F00: Fault: Flow temperature sensor

F01: Fault: Return temperature sensor

F10: Short circuit: Flow temperature sensor

F11: Short circuit: Return temperature sensor

F12: Short circuit: Cylinder temperature sensor

F13: Short circuit: Temperature sensor for the domestic hot water cylinder

F20: afety shutdown: Overheating temperature urereached

F22: Safety shutdown: Water deficiency in the boiler

F23: Safety shutdown: Temperature spread too great (NTC1/NTC2)

F24: Safety shutdown: Temperature rise too fast

F25: Safety shutdown: Flue gas temperature too high

F27: Afety shutdown: Fault in flame detection

F28: Fault: Ignition unsuccessful when starting up

F29: Fault: Reignition following flame loss unsuccessful

F32: Fan speed outside of the tolerance values

F49: eBUS fault: Voltage too low

F61: Fault: Fuel valve actuation. The gas valve assembly cannot be actuated

F62: Fault: Gas valve switch-off control

F63: Fault: EEPROM

F64: Fault: Electronics / sensor / analogue-to digital converter

F65: Fault: Electronics temperature too high

F67: Value sent back by ASIC is incorrect (flame signal)

F68: Fault: Unstable flame (analogue input)

F70: Invalid product code (DSN)

F71: Fault: Flow/return temperature sensor

F72: Fault: Deviation in the water pressure sensor/return temperature sensor

F73: Fault: Water pressure sensor short circuited

F74: Fault: Water pressure sensor not connected

F75: Fault: Pump/water deficiency

F76: The safety cut-out in the primary heat exchanger is defective

F77: Fault: Condensate or smoke

F78: Interruption to DHW outlet sensor at external control

F83: Fault: Dry fire

F84: Fault: Flow/return temperature sensor

F85: Fault: Temperature sensor

F87: Fault: Ignition transformer cable

F88: Fault: Gas valve assembly

F89: Fault: Pump

F97: Fault: Main PCB self-test failed

Connection: No communication between the main PCB and the user interface