Viessmann VITOCROSSAL 200 Service Instructions Manual page 43

Diagnosis
(cont.)
Fault code System characteris-
tics
2C Burner control unit
fault
2d Burner control unit
fault
2E Burner control unit
fault
2F Burner control unit
fault
2H Burner control unit
fault
31 Burner control unit
fault
32 Burner control unit
fault
35 Burner control unit
fault
36 Fan speed during
start-up or during
operation is outside
the set range for lon-
ger than 5 s; the
speed for ignition set-
ting or start-up output
in operation is not
reached
Cause
Fault during test of
safety inputs
Internal fault, low
voltage recog-
nised
Internal fault, volt-
age failure recog-
nised
Internal heat
demand fault
Lead break, strap-
ping plug fJ,
safety chain
Error in feedback
from gas safety
valves, output
relay does not
respond
Error in feedback
from choke valve,
output relay does
not respond
Error in feedback
from ignition, out-
put relay does not
respond
The fan is faulty;
cable "100a" is
faulty or broken
Troubleshooting
Measures
Replace burner control
unit.
Replace burner control
unit.
Replace burner control
unit.
Replace burner control
unit.
Check strapping plug
fJ.
Replace burner control
unit.
Replace burner control
unit.
Replace burner control
unit.
Check the cable and
replace cable "100a" or
the fan if required.
43