LED CODE FAULT/EFFECT REASON ACTION
● Check flow, return and flue sensors
Defective flow, return or flue sensor,
● Check wiring to sensors
Defective sensor or
or heat exchanger reached maximum
● Check PCB/X6 & X8 connectors
5
thermal fuse gone
safe working temperature
● CHECK THERMAL FUSE IS OPEN CIRCUIT.
IF THAT THE CASE HEAT EXCHANGER HAS TO BE
REPLACED - SEE SECTION 9.8.
Defective gas valve/
5 sec flame signal after burner
● Check gas valve and lead
6 Flame continues after
is switched off
● Check PCB
demand ends
● Check fan
7 Defective fan/No flame Missing or Erroneous RPM signal
● Check mains fan lead & connector
● Check low voltage fan lead & connector
● Check PCB/X3 connector
A PCB error/No flame Internal error ● Check PCB
Activate BCC/No flame New BCC (If required) ● Turn to reset to activate
Safety system failure/
Failure of internal self checking system
●
Check PCB
No flame
E BCC error/No flame Incorrect /missing BCC ● Reseat or replace BCC (if fitted)
● Check CH flow and return
Water flow failure
● Check pump
O
Flame for a short period
Sensor temperature differential
● Check no air is in heat exchanger/CH system
only
incorrect
● Check pipe connections
● Check wires to flow and return sensors are not crossed
P
Power supply error/
Low mains voltage
● Check mains voltage into boiler
No flame ● Check PCB connectors
● Check DHW flow switch & lead
DHW cold Defective DHW thermister
● Check Diverter valve & lead
or open circuit
● Check PCB/X4 connector
● Check filter in flow switch
(No display) No light indication Defective power supply
● Check power supply
● Check PCB/X1B connector
● Check PCB fuse
BLOCKING CODES
29
NOTE: FAULT CODES 1 TO 4 CAN BE RESET BY FOLLOWING THE PROCEDURE ABOVE, HOWEVER IF ANY
OTHER FAULT CODE IS SHOWING PLEASE CONTACT YOUR INSTALLER OR HALSTEAD BOILERS LTD. SERVICE
HELP LINE: 01926 834834
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