Viessmann VITODENS 200-W Service Instructions Manual page 73

Fault codes
(cont.)
Fault Const. Weath.-
code on comp.
the dis-
play
Eb X X
EC X X
Ed X X
EE X X
System char- Cause
acteristics
Burner in a fault Heat draw-off
state repeatedly
too low during
calibration
Burner in a fault The ionisa-
state tion current
lies outside
the permissi-
ble range dur-
ing calibra-
tion
Burner in a fault Internal fault
state
Burner in a fault Flame signal
state is not present
or too weak at
burner start.
Troubleshooting
Measures
Initiate a heat
draw-off. Switch
the boiler OFF and
ON again.
Press "E
RESET".
Set coding address
12:1. This special
function leads to
heat being trans-
ferred to the heat-
ing circuit during
calibration.
Check the ionisa-
tion electrode and
cable.
Press "E
RESET".
Replace the control
unit.
Check the ionisa-
tion electrode and
connecting cable,
measure the ioni-
sation current,
check the gas sup-
ply (gas pressure
and gas flow lim-
iter), check the gas
train, ignition, igni-
tion module, igni-
tion electrodes and
the condensate
drain.
Press reset button
R.
73