Viessmann VITODENS 343-F WS4A Installation And Service Instructions Manual page 97

Fault codes
(cont.)
Fault code System character-
on the dis- istics
play
EA Burner in a fault
state
Eb Burner in a fault
state
EC Burner in a fault
state
Ed Burner in a fault
state
F0 Burner blocked
F1 Burner in a fault
state
F2 Burner in a fault
state
F3 Burner in a fault
state
Cause Measures
The ionisation Check the ionisation
current lies out- electrode and cable.
side the permissi- Press "E RESET".
ble range during
calibration
Heat draw-off re- Initiate heat draw-off
peatedly too low and trigger manual cali-
during calibration bration (see page 112)
Press "E RESET".
The ionisation Check the ionisation
current lies out- electrode and cable.
side the permissi- Press "E RESET".
ble range during
calibration
Internal fault Replace the control unit.
Internal fault Replace the control unit.
Flue gas tem- Check the heating sys-
perature limiter tem water level. Vent the
has responded. system.
Press "E RESET" after
the flue gas system has
cooled down.
The temperature Check the heating sys-
limiter has re- tem water level. Check
sponded. the circulation pump.
Vent the system. Check
the temperature limiter
and connecting cables.
Press "E RESET".
Flame signal is al- Check the ionisation
ready present at electrode and connect-
burner start. ing cable.
Press "E RESET".
Troubleshooting
97