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
ther
mal 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 er
ror/No flame
Internal error
●
Check PCB
Activate BCC/No flame
New BCC (If required)
●
T
urn to reset to activate
Safety system failure/
Failure of internal self checking system
●
Check PCB
No flame
E
BCC er
ror/No flame
Incorrect /missing BCC
●
Reseat or r
eplace BCC (if fitted)
●
Check CH flow and r
eturn
Water flow failure
●
Check pump
O
Flame for a shor
t period
Sensor temperature differential
●
Check no air is in heat exchanger/CH system
only
incorrect
●
Check pipe connections
●
Check wir
es to flow and return sensors are not crossed
P
Power supply er
ror/
Low mains voltage
●
Check mains voltage into boiler
No flame
●
Check PCB connectors
●
Check DHW flow switch & lead
DHW cold
Defective DHW thermister
●
Check Diver
ter 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: F
AULT 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