53
Displayed
fault code
System characteris-
tics
Cause
Measures
F F8
Flame tears off dur-
ing operation
Combustion char-
acteristics not ide-
al
Adjust burner (see from
page 19)
F F9
Fan not running; fan
speed not reached
Fan faulty; cables
are faulty or bro-
ken
Check cables; replace fan
if required
F F9
Status duration too
long, fan ramp-up
Internal fault; fan
cannot reach its set
value
Replace fan or burner
control unit
F F9
Varying fan speed
Fan faulty, cable
"
a-Ö
A" faulty or
broken. Check ca-
ble "
a-Ö
A"; check
external power
supply; replace the
cable or fan; re-
move foreign bod-
ies
Check cable, possibly re-
place cable "
a-Ö
A" or
fan
F F9
No fan feedback
Fan faulty, external
fan power supply
not connected or
faulty "
a-Ö
A" or
cable faulty or bro-
ken, fan blocked
(poss. by foreign
bodies)
Check cable "
a-Ö
A",
check external power
supply, replace cable or
fan, remove foreign bod-
ies
F FA
Fan runs without de-
mand; burner control
unit in a fault state
Fan does not reach
idle state, cable
"
a-Ö
A" faulty, fan
faulty, faulty burner
control unit
Fan subject to wind influ-
ence, check flue outlet
and fan, replace cable
"
a-Ö
A", replace fan, re-
place burner control unit
F Fb
Burner does not start Excessive com-
bustion chamber
pressure (LDW2);
flue gas path or
condensate path
blocked
Check condensate drain
and flue gas path for
blockages
Troubleshooting
Fault codes
(cont.)
5683 757 GB
Содержание CM2
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