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Rectifying faults
F0 (and possibly ) flashing.
Internal failure
Check Action
1. B Activate menu option
Show service parameters.
B Select 9.3 GFA-Asic-error.
A message is displayed.
B Record figure displayed in service report.
↓2.
2. B Select 5.2 GFA status / error.
A message is displayed.
B Record figure displayed in service report.
3. B Select Settings -> Service ->
Further options -> Fault history.
Other faults apart from F0 dis-
played?
yes: B Deal with fault(s) displayed as instructed in rele-
vant fault table(s) .
no: ↓3.
4. flashing? yes: B Press button .
B Initiate demand for heat by pressing the . but-
ton and then cancel after 30 seconds by pressing
the button again.
B Initiate demand for heat twice more as described
above.
F0? ↓4.
no: ↓4.
5. The PCB control board is damaged. 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.
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