Code Description Action
FUSE 24V circuit dead Check Transformer & replace if necessary
Check 24V fuse on Control Board
If 24V fuse blown check for short circuits before replacing
00 Flame Error (signal present when there should not be) Replace Control Module
02 No ignition after restart Check inlet gas pressure
Check wiring to ignition/detection electrode
Check condition of ignition/detection electrode
If above OK replace control module
03 Internal Failure Check gas valve wiring
Check gas valve solenoids not open circuit
Check general wiring harness and connections
If all OK. replace control module
04 Non-volatile lockout Press reset
05 Internal failure Check wiring harness & connections
If wiring OK replace control module
06 Internal failure Check wiring harness & connections
If wiring OK replace control module
07 Internal failure Check wiring harness & connections
If wiring OK replace control module
08 Air Pressure Switch did not close Check motorised damper operating
Check air damper is opening
Check ue for blockage
Check/clean burner
Check Air Pressure Switch sensing pipes condition
Check fan speed
Check air Pressure Switch & replace if necessary
11 EPROM read/write error
Press reset. If fault keeps re-occuring Replace Control Module.
12 24V fuse blown Check 24V fuse on Control Board
If 24V fuse blown check for short circuits before replacing
Check gas valve leads & solenoids for short circuit
13 Internal failure Check wiring harness & connections
If wiring OK replace control module
14 Internal failure Check wiring harness & connections
If wiring OK replace control module
15 Internal failure Check wiring harness & connections
If wiring OK replace control module
16 Internal failure Check wiring harness & connections
If wiring OK replace control module
17 Internal failure Check wiring harness & connections
If wiring OK replace control module
18 Flow temperature too high Check no air in system or boiler
Check adequate ow of water through boiler
19 Return temperature too high Check no air in system or boiler
Check adequate ow of water through boiler
25 Flow temperature rise too fast Check no air in system or boiler
Check adequate ow of water through boiler
28 No tacho signal from fan Check wiring to fan
If wiring OK replace fan
MASTER AND SLAVE BOILER CONTROL MODULE ERROR CODES