Worcester Greenstar 42 CDI Classic ErP Boiler Fault Codes

Code	Description	Remedy
A1	Pump has run dry or pump has stalled/seized	Check for water leaks. Free the pump or replace
A7	Hot water NTC sensor defective.	Check: - hot water NTC sensor - connecting lead for circuit breaks/short circuits.
A8	Break in communication to FX/Sense controls	Check electrical connections.
b1	Code plug not detected.	Insert code plug correctly, test and replace if necessary
C6	Fan speed too low.	Check: fan lead and connector, and fan; replace as necessary.
E2	CH flow NTC sensor defective.	Check CH flow NTC sensor and connecting lead.
E9	Safety temp. limiter in CH flow has tripped.	Check: - system pressure, - safety temp. limiters, - pump operation, - fuse on pcb, bleed appliance.
EA	Flame not detected.	Is gas cock turned on? Check: - gas supply pressure, - power supply, - igniter electrode and lead, - ionisation sensing electrode and lead, - flue duct and CO2 level.
F0	Internal error.	Check electrical connector contacts, programmer interface module ignition leads are not loose; replace pcb if necessary.
F7	Flame detected even though appliance switched off.	Check: - electrode assembly, - dry pcb. - Flue clear?
FA	Flame detected after gas shut off.	Check: - gas valve; resistance, coil 1 = 190, coil 2 = 390 - wiring to gas valve. Clean condensate trap and check electrode assembly. Flue clear?
Fd	Reset button pressed by mistake.	Press reset button again