You can pay only for the consumed resources and control the heating power with an autonomous heating system. Many residents of houses and apartments install boilers from the Korean manufacturer Navien. Despite the quality and duration of operation, even this technique is prone to breakdowns. We will list the errors of the Navien boiler and reveal their meaning. You will learn in which cases you can repair the device yourself, and when it is better to contact the master.
Features of the equipment
Equipment is wall and floor type. The most popular models are Navien Ice, Navien NCN SteelGA/GST, Navien AceTurbo and Ace Atmo, Navien LST. Among all the variety, you will find boilers with atmospheric and turbocharged combustion chambers. There are also condensing units with a built-in heat exchanger to collect condensate. Read more in the article “What is a gas condensing boiler”.
According to the type of operation, the units are divided into double-circuit and single-circuit. Double-circuit are equipped with two heat exchangers for heating water and space heating. All models have a Russified remote control, as well as sensors for monitoring systems.
The control circuit is equipped with a microchip, so the equipment is not afraid of power surges in the network. The design ensures stable operation when the pressure drops to 0,1 bar.
The built-in circulation pump will not allow the coolant to freeze even if the gas is turned off.
The boiler self-diagnosis system allows you to detect a breakdown at an early stage, as well as understand why a problem has occurred, how to fix it. Before proceeding with DIY repairs, make sure that the warranty period has expired. If you open the device, it will become invalid.
Decoding errors
How to troubleshoot? The repair instructions in our table will help.
| Error Codes | Value | Repair by own hands |
| 01E | Overheating of attachments. |
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| 02E | Not enough liquid in the heating circuit, pressure drops. Damaged flow sensor wiring. |
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| Error 03 E | There is no message about the presence of a flame. The device does not start. |
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| 04E | The system reports the presence of a flame, although no fuel is supplied to the burner. | Diagnostics of the flame sensor, its contacts and connections. Connecting a working electronic board. |
| 05E | Malfunctions in the circuit of the heating temperature sensor and the electronic module. | Inspection of wiring, circuit repair, tightening of contacts. |
| 06E | The temperature sensor does not turn on. Short circuit. | |
| 07E/ 08E | Short circuit of the DHW thermistor. | |
| Error 09E | The fan is not working. | It is required to check the motor and fan contacts. Carry out replacement if necessary. |
| Error 10E | Problems with the removal of combustion products. | What to do:
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| 11E | Malfunction of the coolant filling sensor. The code is typical for European-made models. | The reason may be a power surge. If there was no jump, check the DIP switch settings – set the correct ones according to the instructions. If this does not help, contact the service. |
| Error 13E | The flow controller in the heating circuit is out of order. | Adjust the detail settings flag, clear it of blockage. Connect a new element. |
| 12 | Problems with the functioning of gas fittings. |
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| 15 | Equipment failure. | Reloading technology. Checking the connectors and wiring of the control board. |
| Error 16 | The overheat sensor has tripped. | How to fix the problem:
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| 17 | Incorrect connection of DIP switches to the display. | Reconnect. |
| 18 | The smoke removal sensor is overheating. |
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| 27 (for Ice, Ice Coax) | Problems with the air pressure sensor. | Inspection of the sensor, its wiring, circuit, contacts. |
Even if the codes on the display do not appear, and you notice malfunctions, proceed to eliminate them.
Why is the boiler noisy and buzzing
At the same time, hot water does not come out of the tap, or a thin stream flows. The reason is the blockage of the heat exchanger due to poor-quality water.
The water contains potassium and magnesium salts. When heated above 55 degrees, they are deposited on the nodes and parts, the walls of the radiator. The thicker the scale layer, the narrower the passage for water. Therefore, the pressure decreases, and the liquid boils. As a result, there is no hot water, extraneous sounds are heard. Due to poor heat dissipation, heating is often switched on, which leads to high fuel consumption.
How to be:
- Rinse the heat exchanger, clean its tubes. Perform regular maintenance of the unit at least once a year;
- Install a purification filter that will “soften” the water;
- Do not set a high temperature – then the scale will not be deposited.
Heating does not work
If DHW heating is normal, but the heating circuit is not working, check the three-way valve. It switches the heating between the circuits. Perhaps it is jammed, or it is out of order. Carry out a replacement.
Remote control not working
Install new batteries.
Users of Navien boilers most often encounter such problems. If you follow the rules of operation and carry out regular preventive maintenance, you will be able to avoid many problems.
I have a boiler from Navien, a problem arose: when I turn on the shower, the temperature changes by about +- one degree. Can you tell me what the problem is?