Faults Without Fault Display - Viessmann Vitocrossal 200 CM2 186 Service Instruction

Vitocrossal 200 CM2 186 to 311 Service
Fault Codes
(continued)
Displayed System Characteristics
Fault Code
F F9 Varying fan speed
F F9 No fan feedback
F FA Fan runs without demand;
burner control unit in a
fault state
F Fb Combustion chamber
pressure too high; burner
control unit in a fault state
Internal system fault
Internal system faults are created if a correct program sequence can no longer be guaranteed.
Displayed System Characteristics
Fault Code
FD Fault within burner
control unit

Faults Without Fault Display

Fault Cause
Combustion fault Excessive gas input
through pulsation
Insufficient or excessive air
Condensate build up in flue
system
Incorrect flue outlet
Thermo-acoustics/ Incorrect CO
combustion noise insufficient or excessive air
CO content too Incorrect setting
2
low
CO is formed or Insufficient or excessive air Adjust correctly. Check ventilation of installation room.
burner is very sooty
Insufficient draught in flue
system
Flame extinguishes Inlet strainer of gas valve
during operation contaminated
Excessive flue gas Excessive gas throughput
temperature
Cause
Fan faulty, cable "a-ÖA" faulty or
broken
Fan faulty; external power supply to
fan not connected or faulty; cable
"a-ÖA" faulty or broken; fan blocked
(possibly by a foreign object)
Fan has not stopped; cable "a-ÖA"
faulty; fan faulty; burner control unit
faulty
Flue gas path or condensate path
blocked off
Motorized vent damper not
configured with control (if used)
Cause
No gas, exhaust recirculation, fan
not operating, air pressure sensor
defective
Measures
Adjust gas input in accordance with rated boiler heating output
Check condensate drain.
Check flue outlet and flue system.
settings; Adjust burner in accordance with the details on page 15.
2
Check that burner has been adjusted for the correct gas type,
and change gas restrictor if required (see from page 9).
Adjust burner in accordance with the details on page 15.
Check flue system.
Remove flange and clean strainer.
Adjust gas throughput in accordance with rated boiler heating
out-put. Check condition of secondary heating surfaces of the
boiler, and clean if required.
Troubleshooting
Measures
Check cable; replace cable "a-ÖA" or
fan if required
Check cable "a-ÖA", check external
power supply; replace cable or fan;
remove foreign object
Wind influence on fan; check flue
outlet and fan; replace cable "a-ÖA",
replace fan; replace burner control unit
Check flue gas path or condensate
path and clean if required
See flue gas damper setting
(common vent system)
Measures
Check each component, reset burner
control unit. Replace the burner
control unit if the fault persists.
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