|
BOSCH WORCESTER CONDENSING BOILER FAULT CODES |
f your Bosch Worcester condensing boiler is showing
a fault code it should be listed below, in some cases these can be fixed
by the competent DIY'er
|
A1 |
PUMP HAS
RUN DRY
Check system pressure, add water and then bleed if necessary. |
|
A7 |
HOT
WATER NTC SENSOR DEFECTIVE
Check NTC sensor and connecting leads for circuit breaks and/or short circuits. |
|
A8 |
BREAK IN
COMMUNICATION
Check connecting lead to programmer |
|
b1 |
KEYED
PLUG NOT DETECTED
Insert keyed plug correctly, test and replace if necessary. |
|
C1 |
FAN
SPEED TOO LOW
Check fan lead and connector, and fan; replace as necessary. |
|
d3 |
JUMPER
8-9 NOT CONNECTED
Connector not connected, link missing, or under floor heating limiter tripped. |
|
E2 |
CH FLOW
NTC SENSOR DEFECTIVE.
Check CH flow NTC sensor and connecting lead. |
|
E9 |
SAFETY
TEMPERATURE LIMITER IN CH FLOW HAS TRIPPED
Check system pressure, check safety temp. limiters, check pump operation, check 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 and bus module are not loose; replace pcb or bus module if necessary. |
|
F7 |
FLAME
DETECTED ALTHOUGH APPLIANCE IS SWITCHED OFF
Check electrode assembly, dry pcb. Flue clear? |
|
FA |
FLAME
DETECTED AFTER GAS SHUT OFF
Check gas valve and wiring to gas valve. Clean condensation trap and check electrode assembly. Flue clear? |
|
Fd |
RESET
BUTTON PRESSED BY MISTAKE
Press reset button again! |
| P1,P2,P3 |
PLEASE
WAIT INITIALISATION IN PROGRESS
24 Volt fuse blown, replace fuse! |
| Ask a question in the Plumbing forum |
|---|
| Central heating |
|---|