Worcester Bosch CDI Classic Combi Boiler Error Codes

Fault Description	System Behaviour
A1	Water is leaking or the pump needs replacing or freeing due to the pump running dry.
A7	The hot water negative thermistor coefficient (NTC) sensor is defective – the hot water sensor or connecting leads need checking.
A8	Break communication to FX sensor controls electrical connections need checking.
B1	Code plug not detected .
C6	Fan speed too low – the fan lead and connector need checking and may need replacing.
E2	Central heating (CH) water flow negative thermistor coefficient (NTC) sensor defective check CH flow NTC sensor and connection leads.
E9	Safety temperature limiter in central heating (CH) flow has tripped the system pressure or safety temperature limiter needs checking
EA	Flame not detected due to a gas issue – the gas supply, power supply or igniter, electrode and lead need checking – contact a Gas Safe installer.
F0	Internal error – electrical connector contacts or programmer interface module – check ignition leads are not loose.
F7	Flame detected even though the appliance is switched off – check the electrode assembly is dry and the pcb and flue are clear.
FA	Flame detected after gas shut off – the gas valve needs checking – hire a Gas Safe installer.
FD	Reset button pressed by mistake – press reset button again.