Fault Codes

Listed below are the common Zanussi fault codes as described by the boiler manufacturer along with a possible cause.

Zanussi Boiler Fault Codes

Fault CodeSystem Behaviour
C0 Boiler chip card (BCC) activation fault
C2 Boiler chip card (BCC) fault
F1 Low water pressure
F2 Flame loss
F3 Fan fault
F4 Flow thermistor
F5 Return thermistor
F6 Outside sensor failure
F7 Low mains voltage
F9 Unconfigured printed circuit board (PCB)
L1 Flow temperature overheat or no water flow
L2 Flame loss
L5 5 boiler resets in 15 minutes
L6 False flame lockout
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