52
Displayed
fault code
System characteris-
tics
Cause
Measures
F F4
Flame does not build
during the safety
time, no signal cap-
tured by the ionisa-
tion flame monitor
Gas train does not
open
Check connecting cable;
check gas train and re-
place if required
F F4
Flame does not build
during the safety
time, no signal cap-
tured by the ionisa-
tion flame monitor
Combustion char-
acteristics not ide-
al
Adjust the burner (see
from page 19); if necessa-
ry also adjust the setting
screws when the burner is
off to be able to start the
burner
F F5
Air pressure switch
shows no air pres-
sure, fan not running
Air pressure switch
is faulty, incorrectly
connected or incor-
rectly set
Replace air pressure
switch; connect or set cor-
rectly
F F5
Air pressure switch
switches off during
operation
Flue gas back
pressure; conden-
sate banked up; air
pressure switch
hose faulty; con-
necting hose leak-
ing
Remove flue gas back
pressure; check if con-
densate banked up; reset
burner control unit; re-
place hose
F F6
Gas pressure switch
notifies no gas pres-
sure
Gas shut-off valve
closed; gas pres-
sure switch faulty;
multiple problems
with gas supply
Open gas shut-off valve;
check gas flow pressure;
replace gas filter if re-
quired; reset burner con-
trol unit; replace gas train
F F7
Fan pressure is pro-
duced during the air
pressure switch idle
state check
Wind influence on
fan
Check flue outlet (chim-
ney)
F F7
Air pressure switch
contact is not in the
idle state
Air pressure switch
faulty
Replace air pressure
switch
F F8
Flame tears off dur-
ing operation
Incorrect gas type
selected
Selecting the gas type
(see from page 10)
F F8
Flame tears off dur-
ing operation
Burner gauze as-
sembly faulty
Check burner gauze as-
sembly; replace if dam-
aged
Troubleshooting
Fault codes
(cont.)
5683 757 GB
Содержание CM2
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