Faults Without Fault Display - Viessmann VITOCROSSAL 200 Service Instructions Manual

Troubleshooting
Fault codes
(cont.)
Internal system fault
Internal system faults are created if a perfect program sequence can no longer be
guaranteed.
Display System characteris-
tics
F E5, F EC, Fault around burner
F Ed, F EE, control unit
F Fd, F FF

Faults without fault display

Fault
Combustion faults
through pulsation
Thermo-acoustics/
combustion noise
CO content too low
2
CO is formed or burner
is very sooty
Flame extinguishes
during operation
64
Cause
Internal system
fault and EMC
Cause
Excessive gas through-
put
Insufficient or exces-
sive air
Condensate banked up
in flue system
Incorrect flue outlet
Incorrect CO settings;
2
insufficient or exces-
sive air
Incorrect setting
Insufficient or exces-
sive air
Insufficient draught in
flue system
Inlet strainer of gas
train contaminated
Measures
Reset burner control unit.
Replace the burner con-
trol unit if the fault per-
sists
Action
Adjust gas throughput in accord-
ance with rated boiler heating out-
put.
Check condensate drain.
Check flue outlet and flue sys-
tem.
Adjust burner in accordance with
the details from page 27.
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.
Adjust correctly. Check ventilation
of installation room.
Check flue system.
Remove flange and clean strain-
er.