64
Internal system fault
Internal system faults are created if a perfect program sequence can no longer be
guaranteed.
Display
System characteris-
tics
Cause
Measures
F E5, F EC,
F Ed, F EE,
F Fd, F FF
Fault around burner
control unit
Internal system
fault and EMC
Reset burner control unit.
Replace the burner con-
trol unit if the fault per-
sists
Faults without fault display
Fault
Cause
Action
Combustion faults
through pulsation
Excessive gas through-
put
Adjust gas throughput in accord-
ance with rated boiler heating out-
put.
Insufficient or exces-
sive air
Condensate banked up
in flue system
Check condensate drain.
Incorrect flue outlet
Check flue outlet and flue sys-
tem.
Thermo-acoustics/
combustion noise
Incorrect CO
2
settings;
insufficient or exces-
sive air
Adjust burner in accordance with
the details from page 27.
CO
2
content too low
Incorrect setting
Check whether the burner has
been adjusted to the correct gas
type; change gas restrictor if re-
quired (see from page 11).
Adjust burner in accordance with
the details from page 27.
CO is formed or burner
is very sooty
Insufficient or exces-
sive air
Adjust correctly. Check ventilation
of installation room.
Insufficient draught in
flue system
Check flue system.
Flame extinguishes
during operation
Inlet strainer of gas
train contaminated
Remove flange and clean strain-
er.
Troubleshooting
Fault codes
(cont.)
5794 780 GB