Navien boiler malfunctions: repair instructions for a gas boiler, if it does not turn on, errors, does not start, buzzes when turned on, eliminating heating boiler errors

Self-diagnosis system

The purpose of automatic self-diagnosis and protection systems is to detect and correct various breakdowns at the moment they occur. After fixing any kind of defects, the equipment stops, with a breakdown code displayed on indicators or LCD screens. Finding problems in equipment that is not equipped with self-diagnosis is much more difficult, although the procedure for checking the internal filling does not change. Self-diagnosis allows you to quickly identify and find faults in the Navien boiler.

During the search process, the system sends requests to numerous sensors and nodes: all received results are analyzed and stored. If serious breakdowns are detected, a report about them is instantly transmitted to the indicator board. Initially, such systems were developed for gas workers, since they make it much easier to troubleshoot a Navien gas boiler and fix them. However, if you have minimal skills in servicing boiler equipment, you can repair Navien appliances on your own. Before you begin self-repair, you need to check whether the warranty period has expired. If the warranty is still valid, it is better to send the boiler to a service center for a free repair.

What malfunctions occur

To repair the Navien heating boiler yourself, you need to read the special manual. It will help not only decipher the type of breakdown, but also eliminate it in the most effective way.

List of problem codes with the Navien boiler and their interpretation:

01E. The device overheated, and this was recorded by the temperature sensor.
02E. Indication of an open circuit in the flow sensor and a drop in the coolant level in the circuit.
03E. The signal confirming the presence of a flame has disappeared. In this case, the combustion can continue.
04E. This code has the complete opposite meaning of the previous designation: in this case, there is confirmation of the flame, although in fact it is absent. E
05E. Failure of the circuit responsible for controlling the degree of heating of the coolant in the heating system.
06E. This code also indicates a malfunction of the temperature sensor (the circuit is closed).
07E. Signal about failure of the temperature sensor in the DHW circuit.
08E. Malfunction of the Navien gas boiler in the same unit due to a short circuit.
09E. Alert about fan failure.
10E. The appearance of malfunctions in the smoke removal system.
12E. Flame extinguishment in the burner.
13E. The heating circuit flow sensor has shorted.
14E. Gas has stopped flowing from the main line, which is why the Navien boiler does not turn on.
15E. A general indication of errors in the operation of the control board, without specifying the problematic element.
16E. The equipment has overheated.
18E. Malfunctions in the operation of the smoke exhaust sensor.
27E. Air pressure sensor (APS) malfunctions.

The manufacturer itself does not provide any instructions for repairing the Navien gas boiler. The calculation is made that repair activities are the responsibility of service centers exclusively. In our country, people’s thinking is somewhat different, so many of them are accustomed to troubleshooting household appliances on their own.

Troubleshooting codes

Users can fix many Navien errors on their own.

Repair instructions for Navien gas boiler:

Code “01” is an internal blockage of the heating circuit passage. The most accessible way to eliminate it is to bleed accumulated air from the pipes. Then perform a visual check of the impeller pump and measure the resistance of the motor winding.
At “02”, the circulation system of the DHW circuit is tested, the condition of the shut-off valves is monitored, and the network is fed to operating pressure.
With code “03”, you need to make sure that the gas operating parameters are present in the line, check the surface of the ionization sensor and clean it if it is dirty. Check the distance between the piezo ignition electrodes 3.5-4.5 mm and adjust the unit on the DIP switch.
To eliminate the “05” encoding, clean the contacts and also try connecting/disconnecting the sensor several times.
For code “10” it is necessary to repair or replace the blowing device of the Navien boiler and clean the chimney. They also check the correct connection of the tubes from the sensor to the suction pipe of the smoke exhauster and the presence of kinks in them.

No need to heat

The first step is to clean the heat exchanger. At home, it is common to use citric acid, toilet bowl cleaners and special liquids (if available). Before cleaning the Navien gas boiler, you need to dismantle the heat exchanger and pour a suitable solution into it. After a short pause, it is washed out with high pressure of water.

A similar procedure should be carried out with the DHW circuit heat exchanger if problems are observed with heating hot water. In case of particularly contamination, it is easier to install a new exchanger. To prevent scale build-up, it is recommended to have a system for cleaning and softening your tap water.

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.

Navien wall-mounted gas boilers - model range, pros and cons

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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.

Troubleshooting error 03

There were some obstacles in the way of the signal about the presence of flame entering the system. The cause of this malfunction of the Navien boiler may be a cessation of gas supply or a failure of the flame presence sensor in the burner. Often, problems of this type arise after repairs to a gas pipeline. Error 03 is also displayed when problems occur with ignition.

Elimination procedure:

Checking the gas supply.
Testing the serviceability of ignition.
Cleaning the ionization sensor (it often gets dirty).

When using liquefied gas, you must ensure that the gearbox is in good working order. If the boiler is fully operational, the cause of error 03 may be improper grounding.

Error classification

Automation registers all problems in the heating system. Each error has a code that is shown on the display. List of the most common faults:

01. Overheating has occurred. This could happen due to difficulties with the circulation pump or due to blockage (narrowing of the passage channel).
02. Lack of coolant, breakdown of measuring equipment. In the first option, the system is airy, perhaps the distribution valve is closed or there are problems with the flow sensor.
03. No flame signal, difficulty with the burner. This code appears if gas is not supplied, the ignition does not work, the ionization sensor does not function, the gas tap is closed, and also if the grounding is incorrect.
04. A false fire signal has passed or a short circuit has occurred in the sensor circuit.
05−08. The circuit in the temperature recorder is broken. The contact between the controller and the sensor may be damaged or there may be a short circuit in this area.
09. Fan malfunction.
10. The appearance of smoke. This code appears due to a broken fan or lack of contact between the fan and the sensor. In addition, the cause of the problem may be a clogged chimney or wind entering the chimney.
12. The fire in the combustion department has gone out.
13. There is a short circuit in the flow indicator.
14. No gas supply.
15. Control board malfunction.
16. The equipment has overheated.
17. Error related to DIP switch.
18. The smoke removal unit has overheated.
27. Malfunction of the air pressure device.

If noise is heard when the boiler is operating, and the error code does not appear on the screen, most likely the reason is the formation of scale, which does not allow the coolant flow to function normally. The boiler may also make noise when the device overheats, low-quality coolant is installed, or when water boils.

Another common problem with double-circuit wall-mounted boilers is the breakdown of the three-way valve.

This can happen after the crane’s service life has expired (most often after 4 years). In such a situation, there may be no hot water in the DHW circuit.

Typical Navien Ice boiler breakdowns

Although the devices in this series are famous for their impeccable performance, they sometimes fail. When installing a Navien Ice boiler in your home, it is recommended to arm yourself with information about its most typical faults (there are not very many of them). For example, for the 24 K model, the most typical error is 10. The design of this double-circuit boiler uses a closed combustion chamber, which leads to periodic problems with smoke removal. Most often this happens due to fan breakdowns, which need to be replaced from time to time.

Typical malfunctions of the Navien gas boiler also include error 02: it indicates rapid heating and equally rapid cooling of the boiler. This usually occurs due to the appearance of air pockets in the circuit system or due to a breakdown of the flow sensor. All air must be bled from the heating circuit.

Eliminating common errors

Let's look at the common errors of Navien boilers and figure out how to fix them.

Error “02” - stop coolant circulation

The filters of the boiler or heating system often become clogged, this leads to the appearance of two unfortunate numbers of fault 02. It is also very likely that the cause of this error is the main heat exchanger clogged with scale. These troubles occur due to the high hardness of the water used to operate the device. The ubiquitous scale affects the most important parts of the device, stopping operation. To resume boiler operation, you must:

Clean the filters in the boiler itself and the heating system.
Remove the heat exchanger from the housing.
Prepare an acid solution to destroy scale on the heat exchanger.
Place the heat exchanger in a container with an acid solution.
Wait for the chemistry to do its job.

After simple manipulations, if you have the necessary ingredients and knowledge, you can independently get rid of error “02” of the Navien gas boiler. Monitor the circulation sensor inside the boiler, wash the filters regularly to avoid unpleasant surprises.

Error "03" ignition problems

It says either a simple lack of gas or a broken gas valve. Let's look at the second option. Navien boilers are equipped with the most reliable Japanese gas valves; they are difficult to break when using the boiler perfectly and correctly. But if the mains voltage is ten to twenty volts higher than 220 volts, the coils inside the boiler will turn black and the valve may break completely. To fix this breakdown, you will have to buy a completely new valve and replace the broken part. Extreme care is required with the network voltage. Increased levels can harm more than one boiler.

Error “16” overheating of the main heat exchanger

Occurs when the boiler’s internal thermometer records a temperature of 95 degrees. This Navien boiler error may indicate several breakdowns of the boiler system. Again, the main heat exchanger is clogged with scale due to hard water from the centralized water supply, which causes the device to heat up to a high temperature. Or it could be an insulation problem with the main heat exchanger. The fact is that if you actively use the boiler for five years and do not provide proper care, it is likely that the gaskets, which should not release the heat of the heat exchanger, begin to blow out. Warm air blows directly onto the thermometer - an error occurs. To eliminate error “16” you need to clean the main heat exchanger in an acid solution and restore its insulation. But it is better to prevent this problem by regularly carrying out boiler maintenance; if possible, then using water that is safer for equipment.

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.

Error 01

There is no need to panic, because this code quite often indicates the appearance of ordinary air pockets in the circuit or filter. The procedure for bleeding air from a Navien boiler is carried out according to standard recommendations. Next, you need to check the functionality of the circulation pump.

It is important that it rotates and that the coolant flows well through the impeller. It happens that the reason that the Navien boiler does not start is a physical breakdown of the impeller. A more complex option is problems with the circulation pump, the elimination of which requires rewinding or complete replacement of the equipment. The most reliable model of pumping apparatus is considered to be products from the Grundfos brand.

Error 04

A little about fault 02 has already been said: it consists of a rapid rise in temperature and an equally rapid drop. The same applies to error 03. When the self-diagnosis system detects error 04, the functionality of the flame sensor and its power supply is checked. It is strongly recommended to avoid any contact of this assembly with surrounding metal elements. It happens that this code is displayed when the system board breaks down. In such cases, it is either repaired or replaced.

Errors 07 and 08

The purpose of double-circuit boilers is to provide homes with both heat and hot water. They consist of two circuits and a set of sensors. As a consequence, in this case there is not one temperature sensor, but two. One is designed to control the temperature of the heating circuit, and the second monitors the degree of heating of hot water. The appearance of codes 07 and 08 on the monitor indicates that the hot water in the Navien boiler does not turn on. Diagnosis and elimination occur in the same order as in the previous case.

Error 09

These fault codes are the most common. They signal that the fan has reduced its efficiency or has stopped. To accurately determine the cause, the integrity of its windings and the continuity of their resistance are checked. It is also necessary to make sure that there is an interturn short circuit. If the damage is serious, it is better to change the device. If no problems were found on the fan, you should ring the control board. This procedure will require certain skills: if they are absent, it is better to seek help from specialists from the service center.

Error 10

An indication that problems have arisen with the removal of combustion products. A potential cause is a broken fan. The condition of the chimney duct, which requires regular cleaning, deserves a separate check. It is very important that its length complies with regulatory standards. Quite often, the cause of error 10 lies in a malfunction of the air pressure sensor. The most undesirable situation is regular malfunctions of the Navien boiler board. You need to check the most harmless option, when the wind simply gets into the chimney. Naturally, you need to know what to do if the boiler blows out in a strong wind, and how to get rid of this problem.

Common Mistakes

Navien equipment has excellent build quality, but any equipment can fail. For convenience, each fault has its own special code, which is displayed on the device screen. Error classification:

E01. Overheating of the device due to an increase in temperature level.
E02. There is too little fuel in the system, and the device circuit may also break.
E03. No flame alert.
E04. Incorrect signal about the presence of fire or a short circuit in the sensor circuit.
E05. The circuit in the water temperature indicator is broken.
E06. A short circuit has occurred in the temperature sensor.
E07. Circuit breakage in the water temperature sensor.

See also: decoding and eliminating errors 03, 09 and 27 on the Navien boiler.

Frequent errors on a Navien gas boiler:

E08. Circuit failure in the hot water temperature sensor.
E09. Problems with the fan.
E10. Difficulty removing smoke.
E12. The fire went out during operation.
E13. Short circuit in the flow indicator.
E14. No gas supply.
E15. Damage to the control board.
E16. Device overheating.
E17. DIP switch malfunction.
E18. Smoke exhaust sensor overheating.
E27. Problems with the air pressure sensor.

When no error codes appear on the display, but the device hums or makes noise, it means that scale has formed, which prevents water from passing normally through the pipes.

If water does not flow, the 3-way valve must be replaced.

Gas boiler Navien Ace 35k error 02:

Troubleshooting

In many cases, you can repair the Navien mounted boiler yourself, for example, when code 02 appears on the control display. This problem is one of the most common. List of what to do in case of error 02 on the Navien boiler:

Bleed the equipment.
Measure the pressure level.
Make sure there is no short circuit.
See what position the distribution valve is in. If it is closed, you need to open it. Oddly enough, this very banal problem happens quite often.
Clear the sensor flag.

Code 03 is most often triggered if the flame sensor is dirty. It should be cleaned with fine-grained sandpaper. In case of problem 05, it is necessary to diagnose the condition of the circuit between the controller and the sensor. In case of serious damage, the sensor should be replaced.

Navien boiler error 03: When error 09 appears on the Navien boiler, it means a fan failure. If the code is displayed, but this part is intact and in good working order, you need to check the condition of the control board. This may require calling a specialist, but with certain knowledge you can carry out this procedure yourself.

A similar malfunction is error 10 on the Navien gas boiler. To fix it, you need to check the condition of the fan and, if necessary, replace this part. In addition, it may be necessary to check the contacts in the pipes of the measuring device and clean the chimney.

If error 13 on the Navien boiler, you need to change the sensor. Sometimes the operating noise of equipment may disappear after washing the equipment, but this method does not always work. To drain, you need to open the taps as much as possible and reduce the fuel temperature.

Disassembling the Navien boiler and cleaning the heat exchanger: Code 18 indicates that the temperature sensor in the smoke system has overheated. You should check the quality of passage in the chimney, as well as the connecting circuits and the sensor itself. You need to make sure that there is no backdraft. In addition, the control board may fail, but such situations occur extremely rarely.

Another error with code 27 indicates a breakdown of the air pressure sensor. The condition of all connecting wires should be checked. In case of serious problems, the sensor must be replaced.

Error 16

This code indicates that the heating equipment has overheated: in such cases, the Navien boiler hums when hot water is turned on.

Potentially possible reasons:

Exceeding the coolant heating norm.
Lack of fluid in the circuit.
The control board has malfunctioned.
The three-way valve is acting up.
The DHW temperature sensor has failed.
The gas supply rate has been exceeded. This reason why the Navien boiler is humming is quite rare. Its elimination is carried out by simply screwing on the valve.

Error interpretation

Fault code 13 is indicated in the instructions for Navien Ace series boilers. Minimum information: the reason is in the heating circuit flow sensor. Error 13 is generated in the electronic board when there is no signal from it about normal coolant circulation. Knowing this, it is easy to decide on further actions.

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Where to begin

Restart the Navien boiler using the power switch on the remote control. Korean heating technology is famous for its resistance to voltage instability, but if its value deviates greatly from the nominal value, a false error may occur.

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If this fails to eliminate the 13th fault code, the reason is in the Navien boiler.

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