Faults Without Fault Display - Viessmann VITOCROSSAL 200 Service Instructions Manual

Troubleshooting
Diagnosis
(cont.)
Fault code System character-
istics
F 54 PWM values incor-
rect
F 55 Parameter memory
stick fault
Internal system fault
Internal system faults are created if a perfect program sequence can no longer
be guaranteed.
Fault code System character-
istics
01 to 03, Fault in area of
05 to 0D, burner control unit
0F, 14, 15,
17, 1A to
1C, 1E, 45,
47, AC, B0
F 0E, F 1D Fault in area of
burner control unit

Faults without fault display

Fault
Combustion fault through
pulsation
46
Cause
EEPROM of
memory stick
modified or de-
leted; stick faulty
Memory stick
faulty
Cause
Internal system
fault
EEPROM or inter-
nal system fault;
EMC fault
Cause
Excessive gas through-
put
Too little or too much air
Condensate banked up
in flue gas system
Incorrect flue draught
Measures
Replace memory stick
Replace memory stick
Measures
Replace burner control
unit
Have your system
tested for EMC interfer-
ence; replace burner
control unit
Remedy
Adjust the gas throughput
in accordance with the
rated boiler output.
Adjust the gas throughput
in accordance with the
rated boiler output.
Check the condensate
drain.
Check flue draught.