Junkers Gas Boiler Error Codes A boiler breakdown at the height of the heating season is a terrible dream for each owner of this equipment, isn’t it? It so happened that the boiler got up, it is cold in the house, and the master can come only in a few days? Such malfunctions of the Junkers gas boiler can cause despair.
Do not rush to panic, because many breakdowns of gas boilers can be eliminated independently without experience and a special tool, and we will teach you this.
In this article, we will not only give decryption to the error codes that the boiler gives, but also associate them with the current state of the unit. We will also tell you how to fix some malfunctions and in which cases you can not do without the help of a specialist.
Junkers Gas Boiler Error Code Solutions
Error A3 – Exhaust gas sensor has an open or short circuit. Check sensor and cable and replace if necessary.
Error A4 – Outlet of exhaust gases through the flue gas box. Check chimney.
Error A7 – Break in the hot water NTC sensor circuit. Check sensor and cable.
AC error – Gap between TA 211E or RAM and control unit. Check cable.
Error b1 – The coding plug is not recognized by the electronic board. Install the plug correctly, replace if necessary.
Error CC – The circuit of the outdoor temperature sensor of the TA 211E unit has a break. Check outdoor sensor and cable.
error d1– No return voltage from LSM 5. Check circuit of LSM 5 flue gas valve.
Error E0 – Internal failure on the electronic board. Replace electronic board.
Error E2 – Break or short circuit in the NTC sensor circuit of the direct pipeline. Check cable and NTC sensor, replace if necessary.
Error E9 – The maximum temperature limiter has tripped. Check the forward flow NTC sensor, the pump, as well as the fuses on the electronic board.
Error EA – No ionization current. Check gas inlet pressure, power supply, ignition electrode with cable, and ionization electrode with cable.
F7 error– Wrong ionization signal. Check the ionization electrode with cable for damage.
Error FA – Ionization current remains after turning off the regulators. Check gas fittings.
Junkers Ceraclass
A7 – Hot water temperature sensor defective.
A9 – The hot water temperature sensor is incorrectly installed.
C4 – The differential pressure switch does not open in the non-working position.
C6 – The differential pressure switch does not close.
SS – Outside temperature sensor not detected.
E2 – The flow temperature sensor is not working.
E9 – The limiter in the supply line has tripped.
EA– No flame detected.
F0 – Internal fault.
F7 – Although the device is turned off, a flame is detected.
FA – A flame has been detected after the gas supply has been turned off.
Junkers Euroline
The Reset key and the 45 degree mode control lamp flash . The temperature limiter is defective. Carry out NTC control of the supply pipeline, pump.
The Reset key and the 60 degree mode indicator light flash . No flame, control time has elapsed (automatic emergency shutdown). Carry out control of ignition, ionization, valves.
Reset key and 75 degree mode indicator light blinking. Incorrect flame signal. Carry out control of ionization, printed circuit board, presence of moisture on the board.
The Reset key and the 45 and 90 degree control lamps flash . Pressure sensor failure, “plug” in the flue gas pipe. Check the pressure box (short circuit, break); pipes for air and flue gases.
The Reset key and the 60 and 90 degree control lamps flash . Heating NTC sensor defective. Carry out NTC control of the supply line (short circuit, break).
The Reset key and the 75 and 90 degree control lamps flash . Damaged DHW NTC sensor (short circuit, break).
Reset key and 90 degree mode indicator light blinking. Temperature limiter malfunction. Check the temperature (it should not exceed 95 degrees).
Malfunctions and repairs
Junkers gas boiler is in operation. During operation, the burner function indicator lights up permanently. Shouldn’t it be like that? Is this an incorrect installation and configuration of the unit itself, or is it a breakdown? If I install a room thermostat, will something change for me?
First of all, the thermostat will prevent excess gas consumption. Namely: Without a thermostat in the system, the burner works almost constantly (just your case), since the boiler tries to maintain the set temperature of the coolant, and not the air in the room. When the thermostat is installed, it starts to work to maintain the microclimate in the room, and accordingly, it works only when the room temperature drops below the set one.
A Junkers 23 wall-mounted boiler has been installed in a private house. The last few days have been severe frosts and yesterday the temperature in the house began to drop in the rooms. And the boiler itself behaved very strangely. It picks up a temperature of 65C (set in the settings), then for some reason resets it a little. Then he turns on the burner and heats up to 72-74C. After that, he turns off the burner, and waits until the water cools down to 30-33 degrees. Wait another 3-4 minutes and turn on the heating again. The unit operates in the mode – the maximum possible modulation (when the coolant temperature is exceeded by 5 C, the burner is turned off, paused and heated again). Tell me what happened?
The sump needs to be checked. If it gets cold in the house, we recommend installing a thermostat or increasing the temperature of the coolant by setting the maximum value.
I need advice on a Junkers 23 gas boiler. I plan to install this bithermic apparatus instead of another double-circuit boiler with a plate heat exchanger. When choosing, I had a number of questions. The manual states that this model cannot be used with battery thermostatic controls. And I have them installed, and connected to the system from one pipe. Will it be possible from use if open the adjusting heads to the maximum value. My heating system is made in such a way that water is constantly pumped through the boiler. This is realized by installing external pumps. It turns out that when I turn on the DHW, part of the heat will still go to the CO?
Could this cause a drop in the set DHW temperature? The instructions state that the priority in the work is given to the hot water supply. And how is it physically implemented in this model? At the moment, I have a BKN with a circulation pump connected to the DHW outlet, which is turned on by a signal from a temperature sensor. If I leave everything unchanged, will the unit be able to work adequately? I want to change the boiler itself, since there is a strong drop in temperature when the hot water supply is turned on, namely heating at the BKN. Electric power is 5 kW,
It will also work, only the burner will give more heat. When implementing priority on DHW, switching to it will always be, regardless of whether the system is in standby mode or heating the heating system.
A few days ago, I finally connected the gas and called a representative of the gas company to start the Junkers Euroline boiler for me. During the adjustment work, he, having measured the grounding, said that it did not correspond to the norm. It seems that I called the values 220/130, but I could be wrong, because I don’t understand much about this. Now, after about 7 hours of operation, the unit gets up by mistake (75 degrees indicator flashes), and it is not possible to start it back into operation.
I hear how the flame lights up, I see that the water temperature begins to rise (by 10-15 degrees), but there is no signal that the flame has flared up. Accordingly, it starts the ignition system three more times, and then again shows error 75. It can only be started after de-energizing it. Gas officials say that only properly made grounding will help. Is this true, or do I need to consider other options for breakdowns?
Most likely, just grounding and nothing to do with it. Their version is logical, but they did not take into account the features of the board. I had the same problem, although there was no ground at all. And I solved this problem, although there was no grounding, and no. I would advise calling a service representative to flash the board (they will immediately understand what it is about). You can try setting the fan to mode 5. This is easily done through me on my
own. The cause of the error is not entirely clear, so the ways to solve it were chosen spontaneously, but they work.
During the operation of the Junkers turbocharged boiler, an EA error constantly occurs, meaning there is no flame. The device worked and turned on without problems and worked all winter almost without comment. The above error appeared only a few times (at a given temperature of 75C). Since it is gradually getting warmer and warmer outside, I changed the boiler settings and set the temperature to 45C. Now the error appears every day, and sometimes 2 times.
Using the selection method, I found out that when the water temperature is set above 50 degrees, the error almost does not appear. And before the error appears, the “flame” icon disappears. The boiler turns on the ignition system, makes five attempts and turns off in an emergency. I remove the error by pressing the OK button, the unit makes 5 more attempts to ignite and does not work again. It only helps to turn it off from the network for 5 seconds. It starts working until the next error.
Pay attention to: Gas pressure. If there are no problems with pressure, try to rearrange the wires of the ionization electrode and the ignition electrode. If the first two points did not help, you will need to change the board. Perhaps a flashing will help. Sometimes reconfiguring the fan mode from 2 to 5 will help to remove this error. I assume that it could not cope with the air supply to the boiler and therefore the flame simply went out. My chimney is 0.7m long. The channel is not narrowed by any gaskets, but there is a narrowing in the knee due to the clamp at the junction.
Mounted Junkers boiler installed. Been in use for a couple of months over the summer. Then the heating had to be turned on. But I can not adjust the temperature of the coolant above 50C. And yet for some reason it does not allow you to enter the service menu. Tried pressing + and – at the same time, but it didn’t work. What should I do?
Try pressing + and – and the cancel arrow and wait.
The double-circuit gas boiler Junkers Euroline 23 broke down. Periodically, it shows error 75. What could it be? In the required volume, the gas mixture is not supplied to the unit. The problem can be solved by increasing the fan speed, minimal gas supply, or flashing (replacing) the control board (least of all).
At the end of 2014, a Junkers wall mounted boiler was installed in our house. After 5 months of operation, the following problem appeared. If the outside temperature is below 0, an error began to appear (the coolant temperature is set to 55C). We set 65 degrees and the error stopped appearing, but it became too hot in the house (I had to open the windows). It turns out that the flame was extinguished, as it was not powerful enough. After the onset of frost to -25C, the device again began to get up by mistake.
At first, at night, error C4, and then, already in the morning, error C6. Called the service department, who said that such problems can occur if it is designed to function in warmer weather conditions (in Europe). And it’s impossible to do it. They suggested trying to remove the gasket in the elbow of the coaxial pipe, so that partially warm air leaves the room. I suspect that this solution will not add anything other than a draft.
Did the repairmen check the differential pressure switch and the fan, because the error codes indicate problems in them? “Freezing Cauldron” – some kind of frivolous conclusion. Error C4 means that the differential pressure switch does not open, while the fan is running. Error C6 says that the differential pressure switch does not close. It is important to check the fan itself, the wire with the plug suitable for it and, if necessary, replace it. And also diagnose the differential pressure switch itself and the smoke exhaust pipes. Check also correct fan stage settings.
If everything is in order with the differential relay, then there is a possibility of condensation in the chimney. Try to remove it. Still, as an option, you can increase the temperature of the coolant to 75C and include a simple thermostat in the system (on / off relay). You can also remove the jumper on the differential relay control unit and replace it with a thermostat. You should be able to do it.
After setting up and adjusting this boiler model, I still have unresolved issues. During commissioning, the master did not check the pressure on the nozzle and did not adjust it. As a result, I had a question: if I reduce the boiler power in the parameters, do I influence the pressure in the nozzles. Does the device come from the factory with standard (table) settings? Or is the pressure set individually for each particular house?
When you reduce power, you thereby reduce the pressure on the injectors. But such manipulations must be monitored with a pressure gauge. At the factory, the unit is set to a standard pressure of 13 Mbar. If you have more power, then the pressure should be higher. Verification during installation is required.
After replacing the control board on the Junkers gas wall-mounted boiler, after turning it on, it began to give an error “P” (the type of boiler was not determined). To solve this problem, I used the 3.1a function. with its settings, it was necessary to select one of the values: 0, 20, 21, 30, 31, 32, 40, 41, 42, 50, 51, 52. Tell me, which one corresponds exactly to my type?