Fault Code Possible Fault
9A Incorrect HCM fitted
9U Problem with the code plug (faulty or not connected)
B7 Replace control board
C6 Running too fast / Running too slow
C7 Fan not running / Fan not running or airflow blocked
D1 Sensor wet or damaged (the boiler will block for 300 seconds before this condition)
D1 Sensor disconnected or damaged (the boiler will block for 300 seconds before this condition)
D1 Boiler overheat
E2 Flow sensor shorted or damaged
E2 Flow sensor disconnected or damaged
E5 Primary flow sensor overheated
E9 The main heat exchanger has overheated.
Maximum temperature 105°C
E9 Maximum temperature sensor on the main heat exchanger has failed
E9 Maximum temperature sensor on the main heat exchanger has not been recognised
E9 Flue gas thermostat overheat
EA Failure of four ignition attempts. The boiler waits 30 seconds before another attempt is made
EA An established flame has been extinguished.
This could be caused by:
moisture in the sump, due to a blocked sump/condensate trap.
a strong wind into the flue
EA Gas valve coil disconnected
EA Flame not established during the first 4 seconds ignition period
EA There is an error where the pump is not detecting water – check pressure gauge and repressurise to 1 bar.