73
Faults are indicated by a flashing mes-
sage code (e.g. "F30") and fault sym-
bol or .
Displayed
fault code
System character-
istics
Cause Measures
06 Burner locked out System pressure
too low
Check the system pres-
sure. If required, top up
heating water (see
page 34).
0A Burner locked out Gas supply pres-
sure too low
Check gas pressure and
gas pressure switch.
0C Burner locked out Mains voltage too
low
Check power supply.
CC Function at the ex-
ternal extension faul-
ty
Communication
between control
unit and external
extension interrup-
ted
Check connecting lead
between control unit and
external extension.
F02 Burner in a fault
state
Temperature limit-
er has responded.
Check heating system fill
level. Check circulation
pump. Vent the system.
Check the temperature
limiter (see page 80)
and connecting cables.
Hold down MODE + OK
simultaneously until
flashes (reset).
Troubleshooting
Fault display
5837146
Service
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