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36
Rectifying faults
Error Fd
4.5
Faults that are not displayed
4.5.1
Appliance faults
Boiler indicates P1, P2, P3 at start-up and then restarts with P1..
Check
Action
1.
Fuse T 1,6 A (312) defective.
yes:
B
Power OFF the appliance.
B
Disconnect the boiler electrical connection.
B
Change the fuse.
B
Reconnect the boiler electrical connection.
B
Turn ON the appliance.
Start sequence not completed?
↓
2.
no:
↓
2.
2.
The PCB control board is damaged.
B
Make a note of the altered service settings (see
table 1 on page 7).
B
Power OFF the appliance.
B
Disconnect the boiler electrical connection.
B
Change PCB control board.
B
Reconnect the boiler electrical connection.
B
Turn ON the appliance.
B
Restore service settings previously noted down.
Excessive burner noise, rumbling noises
Check
Action
1.
Does the gas supply type match the
specifications on the appliance iden-
tification plate?
yes:
↓
2.
no:
B
Convert appliance to correct gas type.
Rumbling noises?
↓
2.
2.
B
Test gas supply pressure - OK?
Does pressure match figure speci-
fied in installation instructions?
yes:
↓
3.
no:
B
Decommission appliance.
Natural gas models:
B
Notify gas company.
3.
Problem with flue?
B
Check CO
2
level in combustion
air.
Is CO
2
level above 0,2 % ?
yes:
B
Check flue and repair or replace if necessary.
Rumbling noises?
↓
4.
no:
↓
4.
