Operating instructions

Fault
code in
the dis-
play
Const. Weath.-
comp.
System char-
acteristics
Cause Remedy
E6 X X Burner fa ult Flue gas/
ventilation
system
blocked
Check the flue
gas/ventilation
system and differ-
ential pressure
sensor; press "E"
F0 X X Burner
blocked
Internal fault Replace control
unit
F1 X X Burner fault Flue gas
temperature
limiter has
responded
Check flue gas
path/route, press
"E"
F2 X X Burner fault The tem-
perature lim-
iter has
responded
Check the heating
system fill level,
the circulation
pump, the tem-
perature limiter
and inter connect-
ing cables/leads;
ventilate the sys-
tem; press "E"
F3 X X Burner fault Flame sig nal
is already
present at
burner start
Check the ionisa -
tion electrode and
interconnecting
leads; pr ess "E"
F4 X X Burner fault No fla me sig-
nal.
Check the ionisa -
tion electrode,
ignition, ignition
module, intercon-
necting cables
and leads, gas
pressure, gas
combination valve
and the ioni sation
current; press
"E"
F7 X X Burner
blocked
Differential
pressure
sensor faulty
Check differential
pressure sensor
and lead
Fault codes (cont.)
77
Troubleshooting
5692 619 GB