Errors of a gas boiler Navien: decryption of the breakdown code and solutions

A gas boiler house in a country house means comfort, warmth, always hot water and saving the family budget on paying for fuel. The main thing is that in the cold season the "heart" of the heating system does not fail - a gas boiler.

Aggregates of the Navien brand have established themselves as powerful conscientious machines that are easy to install and convenient to operate, capable of working for a long time without repair or replacement of spare parts. But even with such reliable assistants, sometimes troubles happen - breakdowns due to wear of parts, improper operation or poor quality of the coolant.

Thanks to self-diagnostics, errors of a Navien gas boiler are immediately displayed, and it becomes clear to homeowners which part of the boiler needs attention. We present an overview of the problems that users of Navien boilers often encounter, as well as tips on how to respond to certain error codes.

Classification of boilers Navien

Gas units of the South Korean brand differ in the place of installation and the principle of operation, respectively, the error codes declared by the manufacturer in the instructions also vary and may change with the advent of new models on the market. Consider current offers.

Models running on gas belong to two types - wall and floor. Wall units, in turn, are divided into two categories: traditional and condensation.

Traditional Series:

• DELUXE
• DELUXE S;
• DELUXE Comfort;
• ACE (atmosphere);
• DELUXE PLUS;
• SMART TOK.

Condensation Series:

• NCB 700;
• NFB-98H;
• NPE;
• NCB 52-H.

Now only 2 series of floor boilers are produced:

• GA;
• GST

All models of this manufacturer have a whole list of advantages that have made the brand popular in Russia. According to surveys of users who have long been using the technique, 4 main advantages can be distinguished:

The assortment is constantly changing: old models are replaced by updated, more advanced ones. Not so long ago, the SMART TOK wall-mounted boiler appeared, which can be controlled directly from a smartphone. In the “smart” series there are 6 options ranging from 13 to 35 kW, and you can choose a comfortable mode right on the way from work home.

Error Code Briefing

By introducing electronic circuits into the gas boiler control algorithm, manufacturers have facilitated the use of units in everyday life by ordinary users.

Now it’s not necessary for each occasion to call the representatives of the service organization with which contract signed for the supply of fuel, inspection and repair of equipment. Errors are displayed on the electronic scoreboard in the form of digital symbols, and instructions for their correction are given in the technical manual.

Sample control panel. For modern electronic models, the display is located on the control panel, and the characters are clearly visible even in the dark thanks to the bright LED illumination of 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 the error "15" and "E15" - it carries the same information. So, we turn to the symbols, their decoding and instructions for further actions.

02 - violation of the circulation of the coolant

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

Causes of error 02:

• breakdown of the circulation pump;
• airing one of the circuits;
• the pressure sensor is out of order;
• lower pressure below the working;
• the tap is shut off in the coolant distribution zone;
• the automation board broke.

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

As you can see, there are many reasons, and each will have to be considered. We recommend starting with the simplest steps: check if the valve on the manifold is closed, try to bleed air from the system, and equalize the pressure in the network. Check and filters - circulation may stop due to commonplace blockage. In winter, icing of the pipeline on an insulated section is quite possible.

If you have a boiler with a closed combustion chamber installed, code 02 may also appear if there is not enough liquid in the system. To eliminate the error, just add water to the circuit

If the malfunction of the gas boiler Navien is more complicated and concerns the 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 combustion occurs unevenly, “pulsates”, code 03 may be displayed. Sometimes it looks different: the flame flashes and then 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 safety system of Navien boilers works in such a way that it allows the torch to burn only with a stable fan air supply. If air is intermittently, the flame may die 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 grounding.

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

05-08 - open temperature sensor

Often, the connection between the sensors and the control board is interrupted, and there is a false suspicion that some nodes in the system have failed. For example, code 05 reports that the connection between the control unit and the temperature sensor has been lost.

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

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 a short circuit occurs in the temperature sensor circuit. For this reason, both the sensor itself and the control board may fail, so you should perform a diagnosis of all the "participants" in the process.

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

18-19 - errors of the temperature sensor on the return, 21-22 - at the entrance of household water.

Tip: Before replacing the sensors or handing over the control board for repair, carefully check all the connections - often the failure occurs due to a simple contact break.

09 - fan malfunctions

If the fan speed drops sharply, namely, it 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 lasts 10 seconds, the code 09 will appear on the display.

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

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

What to do:

• Wait until the unit restarts and tries to fix the error itself.
• If the restart continues to be repeated, it is necessary to check the board, wire contacts, and specify the alternating current data - from 100 to 220 V.
• With normal current parameters and low productivity of the blowing device, a fan breakdown is uniquely diagnosed.
• Replace the fan yourself or invite a specialist.

It could also be a dirty output filter. Check for obstruction and clean if necessary. Often after this simple action, the boiler starts working like a new one.

10 - failure in the smoke exhaust system

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

Possible causes of error 10:

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

If the hoses are incorrectly connected to the APS sensor or bent over, the code 10 may also be displayed.

To normalize the operation of the Navien boiler, it is necessary to clean the chimney, adjust the draft within the permissible limits, replace the failed sensors

The effect of wind on the combustion process can be reduced by installing a hood on the chimney outlet. If any actions do not help, you should call the wizard for professional diagnostics, boiler maintenance Navien and possibly replacing the control board.

13 - the flow sensor has broken

Error 13 reports a malfunction of the control board, which can cause a short circuit. If after testing the failure is confirmed, the board needs to be replaced. Sometimes everything is simpler - contacts that need to be tightened simply weaken.

One of the reasons is the “sticking” of the duct 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 on, it must be in the lowered state.

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

Review of less frequent errors

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

11 - a malfunction in the operating parameters of the water level or pressure. This error appears on the displays of boilers with automatic recharge. To fix it, you need to turn off the system, check the operability of the water filling valve, remove the remaining water in the pump drain, reconnect the pump and restart the system. If it does not help, call the technical service.

12 - lack of flame. There are many reasons, and we recommend that you act as with errors 03-04. First, check that the gas valves are not shut off, that power is supplied and that everything is okay with grounding.

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

16 - overheating of the system, and any of the units may 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 - DIP switch related errors. It is necessary to correct the settings of the control board and restart the boiler.

27 - damage to the pressure sensor. If there is no blockage, you need to check the health 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 does not work, check the fan and air pressure sensor, clean the chimney.

93 - the on / off button has broken. It should be replaced on its own or call a specialist.

Many problems are resolved on their own, so the manufacturer gives brief instructions on resolving emergency situations.

But if it comes to complex repairs or replacements, it is better to repair the unit in a service center, followed by a guarantee for new parts

If an unknown gas column or Navien floor model error code appears on the display, you must also contact a specialist.

Conclusions and useful video on the topic

Decoding error 02:

Error 03 and how to fix it:

How to disassemble the unit and clean the heat exchanger:

The self-diagnosis system of Navien boilers is a loyal assistant even to an inexperienced user who has little understanding of the technical subtleties. Thanks to the error codes, you can quickly deal with the shutdown of the unit, which means that you can keep the house warm.

We recommend that before starting operation, familiarize yourself not only with the design and specifications of the gas boiler, but also with the code table carefully provided by the manufacturer.

Please write comments in the block form below. Share your own experience in identifying boiler errors by decrypting the code and eliminating irregularities. it is possible that your advice will be extremely useful to site visitors.