, is displayed on European-made boilers (with appropriate sensors).
7. Code 13E indicates a short circuit in the heating water flow meter.
8. Noise and hum may occur if the coolant is poor.
9. The reason for the lack of hot water is the valve , which has become unusable. The optimal valve service life is 4 years.

How to fix:

1. Error 01E: carefully inspect the impeller in the circulation pump to detect various problems; check the resistance in the pump coil itself; examine the heating system for the presence of air (bleed off excess).
2. Error 02E: deflate; check the pressure and resistance in the coil; whether a short circuit has occurred; open the valve (distribution); check the resistance in the flow meter; remove the sensor housing and clean the flag.
3. Error 03E: clean the flame sensor from debris (you can use fine-grained sandpaper to get rid of gray deposits on the electrode).
4. Error 05E: examine the circuit from the controller to the sensor. If there are problems, the sensor should be replaced with a new one. The meter and controller connectors must first be disconnected and then connected.
5. Error 10E: repair the fan or replace it; check the connections on the tubes of the measuring device; Clean the chimney of all kinds of debris.
6. Error 13E: replace the sensor.

You can get rid of noise and hum by disassembling the product and cleaning the heat exchanger. If the problem cannot be solved, the part must be replaced. Inspect the taps; they should be open as much as possible. Reduce water temperature.

Error codes and how to fix them

Let's look at the most common mistakes in the video. For this, many thanks to the Repair-31 channel.

Error 03

Error 02

Error 10

Automated self-diagnosis complexes, in combination with boiler protection systems, prevent the most serious breakdowns almost at the initial stage. When detecting a particular malfunction, the program turns off the boiler and displays a code on the LCD display.

The most common failures of Navien boilers:

• E01 indicates overheating of the coolant in the boiler unit. For atmospheric ATMO models, the electric pump does not function, since in these modifications there is no heating medium flow sensor, so the pump will need to be replaced. You must first check the operation of the heating system for airiness and the presence of contamination in the filter installed in front of the boiler unit.
• E02 indicates a network water circulation error. Error 02 on the Navien boiler is eliminated by checking the circuit for leaks. The pressure in the network is set from 1 to 2 bar; if necessary, the network must be recharged. Check the operation of the shut-off valves and three-way valve; they may be blocked. Check the operation of the flow sensor. If after these procedures the problem is not resolved, the board must be replaced.
• E03 indicates the absence of an electrical signal due to the presence of a flame in the firebox or a break in the primary sensor line. In the Navien boiler, error 03 is checked in the inspection window for the actual presence of a torch. If it is not there, check the electrical resistance of the coils on the gas line cutoff. Monitor the presence of a spark on the electronic ignition system and the gas pressure in front of the boiler unit. The torch may come off due to the large volume of air supplied by the fan.
• E04, false alarm due to flame in the burner. Error 04 on the Navien boiler is possible due to a leak in the gas shut-off valve or a spark from the ignition system is supplied to the flame sensor. The electrode unit will need to be replaced. If the problem persists after this, the board will need to be replaced. You will first need to check the grounding in the boiler with a resistance limit of at least 4 ohms.
• E05, error 05 - there is a break in the return temperature sensor line or its temperature is less than 14 C. Before carrying out repairs, check the humidity at the sensor connection.
• E06, error 06 - short circuit in the return temperature sensor line or its temperature is above 120 C. Check the electrical resistance of the sensor: 20 C - 10.0 kOhm, and 50 C - 3.6 kOhm. If the value is not normal, the sensor will need to be replaced.
• E07, violation in the DHW sensor line. A similar sensor check as above is needed.
• E08, short circuit in the DHW sensor line. A similar sensor check as above is needed.
• E09, error 09 - fan malfunction. You will need to check the incoming voltage on the board in the inclusion zones of the black and red conductors. If the voltage parameters are normal, but the rotation speed is low, less than 420 rpm, it is necessary to replace the electric fan, since ignition will not occur. If the electric fan speed is 2100 rpm. and the failure is not resolved, most likely there is a short circuit in the triac line; the electronic board must be replaced.
• E010, error 10 confirms a failure in the smoke exhaust circuit due to clogged smoke exhaust channels. It is necessary to inspect and clean the chimney, and pay attention to the air intake grille to see if it is clogged with foreign substances.

Recommendations for operation and repair

1. To ensure that the equipment operates for a long time and productively, you can install a voltage stabilizer, filters (gas and water), a magnetic or polyphosphate water converter, etc.
2. The gas boiler must be installed strictly in accordance with the requirements specified in the passport.
3. To eliminate the causes of malfunctions, you must carefully study the instructions and act according to them.

Why does blood pressure drop?

The cause of a drop in water pressure in the system can only be a leak. At the same time, it can be both in the boiler itself and outside it - in pipelines, radiators, etc.

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It is necessary to open the feed valve, start the boiler and carefully inspect the entire system, step by step. If no leaks are found, the boiler must be inspected. When looking for the cause, you should be guided by the rate of pressure drop.

Perhaps the water goes into the expansion tank, in which the membrane has ruptured. Another reason could be a worn safety valve. If it is connected to the sewer, the leakage will not be noticeable.

NOTE! In any case, the drop in pressure indicates that it is going somewhere. It is necessary to find the leak, otherwise it may get wet and destroy the structure of the house.

Reasons for increased pressure

An increase in pressure in the boiler is primarily demonstrated by the safety valve, which begins to release excess pressure. This problem often confuses even experienced specialists.

The reason lies in the secondary heat exchanger. Hot water is heated from the already heated heating agent, receiving energy in a plate secondary heat exchanger. Both liquids exchange thermal energy without mixing with each other.

But, if a fistula occurs, allowing water from the hot water system to penetrate into the heating system, the pressure will increase and tend to balance with the higher pressure of domestic hot water.

If such a problem occurs, the secondary heat exchanger should be replaced, since repairing it is complicated and ineffective.

Power-on problems

There may be several reasons for such a malfunction.:

• There is no voltage in the network (or it has decreased too much, it has become less than 150 V).
• No gas.
• The boiler is blocked by a protection system that was activated due to a critical error (overheating above 98°).

Other reasons for failure may also occur . First of all, you should check the voltage in the network.

The boiler is capable of compensating for fluctuations of up to 30%, but with more significant changes, it simply will not start. You can solve the issue by using a separate outlet and installing a stabilizer.

If all possible causes have been checked and eliminated, but the boiler continues to be silent, you should invite a specialist . Perhaps the cause was a failure of the control unit, a breakdown, or another serious problem.

You should not attempt to resolve the issue yourself; this may cause the final destruction of the unit.

What to do if the aspirated air leaks?

For the Atmo model range with an open (atmospheric) burner, the primary heat exchanger is made of copper.

The appearance of a leak is almost always associated with its destruction. Purchasing a new heat exchanger is not an easy and expensive task, so most often the issue is solved by soldering the fistula .

To carry out repairs, you should contact a technician from the service center, since this requires a qualified specialist who can dismantle the unit, find the fistula that has arisen, solder it properly, simultaneously rinse the heat exchanger and install it in place without damage.

The work is complex and requires the participation of a trained person.

The control board is faulty

This error, which is difficult to accurately diagnose, is designated by code 15E. It is almost impossible to understand how the control board works without special education. The most correct algorithm of action in such a situation is to invite a specialist who can use testing to determine and eliminate the causes of the problem.

The place where the Navien gas boiler is repaired is chosen by the foreman: in particularly difficult cases it is necessary to transport the boiler to a service center. To avoid problems of this type, it is strongly recommended to equip the supply networks of the Navien boiler with a voltage stabilizer.

Review of less common errors

We have listed the error codes that most often bother users. But there are other symbols that indicate irregularities in the operation of Navien gas boilers and potential repairs.

11 – failure in the operating parameters of water level or pressure. This error appears on the displays of boilers with automatic make-up. To fix it, you need to turn off the system, check the operation of the water filling valve, remove any remaining water in the pump drain, reconnect the pump and restart the system. If it doesn’t help, call technical service.

12 – absence of flame. There are many reasons, and we recommend acting as for errors 03-04. First, check if the gas taps are closed, if there is power supply and if everything is in order with the grounding.

15 – problems with the control board. If it does not respond to power supply, it requires repair or replacement.

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16 – overheating of the system, and any of the components can overheat: fan motor, heat exchanger, pump motor. What you can do yourself: clean the filters and heat exchanger, change the thermostat. After a half-hour “rest”, the unit can be restarted - most likely, it will work.

17 – errors related to the DIP switch. You need to correct the control board settings and restart the boiler.

27 – failure of the pressure sensor. If there is no blockage, you need to check the serviceability of the sensor and fan, and then replace the failed part.

30 – overheating of the smoke thermostat. It is necessary to turn off the boiler, allow it to cool for 30 minutes, then restart. If it doesn’t work, check the fan and air pressure sensor, clean the chimney.

93 – the “on/off” button is broken. You should replace it yourself or call a specialist.

Many problems can be solved independently, which is why the manufacturer provides brief instructions on how to resolve emergency situations.

But if it comes to complex repairs or replacements, it is better to have the unit repaired at a service center, with a subsequent guarantee for new spare parts

If an unknown error code appears on the display of a geyser or floor-standing Navien model, you also need to contact specialists.

Navien boiler error 03

In gas boilers, the presence of a flame on the burner is checked by a special sensor - an ionization electrode. The operating logic of the unit is to continuously check for the presence of a flame after opening the gas valve. Symptoms of error 03 on Navien boilers can be divided into two groups:

• unsuccessful attempts to ignite (no flame appears)
• ignition occurs, but the flame goes out

If ignition does not occur, you need to check:

• gas pressure at the inlet and outlet of the gas valve (can only be carried out by a qualified specialist using special equipment - a differential pressure gauge)
• condition of the ignition electrodes (compliance of the gap with the manufacturer’s standard, contamination of the electrodes). The normal distance between the electrodes is 3.5-4.5 mm.
• integrity of the insulation of the electrode power wire (you can visually verify that the spark breakdown occurs specifically on the body of the gas burner, and not somewhere else)
• correct setting of the boiler power on the DIP switch (valid if there is a problem during the first start of the boiler or after replacing the electronic board)
• presence of voltage on the ignition transformer

Error 03
on a Navien boiler will also appear if combustion is unstable (intermittent flame) or if the control unit is unable to detect the presence of a flame. In this case, you need to make sure that the connection between the ionization electrode and the control board is reliable, check that the boiler is grounded and that there is no contamination on the electrode. Unstability of combustion can be caused by an increase in fan speed, so you need to make sure that the yellow hose going from the turbine to the APS sensor is securely connected and not damaged.

If during the checks it was not possible to normalize the operation of the boiler, diagnostics of the boiler board, repair or replacement will most likely be required. We recommend watching a video in which one of the users simulates error 03 on a Navien boiler:

Important nuances during repairs

When repairing a boiler, you need to know how to fill the coolant after draining. Before refilling, turn off the gas and turn off the power to the equipment. It is necessary to check the position of the distribution and shut-off valves and open them as much as possible.

The make-up tap, which is located at the bottom of the device, must be turned to the left. When the pressure gauge mark is 1.2-2 bar, close the tap. If the emergency indicator starts working, you should drain the water and repeat the procedure.

Another boiler malfunction, solution to the problem:

To ensure that the device works for a long time and properly , you can purchase a voltage stabilizer, a water and gas filter, as well as a polyphosphate or magnetic water converter.
We must not forget that installation of equipment must be carried out in accordance with the manufacturer’s requirements. Before fixing the problem, you need to familiarize yourself with the classification of problem codes and see what a specific error may mean. When making repairs, it is important to study the instructions and follow the information provided in it. Navien gas boilers are an excellent option for both a private home and a city apartment. In case of breakdowns, it is very important to diagnose and fix the problem in a timely manner. In case of serious malfunctions, it is best to entrust the work to a specialist.

Technical device and principle of operation of the Navien gas boiler

Let's consider the design of a double-circuit gas boiler Navien Deluxe Coaxial.

Construction of a Navien gas boiler

The device has two heat exchangers that prepare the coolant (primary) and domestic hot water (secondary). Gas supply lines and cold water are connected to the corresponding pipes, which enters the heat exchangers, where they are heated to certain temperatures. Then, using a circulation pump, the coolant is directed to the heating system of the house.

The entire operation of the device is controlled by an electronic unit that ensures timely switching off/on of the burner and controls the water temperature in both circuits using special sensors. The control board is protected from power surges, but in areas with frequent or significant voltage surges it is necessary to use a stabilizer.

Navien boilers have a remote control unit equipped with a display that shows the current mode, temperature, and other operational parameters of the device. In addition, the display shows an error code detected by the control unit in any system of the device.

How to connect and configure

Installing the boiler does not require any specific actions. Floor-standing devices are installed in a specific place, wall-mounted devices are hung on the wall using a standard hanging rail.

The boiler is mounted using damper pads (rubber, foam rubber, etc.) so that noise during operation does not spread throughout the house. Gas and water pipes, the heating system and hot water supply of the house are connected to the corresponding pipes. An air supply and smoke removal system is also connected (depending on the type of construction).

The boiler is adjusted by bringing the gas pressure to the standard value. To do this, turn off the water supply and use the adjusting screw to adjust the minimum and maximum gas pressure corresponding to operation in different modes. After this, resume the water supply. During operation, it is necessary to periodically check the condition of the boiler connections using a soap solution - if they are not tight, bubbles will appear. If noise or other signs of an unplanned change in operating mode occur, turn off the gas supply and check the condition of the equipment.

Brief operating instructions: control and adjustment

All actions with the boiler are carried out using a remote control panel. The water temperature in the heating system is adjusted by pressing the “+” or “-” buttons on the remote control when the “heating” mode is selected, which is indicated by a stylized image of a battery. The display shows the numerical value of the set temperature. It is also possible to set the mode according to the air temperature in the rooms, for which you need to turn on the corresponding symbol on the display (symbol of a house with a thermometer inside). The flashing image shows the desired temperature value, and the constant image shows the actual temperature. Hot water is adjusted in a similar way, you just need to switch the mode.

Common errors and causes of problems

Sometimes the boiler displays a special code on the display, indicating an error in the operation of a system. Let's look at typical errors and codes:

This table shows common errors in Navien boilers

To solve problems that arise, you should eliminate the source of the malfunction yourself or contact a specialist. There are some special requirements that are indicated in the instructions. For example, code 10 - an error in the smoke removal system - can occur when the system is working properly, but there is simply a strong wind outside. In order to avoid errors, you should carefully study the user instructions.

Navien gas boilers are practical and easy-to-use devices, beneficial from an economic point of view, with full functionality and capabilities. At relatively low prices, South Korean equipment is optimally suited for the harsh Russian conditions, allows you to create a comfortable temperature in the house and organize the supply of hot water. Installation, operation, and maintenance of Navien boilers does not cause any difficulties; all actions are described in detail in the attached instructions. Detected malfunctions or problems that arise are promptly eliminated by specialists from service centers.

Rules of operation and timely maintenance

When purchasing a gas unit to heat your apartment or private home, you should remember that modern devices belong to the category of complex, high-tech, full of automation and protective systems. Therefore, in order to extend the life of the boiler and prevent its premature failure, it is necessary to follow certain operating rules.

1. Firstly, this is installation in accordance with established requirements, according to the scheme recommended by the manufacturer, and not based on the advice of a familiar master.
2. Secondly, these are high-quality materials and components: savings at this stage threaten to develop into financial costs for boiler repairs in the future.
3. Thirdly, this is a thorough check of the condition of the sensors, chimney, water/gas supply before starting the boiler. Inspection and cleaning of main components should be done regularly, and not occasionally.

The automation will tell you the probable causes of problems by displaying coded messages on the display. Experience shows that following these recommendations will help avoid possible serious breakdowns and failures, which means that owners will not have to find out what typical malfunctions the Navienace boiler has and what will be required to eliminate them.

Error code instruction

By introducing electronic circuits into the gas boiler control algorithm, manufacturers have made it easier for ordinary users to use the units at home.

Nowadays there is no need to call representatives of the service organization with which an agreement has been concluded for the supply of fuel, inspection and repair of equipment. Errors are displayed on the electronic display in the form of digital symbols, and instructions for correcting them are given in the technical manual.

Sample control panel. In modern electronic models, the display is located on the control panel, and the symbols are clearly visible even in the dark thanks to the bright LED backlighting in red, orange or blue.

Please note: for Navien boilers, information can be displayed in both digital and alphanumeric characters. This means that there is no difference between error “15” and “E15” - it carries the same information. So, let's move on to the symbols, their decoding and instructions for further actions.

02 – violation of coolant circulation

Outwardly, it looks like this: the heating circuit is operating normally, and cold water suddenly starts flowing from the hot water tap. The information screen, however, displays information about heating the water to the desired temperature.

Reasons for error 02:

• circulation pump failure;
• airing one of the circuits;
• the pressure sensor has failed;
• reduction in pressure below working pressure;
• the tap in the coolant distribution area is closed;
• The automation board is broken.

The consequence of any of the listed troubles is the lack of circulation of hot coolant.

As you can see, there are many reasons, and each one will have to be considered. We recommend starting with the simplest actions: check if the valve on the manifold is closed, try to bleed air from the system, equalize the pressure in the network. Check the filters too - circulation may stop due to a simple blockage. In winter, it is quite possible for the pipeline to freeze in an uninsulated section.

If you have a boiler with a closed combustion chamber, code 02 may also appear if the liquid level in the system is insufficient. To eliminate the error, just add water to the circuit

If the problem with the Navien gas boiler is more complex and involves a breakdown of the sensor, pump or automation unit, it is better to contact a service center.

03-04 – ignition is not performed

If the flame does not ignite, a spark does not occur, or the combustion occurs unevenly, “pulsates,” code 03 may appear. Sometimes it looks different: the flame flares up and immediately goes out.

Possible causes of error 03:

• the connection between the control unit and the electrode is broken;
• breakdown of the sensor or electronic board;
• grounding problems.

The Navien boiler safety system works in such a way that it allows the torch to burn only with a stable air supply from the fan. If the air supply is intermittent, the flame may go out automatically.

What to do:

• check if there is a spark;
• make sure that the electrode is connected to the control unit, that is, it responds to ignition;
• diagnose the operation of the fan;
• see if everything is ok with the grounding.

It also happens that the ignition button does not work due to a power outage - check the shield. Worst of all, if the electronic board fails, you will have to replace it.

05-08 – break in temperature sensor

Often the connection between the sensors and the control board is interrupted, and a false suspicion arises that some components in the system have broken down. For example, code 05 indicates that the connection between the control unit and the temperature sensor has been lost.

This occurs for many reasons, including due to condensation humidity on the contacts of the board or the sensor itself, or due to a decrease in the temperature of the coolant to below +14˚С.

To diagnose the performance of parts, we recommend checking the wiring resistance, and if a problem is detected, replace the NTC sensor installed in the heating circuit

Error 06 appears if there is a short circuit in the temperature sensor circuit. For this reason, both the sensor itself and the control board may fail, so diagnostics of all “participants” in the process should be performed.

A similar problem, but in the DHW system, is indicated by the appearance of errors 07-08 on the display.

18-19 – errors in the return temperature sensor, 21-22 – at the service water inlet.

Advice: before replacing sensors or submitting the control board for repair, carefully check all connections - often a failure occurs due to a simple break in the contacts.

09 – fan malfunction

If the fan rotation speed drops sharply, namely, drops to 400 rpm and remains in this state for 3 seconds, the protection system will work and ignition will be impossible. If the low speed continues for 10 seconds, the display will show code 09.

The program is configured so that after half a minute it will start the blowing device again. If the speed returns to normal, the boiler will turn on and operate in the selected mode; if not, the self-diagnosis will be repeated

An indicator of 2 thousand rpm indicates a short circuit. Most likely, the board has failed or the fan has broken as a result.

What to do:

• Wait until the unit restarts and tries to fix the error itself.
• If the restart continues to repeat, you need to check the board, wire contacts, and clarify the alternating current data - from 100 to 220 V.
• With normal current parameters and low performance of the blowing device, fan failure is clearly diagnosed.
• Replace the fan yourself or invite a specialist.

The problem may also be that the output filter is dirty. Check for blockages and clean if necessary. Often after this simple action the boiler starts working like new.

10 – failure in the smoke removal system

Code 10 appears if there is an obstacle to the exit of combustion products from the boiler to the outside. The smoke removal process is regulated by a smoke exhauster, which creates draft.

Possible causes of error 10:

• blockage in the chimney, reduction in the working diameter of the chimney pipe;
• complete lack of traction;
• malfunction of sensors;
• resistance in the chimney caused by strong winds;
• pipe icing.

If the hoses are incorrectly connected to the APS sensor or are kinked, code 10 may also appear.

To normalize the operation of the Navien boiler, you need to clean the chimney, adjust the draft within acceptable limits, and replace failed sensors

The influence of wind on the combustion process can be reduced by installing a cap at the chimney outlet. If all actions do not help, you should call a technician for professional diagnostics, maintenance of the Navien boiler and, possibly, replacement of the control board.

13 – flow sensor is broken

Error 13 indicates a malfunction of the control board, which can cause a short circuit. If after testing the failure is confirmed, the board requires replacement. Sometimes everything is simpler - contacts simply become loose and need to be tightened.

One of the reasons is “sticking” of the flow sensor inside the heating system. To determine it, you need to turn off the unit, ring the lines, and if they ring, check the position of the sensor

To repair or replace, remove the outer panel and look at the position of the flag: when the boiler is turned on, it should be in the lowered state.

If you turn off the circulation pump, code 13 may also appear. As soon as the pump starts working again, the error can be cleared manually by pressing the “Stand-by” button.