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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.
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