Junkers Eurostar Error Codes
Error A3 - The flue gas sensor has a fault or a short circuit. Check sensor and cable and replace if necessary.
Error A4 - Exhaust gas outlet through the flue gas box. Check the chimney.
Error A7 - Open circuit in the NTC sensor circuit for hot water supply. Check sensor and cable.
AC error - A gap between the TA 211E or RAM and the control unit. Check the cable.
Error b1 - The coding plug is not recognized by the electronic board. Correctly install the plug, replace if necessary.
CC error - Outside temperature sensor circuit of TA 211E block has a break. Check the outdoor sensor and cable.
Error d1 - The return voltage from the LSM does not come. 5. Check the LSM 5 circuit for the flue gas valve.
Error E0 - Internal fault on the electronic board. Replace the electronic board.
Error E2 - Open 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 NTC flow sensor, pump, and fuses on the electronic board.
Error EA - No ionisation current. Check inlet gas pressure, power supply, ignition electrode with cable, and ionization electrode with cable.
Error F7 - Incorrect ionization signal. Check the ionisation electrode with the cable for damage.
FA Error - The ionisation current remains after the regulators have been switched off. Check the gas fitting.
Junkers Ceraclass Error Codes
A7 - The hot water temperature sensor is defective.
A9 - The hot water temperature sensor is not installed correctly.
C4 - Differential pressure switch in non-operating position does not open.
C6 - The differential pressure switch is not closed.
CC - Outside temperature sensor not detected.
E2 - The flow temperature sensor does not work.
E9 - The limiter in the flow line has tripped.
EA - No flame detected.
F0 - Internal fault.
F7 - Although the appliance is switched off, a flame is detected.
FA - A flame was detected after the gas supply was cut off.