Navien boilers are widely known in the heating equipment market.
There are several reasons for this: versatility (they can be installed in a private house or apartment, as well as in non-residential premises), quality, automation of the boiler operation process and, at the same time, an affordable price. But any equipment can sometimes fail. And the fault here is not at all in the quality of the boiler itself. Is your Navien boiler showing an error on the display? Often problems are associated with incorrect installation, irregularities during operation, lack of service or its low level and other factors. Therefore, Navien boiler errors may appear on the screen periodically.
The main thing is to know what the error codes of Navien boilers mean in order to assess the situation and find a solution to the problem. Read the error codes of Navien boilers, the reasons for their occurrence and possible solutions from specialists below.
Error 02
Error 02 indicates that the Navien boiler has a low coolant level. Or there is a problem with the flow sensor. As a rule, when the Navien boiler gives error 02, boiling water comes out of the hot water tap for the first seconds, and then cold water. That is, the water temperature suddenly becomes maximum and also drops sharply.
How to fix error 02
1. Adjust the pressure in the heating system. 2. If there is excess air, bleed it through a special valve. 3. If the problem occurs due to a closed distribution valve, open it. 4. Check the functionality of the flow sensor.
Error 09
Error 09 of the Navien boiler notifies about problems (failures) in the operation of the fan. The fan motor may be faulty. Another reason is a malfunction of the control board.
How to resolve error 09
1. Check the fan motor for short circuit or open circuit. 2. If necessary, replace the fan. 3. If the problem is a control board failure, try restarting the boiler. If it doesn't help, change the board. 4. Check the voltage in the fan motor. And the voltage in the electrical network. If it is higher than normal, use a voltage stabilizer
Error codes, interpretation and corrective measures
Regardless of the model, there is a minimum package of typical unit components, the failure of which causes an accident in the system. The thermal circuit components must operate properly for the period specified by the manufacturer. Their early failure may be caused by improper operation or exposure to external conditions. Repairing such equipment is a complex and expensive operation that requires experience and knowledge. However, if all operating requirements are met, then the appearance of emergency codes on the operating panel will be an extremely rare occurrence.
Baxi boiler
Baxi
| Code, E | Baxi boiler, errors and fixes |
| 01 | The boiler does not ignite, low gas pressure: • Broken line of the ignition unit; • the gas valve does not work; • the control board is not working. |
| 02 | The thermostat triggered due to overheating of the coolant: • Lack of water circulation in the heating circuit, due to a non-working pump or a clogged pipe part of the boiler; • the thermostat does not function; • the thermostat communication line is broken; • the temperature sensor in the supply network is not functioning; • the electronic board is not functioning. |
| 03 | Error 03 means that the draft sensor has triggered due to low pressure - the gas ducts are clogged with soot, the control board is not working. |
| 04 | Torch separation on the burner, high air pressure, low pressure in the gas line, control board does not work. |
| 05 | If the boiler generates this error, then the temperature sensor of the supply coolant is not working, there is a break or short circuit in the circuit. |
| 06 | The DHW temperature sensor does not work; there is a break or short circuit in the circuit. |
| 07 | The flue gas temperature sensor does not work; there is a break or short circuit in the circuit. |
| 08 | There is an error in the ignition circuit, there is no ground on the control board or it is not functioning. |
| 09 | Emergency gas protection error - the gas valve board does not function, the valve connection diagram is broken. |
| 10 | There is no signal from the water pressure sensor in the circuit, less than 0.5 bar - the sensor is not functioning or the line to the sensor is broken. |
Electrolux boiler
Electrolux
| Code, E | Fault type |
| 01 | Error e01 means that there is no torch on the burner - low fuel pressure in the line, the electrode is faulty, the gas pipeline is airy. Corrective measures: • Fully open the operating valve on the gas pipeline in front of the boiler; • update the mode with the “RESET” button. If the torch does not burn stably, contact the service center; • to release air from the main gas pipeline, you will need to invite a gas service specialist; • check the functionality of the ignition electrode; if a displacement is detected, it is installed at the workplace and ignition is repeated; if the surfaces are clogged with soot, clean it; • check the integrity of the sensor electrical circuit and carry out diagnostics of the gas shut-off valve. |
| 02 | Overheating of the supply coolant. Possible causes of failure: • The valve on the heating circuit is closed; • airing of the system; • temperature sensor malfunction; • low pressure in the line; • the circulation pump does not work. Elimination algorithm: • Open the valve on the network line; • open the vents and release air; • restart the boiler unit; • ring the line from the temperature sensor to the control unit; • clean contacts; • replace with a working sensor; • fill the system with water to a pressure of 1-1.5 Bar; • check the operation of the pump and the electrical line; • at low voltage parameters, install a stabilizer. |
| 03 | Emergency stop of the boiler to protect against low vacuum. Possible reasons: • The flue is clogged with soot; • oxidation of the contact group of the traction sensor; • the control board has failed; • there is no ventilation in the room; • incorrect installation of the smoke exhauster; • incorrect calculation of the cross-section of smoke exhaust ducts. Correction algorithm: • Check the gas duct and, if necessary, clean the internal surface; • for coaxial smoke exhaust, check internal surfaces for icing; • check the contact group and clean it; • check the board, if there are doubts about its functionality, then send it to the service department for repair; • check the combustion chamber and chimneys, if the room is well ventilated. |
| 04 | There is no passage of coolant, the pressure in the heating circuit is less than 1 Bar. Possible reasons: • The internal heating surfaces of the heat exchanger are clogged with scale; • The radiator is corroded and leaking. Failure correction algorithm: • Perform a restart; if the error recurs, then perform a complete emergency stop of the boiler in accordance with the factory instructions; • carry out cleaning of internal heating surfaces according to factory schedules and using methods and reagents permitted by the boiler manufacturer. |
| 05 | High pressure in the boiler, more than 2.5 Bar. Possible reasons: • non-functioning safety valve; • incorrect operation of the pressure sensor; • faulty control board; • no grounding; • the communication line is broken. It is recommended to perform an external inspection of the sensor, clean the filter; if the sensor is closed, completely replace the sensor. |
| 06 | The supply temperature sensor does not work. Possible reasons: • Inoperative temperature sensor; • unsatisfactory operation of the temperature sensor; • control board failure; • no grounding; • the communication line is broken. The sensor is diagnosed by service technicians. |
| 08 | Malfunction of the sensor on the hot water line, fixing T below +2 C. To prevent freezing of the heating system and boiler installation, install T control outside. Possible reasons: • Inoperative T sensor; • unsatisfactory operation of the T sensor; • control board failure; • no grounding; • the communication line is broken. The sensor is diagnosed by service specialists. |
| 10 | Error e10 causes an emergency stop of the boiler to protect the room from gas contamination. Check the presence of draft in the boiler; if not, check the flue for contamination of the pipes and flues with soot deposits, and clean if necessary. |
Immergas boiler
Immergas
| Code | Fault type |
| 01 | Ignition does not work, the boiler does not start, the boiler operation is blocked. The burner should turn on automatically; if the process does not start after 10 seconds, remove the lock using the “Reset” key. This failure sometimes appears after the boiler unit has been idle. To eliminate the failure, turn on the circulation of the heating network, bleed air through the vents and re-ignite the boiler. |
| 02 | Overheating of the coolant, emergency stop of the boiler, based on a signal from the thermostat. To eliminate the malfunction, cool the boiler through circulation in the heating circuit and reboot it. Carry out diagnostics: • thermostat; • flame sensor; • control boards; • grounding; • integrity of the communication line. |
| 03 | There is no vacuum in the boiler, low draft pressure. Check the flue gas sensor, the operation of the fan and smoke exhauster, and the permeability of the internal cross-section of the flue ducts. Clean the internal surfaces of the smoke duct, including the smoke exhauster blades. |
| 04 | High resistance of the contact group of the pressure sensor and thermostat. They close the contact groups; if there is no result, you need to contact specialists and take the electronic board to a service center for diagnostics. |
| 05 | The NTC temperature sensor in the heating circuit does not work: • Inoperative temperature sensor; • incorrect operation of the temperature sensor; • faulty control board; • no grounding; • the communication line is broken. The sensor is diagnosed by service specialists. |
| 06 | The NTC thermistor for the DHW circuit does not work. |
| 08 | The unlock key is jammed, check and clean the contacts; if the circuit does not work, call a service technician to replace the part and set up the program. |
| 09 | Setup mode is enabled. If the operating conditions of the boiler do not require it, the parameter is disabled. |
| 10 | Low water pressure in the heating circuit is below 0.9 Bar. Troubleshooting algorithm: • Perform an external inspection of the boiler and heating circuit to ensure there are no leaks; • if leaks are detected, they are eliminated; • replenish the circuit to operating pressure; • adjust the speed of the pump until the pressure on the pressure gauge is stable at 1.3 Bar. |
| 11 | The boiler is switched off to protect the smoke sensor due to low draft in the boiler unit. The boiler automatically restarts, and after 3 unsuccessful codes the red emergency indicator lights up. Check for the presence of draft; if it is absent, clean the smoke removal systems. If traction is present, send the sensor for repair or replacement to a service center. |
Navien boiler
Navien
| Code | Gas boiler Navien, causes of error |
| 02 | The volume of heating water in the heating circuit is low or the pressure sensor circuit is broken. |
| 03 | The torch on the burner is broken or the flame sensor circuit is broken. |
| 04 | Incorrect signal indicating the presence of a torch in the burner device or a short circuit in the circuit along the torch. |
| 05 | Lost connection with the heating circuit temperature sensor. |
| 06 | Short circuit in the heating circuit temperature sensor line. |
| 07 | Lost connection with the temperature sensor of the DHW circuit. |
| 08 | Short circuit on the DHW temperature sensor line. |
| 09 | This Navien boiler error is caused by a malfunction of the fan. |
| 10 | The smoke removal system is not working. |
| 13 | Short circuit in the heating circuit pressure sensor line. |
Ariston boiler
Ariston
| 501 | There is no ignition. Failure correction algorithm: • open the gas valve in front of the burner; • check the ion sensor; • clean the contact group of the sensor from oxidation; • tighten the electrode connections. A similar error error f28 exists for Vaillant boilers |
| 607 | The contact group of the fan relay does not work; it will need to be replaced with a new relay. |
| 101 | Automatic shutdown of the boiler to protect against overheating of the coolant. Possible reasons: gas valve clogged, valve cutoff due to high pressure, circuit pump stops, heat exchanger clogged with scale. |
| 102 | The NTC thermistor of the heating system does not work. It is necessary to diagnose the thermistor, check for a short circuit or open circuit. Most likely, the module will need to be replaced. |
| 103-107 | Overheating due to low coolant circulation in the circuit. Check the operation of the pump, the absence of leaks and remove air from the system. |
Error 10
Error 10 of the Navien boiler indicates a malfunction of the smoke removal system. It may be a clogged chimney, a bend in the tubes from the air pressure sensor, or an incorrect connection. Another possible reason for this error to appear is strong gusts of wind.
How to resolve error 10
1. Check, repair or replace the fan. 2. Check and clean the chimney, if necessary. 3. Check how the tubes from the air sensor are connected. Avoid any kinks.
Error 16
The Navien boiler issues error 16 when the heating equipment overheats. The sensor is triggered by overheating and blocks the operation of the boiler. The problem may be a malfunction of the sensor itself.
How to resolve error 16
1. Allow the boiler to cool down and restart it. 2. If the problem is a lack of water in the heating system, add it. 3. If the sensor itself is faulty, replace it. 4. Check the operation of the three-way valve. In case of malfunction, replace the tap. 5. Restart the boiler. It might be the control board. It may be necessary to replace the board.
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 27
Error 27 informs about an open or short circuit in the APS air pressure sensor circuit.
How to resolve error 27
1. Check the APS air pressure sensor.
If a circuit fault is detected, replace the APS sensor. 2. If there is no commutation between the APS sensor contacts and the control unit connector, disconnect the APS sensor connector from the control unit connector connector, and then connect them again for normal contact. 3. If the control board is faulty or does not work correctly, restart the boiler; if it fails again, replace the control board. Now you know the error codes that a navien boiler can produce. Contact us for high-quality repairs of your Navien boiler.
Malfunctions of the Navien gas boiler
In order for you to be able to repair Navien gas boilers yourself, we have compiled this guide. It will provide invaluable assistance in eliminating breakdowns and failures. Let's see what self-diagnosis systems can tell us - let's present the error codes of the Navien boiler in the form of a list:
Despite the huge number of possible breakdowns, most of them do not pose a serious problem and can be solved quite quickly and with little cost.
- 01E – overheating occurred in the equipment, as evidenced by the temperature sensor;
- 02E – in Navien boilers, error 02 indicates a break in the flow sensor circuit and a decrease in the coolant level in the circuit;
- Error 03 in Navien boilers indicates the absence of a signal about the occurrence of a flame. Moreover, the flame can burn;
- 04E - this code is the opposite of the previous one, as it indicates the presence of a flame in its absence, as well as a short circuit in the flame sensor circuit;
- 05E - an error occurs when there is a malfunction in the circuit for measuring the temperature of the coolant in the heating circuit;
- 06E – another temperature sensor failure code, indicating a short circuit in its circuit;
- 07E - this error occurs when there is a malfunction in the temperature sensor circuit in the DHW circuit;
- 08E – error of the same sensor, but diagnosing a short circuit in its circuit;
- 09E - error 09 in Navien boilers indicates improper functioning of the fan;
- 10E – error 10 indicates problems with smoke removal;
- 12E – the flame in the burner went out;
- 13E – error 13 indicates a short circuit in the heating circuit flow sensor;
- 14E – code for lack of gas supply from the main;
- 15E is a rather ambiguous error, indicating problems with the control board, but without a specific indication of the faulty node;
- 16E - error 16 in Navien boilers occurs when the equipment overheats;
- 18E – problems with the smoke exhaust system sensor (sensor overheating);
- 27E – the electronics have detected errors in the air pressure sensor (APS).
