Installation Instructions

47
Displayed
fault code
System characteris-
tics
Cause Measures
F2 Burner in a fault
state
The temperature
limiter has respon-
ded
Check heating system fill
level. Check circulation
pump. Vent the system.
Check the temperature
limiter and connecting
leads (see page 53).
Press "Reset" (see
page 48).
F3 Burner in a fault
state
Flame signal is
already present at
burner start
Check ionisation elec-
trode and connecting
cable.
Press "Reset" (see
page 48).
F4 Burner in a fault
state
No flame signal Check the ignition/ionisa-
tion electrode and cables,
check the gas pressure,
check the gas train, igni-
tion, ignition module and
condensate drain.
Press "Reset" (see
page 48).
F8 Burner in a fault
state
Fuel valve closes
too late
Check gas train. Check
both control paths.
Press "Reset" (see
page 48).
F9 Burner in a fault
state
Fan speed too low
during burner start
Check fan, fan connecting
cables and power supply;
check fan control.
Press "Reset" (see
page 48).
FA Burner in a fault
state
Fan not at stand-
still
Check fan, fan connecting
cables and fan control.
Press "Reset" (see
page 48).
FC Burner blocked Electrical fan con-
trol (control unit)
faulty
Check fan connecting
cable; if required, replace
or replace control unit.
Troubleshooting
Fault messages on the display
(cont.)
5609 059 GB
Service