Operating instructions

Fault code
in the dis-
play
Const. Weat-
h.
comp.
System
character-
istics
Cause Remedy
F2 X X Burner in
fault state
Temperatur e limiter
has responded
Check the
heating sys-
tem water
level. Check
the circula-
tion pump.
Vent the heat-
ing system.
Check the
temperature
limiter and
leads.
Press E .
F3 X X Burner in
fault state
The flame signal is
already present at
burner start
Check the
ionisation
electrode and
leads.
Press E .
F4 X X Burner in
fault state
No flame signal is
present
Check the
ionisation
electrode and
leads, mea-
sure the ioni-
sation cur-
rent, check
the gas pres-
sure, check
the gas com-
bination
valve, igni-
tion, ignition
module, ign i-
tion electro-
des and the
condensate
drain.
Press E .
Checking and acknowledging faults (cont.)
81
Troubleshooting
5692 548 GB