Viessmann Vitocrossal 200 Service Instructions Manual page 43

Diagnosis
(cont.)
Fault code System character-
istics
2A Burner control unit
fault
2b Burner control unit
fault
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
longer than 5 s; the
speed for ignition
setting or start up
output in operation
is not reached
Cause Remedy
Internal fault of Replace the burner con-
the gas pressure trol unit.
switch input
Internal flame Replace the burner con-
monitor fault trol unit.
Fault during test Replace the burner con-
of safety inputs trol unit.
Internal low vol- Replace the burner con-
tage monitor fault trol unit.
Internal voltage Replace the burner con-
failure monitor trol unit
fault
Internal heat de- Replace the burner con-
mand fault trol unit.
Strapping plug Check the strapping
break fJ safety plug fJ.
chain
Error in feedback Replace the burner con-
from gas safety trol unit.
valves, output
relay does not re-
spond
Error in feedback Replace the burner con-
from auxiliary trol unit.
start up valve,
output relay does
not respond
Error in feedback Replace the burner con-
from ignition, out- trol unit.
put relay does not
respond
The fan is faulty; Check the cables and
cable "100a" is replace cable "100a" or
faulty or broken the fan, if required.
Troubleshooting
43