Operating instructions

125
Dis-
played
fault
code
Const. Weath.-
comp.
System char-
acteristics
Cause Measures
Ed X X Burner in a fault
state
Internal fault Replace control
unit.
EE X X Burner in a fault
state
Flame signal
is not present
or too weak at
burner start.
Check gas supply
(gas pressure and
gas flow switch).
Check gas train.
Check ionisation
electrode and con-
necting cable.
Check ignition:
■ Connecting
leads to ignition
module and igni-
tion electrode
■ Ignition elec-
trode gap and
contamination
(see page 42).
Check condensate
drain.
Press reset button
R.
Troubleshooting
Fault codes
(cont.)
5772 909 GB
Service