Viessmann VITODENS 200-W Installation And Service Instructions Manual page 70

Troubleshooting
Fault codes
(cont.)
Fault code dis- System characteristics
played
EF Burner in a fault state
F0 Burner blocked or in a fault
state
F1 Burner in a fault state
F2 Burner in a fault state
F3 Burner in a fault state
F8 Burner in a fault state
F9 Burner in a fault state
FA Burner in a fault state
Fb Burner in a fault state
70
Cause
Flame is lost immediately
after it has built (during
safety time).
Internal fault
Flue gas temperature lim-
iter has responded.
Temperature limiter has
responded.
Flame signal is already
present at burner start.
Fuel valve or modulation
valve will not close.
Fan speed too low
Fan idle state or set speed
not reached
Flame loss in the stabilisa-
tion or operating phase
Measures
Check gas supply (gas pressure
and gas flow switch).
Check balanced flue system for
flue gas recirculation.
Check ionisation electrode for the
following:
Distance to burner gauze assem-
■
bly (see page 35)
Contamination on electrode
■
Press reset button R.
Press reset button R. Replace con-
trol unit if fault is permanent.
Check heating system fill level.
Vent the system.
Press reset button R after flue sys-
tem has cooled down.
Check heating system fill level.
Check circulation pump. Vent the
system. Check temperature limiter
and connecting cables.
Press reset button R.
Check ionisation electrode and
connecting cable.
Check system for condensate
backup.
Note
To prevent water damage, detach
fan unit before removing the burn-
er.
Press reset button R.
Check the gas train and replace if
required.
Press reset button R.
Check fan, fan connecting cables
and fan power supply.
Press reset button R.
Check fan, check connecting ca-
bles to fan.
Press reset button R.
Check gas supply (gas pressure
and gas flow switch).
Check balanced flue system for
flue gas recirculation.
Check ionisation electrode for the
following:
Distance to burner gauze assem-
■
bly (see page 35)
Contamination on electrode
■
Press reset button R.