Faults Without Fault Display - Viessmann Vitocrossal 200 Service Instructions For Contractors

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 tears off during
operation
54
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 system
Adjust burner in accordance with
the details from page 19
Check whether the burner has
been adjusted to the correct gas
type. Change gas restrictor if nec-
essary (see from page 10).
Adjust burner in accordance with
the details from page 19
Adjust correctly. Check ventilation
of installation room
Check flue system
Remove flange and clean strainer