Viessmann VITODENS 200-W Service Instructions Manual page 81

Fault codes
(cont.)
Fault Const.
code on
the dis-
play
F2 X
F3 X
F4 X
F7 X
F8 X
weath.- System char-
comp. acteristics
X Burner in a fault
state
X Burner in a fault
state
X Burner in a fault
state
X Burner blocked Short circuit
X Burner in a fault
state
Troubleshooting
Cause Measures
The tempera- Check the heating
ture limiter system fill level.
has respon- Check the circula-
ded tion pump. Check
the temperature
limiter and con-
necting cables.
Vent the system.
Press "E RESET"
Flame signal Check the ionisa-
is already tion electrode and
present at connecting cable.
burner start Press "E RESET"
No flame sig- Check the ionisa-
nal tion electrode and
cable, measure the
ionisation current,
check the gas
pressure, check
the gas train, igni-
tion, ignition mod-
ule, ignition elec-
trodes and the con-
densate drain.
Press "E RESET"
Check the water
or water pres- pressure sensor
sure sensor and the connecting
lead broken cable
The fuel valve Check the gas
closes too train. Check both
late control paths.
Press "E RESET"
81