The Junkers boiler is prone to malfunctions in the same way as other equipment. The manufacturer has simplified the search for the cause of the problem by developing a self-diagnosis system. Any malfunction is indicated on the display by an error code. You just have to find out the meaning of the code, and then either repair the equipment or call the master to the house.
Boilers of the Junkers trademark are presented in two versions: classic and condensing.
A series of classic units include Ceraclass Comfort, Ceraclass Excellence, Junkers Euroline (Euroline). These are single-circuit and double-circuit models mounted on the wall. Open and closed chambers can be connected to the main chimney or exhaust gases through a hole in the wall.
The design is equipped with a copper heat exchanger and a circulation pump that pumps liquid into the heating system. There is also a plate radiator for heating water.
Cerapur Smart, Comfort, ACU are condensing boilers. This system provides economical fuel consumption through the use of steam. Wall and floor units are equipped with condensate collectors. The principle of operation of the system is shown in the picture:
The output of combustion products occurs through a coaxial chimney. Some models have a remote control.
You can find the decoding of the values in the instructions and our table.
- Checking the operation of the fan.
- Pressure switch diagnostics.
For atmospheric chambers:
- Check for traction. Cleaning the chimney.
- Inspection of the thrust sensor, replacement in case of breakage.
60 Electronic module failure. The ignition resistor or other element may have burned out. Diagnostics of the electronic part is required. 75 Damage to the main module. Damage to the ignition circuit, ionization. Humidity on the board is removed by drying the element. 90 Problems with temperature limiter. Checking and replacing:
- Hot water sensor.
- Thermostat.
- Control boards.
- Inspection of the air duct for blockages.
Junkers Eurostar, Junkers Ceraclass AA The flow temperature in the heating system is too high. Low water flow. What to do:
- Clean the heat exchanger plates from dust with a brush. Internal parts are cleaned of scale with a special solution.
- Pump health diagnostics.
- If the temperature sensor is faulty, install a new element.
A4 Poor removal of combustion products. Something interferes with the removal of gases from the chamber, clean the system. A7 Damage to the hot water temperature sensor. Check the details, its contacts and supply a new element if necessary. A8 Regulator connection broken. Regulator replacement. A9 Temperature sensor incorrectly installed. Install the sensor correctly. Ad No communication with boiler temperature sensor. Inspection of contacts, connections, wiring. Sensor diagnostics. C4 Pressure switch broken. The switch, wiring, tube integrity are inspected. C6 Fan failure. The fan in closed chambers is responsible for the removal and injection of air. It is necessary to find out the cause of the breakdown and carry out repairs. CC Communication with an external thermometer is not detected. Tighten the contacts, make sure the wiring is intact and the thermometer is working. CE The heating system has lost pressure. Measure indicators, and add water if necessary. CF The pressure sensor has tripped. Similar actions CE. E2 The supply water temperature sensor is damaged. Make sure the wires are not damaged and the contacts are closed. Error E9 The heat exchanger or flue gas thermostat has tripped. Inspection in progress:
- thermostat;
- control boards;
- pump.
Cleaning the chimney.
EA The flame in the burner is not detected.
- Open the gas valve.
- Find out if the fuel flow switch is working.
- Eliminate the blockage of the radiator, condensation siphon.
- Check for draft in the chimney.
F1 Data error. Boiler reboot. F7 Machine is off, but flame is detected. System restart. FA Gas off, but system indicates flame present. Actions are similar to F7. Fd Reset key pressed accidentally. Click again. Junkers with S4962 board E01 / E02 The boiler does not recognize the flame; an indication of its presence when the fuel is cut off. E03 Overheating. Broken contacts with the overheating sensor. Element diagnostics. E04 The pressure switch circuit is closed before ignition. E05 The pressure switch does not work. The fan does not rotate. Check circuit, fan and pressure switch. E06 The air sensor circuit does not close, within 5 ignition attempts. Proceed according to E05. E07 Fan protection turned on. E08 Incorrect operation of the ionization circuit. Diagnostics and repair. E09 Incorrect operation of the GC scheme. E10 EEPROM memory error. Installing a new module. E30 (wiring violation); E31; E32 Thermostat NTC CH heating. Checking and repairing chains. DHW sensor NTC DHW. Flue gas sensors NTC Flue. E33 Overheating in the heating part. Cleaning the heat exchanger from scale, adjusting the temperature on the panel. E34 / E35 Insufficient voltage in the network. Wait until the supply is restored. E37 Overheating of combustion products. Inspect the sensor, the patency of the withdrawal paths.
Be mindful of your technique. Do not delay the repair: if you notice signs of a problem, try to fix it. Or contact the service center.