Internal System Fault; Faults Without Fault Display; Adjusting Coding Addresses At The Control Unit - Viessmann Vitocrossal 200 CM2 400 Service Instructions Manual

Troubleshooting
Fault Codes
(continued)

Internal system fault

Internal system faults are created if a perfect program sequence can no longer be guaranteed.
Displayed Fault Code
F E5, F EC, F ED, F
FD, F FF

Faults Without Fault Display

Fault
Combustion fault
through pulsation
Thermo-acoustics/
combustion noise
CO content too low Incorrect setting
2
CO is formed or
burner is very sooty
Flame extinguishes
during operation
58
System Characteristics
Fault around burner
control unit
Cause
Excessive gas input
Insufficient or excessive air
Condensate build up in flue
system
Incorrect flue outlet
Incorrect CO settings;
2
insufficient or excessive air
Insufficient or excessive air Adjust correctly. Check ventilation of installation room.
Insufficient draught in flue
system
Inlet strainer of gas valve
contaminated
Vitocrossal 200, CM2 400, 500, 620 and 620 TX Service
Cause
Internal system fault and
EMC
Measures
Adjust gas input in accordance with rated boiler heating output
Check condensate drain.
Check flue outlet and flue system.
Adjust burner in accordance with the details on page 46.
Check that burner has been adjusted for the correct gas type, and
change gas orifice if required (see from page 14).
Adjust burner in accordance with the details on page 46.
Check flue system.
Remove flange and clean strainer.
Measures
Reset burner control unit. Replace the
burner control unit if the fault persists.