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131
Dis-
played
fault
code
Const.
Weath.-
comp.
System char-
acteristics
Cause
Measures
EF
X
X
Burner in a fault
state
Flame is lost
immediately
after it has
built (during
the safety
time).
Check gas supply
(gas pressure and
gas flow switch).
Check balanced
flue system for flue
gas recirculation.
Check ionisation
electrode (replace
if required):
■ Distance to burn-
er gauze assem-
bly (see page 46)
■ Electrode con-
tamination
Press reset button
R
.
F0
X
X
Burner blocked Internal error
Replace control
unit.
F1
X
X
Burner in a fault
state
Flue gas tem-
perature has
exceeded
limit.
Check heating sys-
tem fill level. Vent
the system.
Press reset button
R
after flue system
has cooled down.
F2
X
X
Burner in a fault
state
Boiler water
temperature
sensor has
responded.
Check heating sys-
tem fill level. Check
circulation pump.
Vent the system.
Check boiler water
temperature sen-
sor and connecting
cables.
Press reset button
R
.
Troubleshooting
Fault codes
(cont.)
5585 174 GB
Service