Viessmann VITOCROSSAL 200 Instructions Manual page 42

Troubleshooting
Diagnosis
(cont.)
Fault code System characteris-
tics
22 The gas pressure lim-
iter signals no gas
pressure during the
safety time
25 No flame signal after
the safety time; the
ionisation flame mon-
itor reports no flame
signal
25 No flame signal after
the safety time; the
ionisation flame mon-
itor reports no flame
signal
25 No flame signal after
the safety time; the
ionisation flame mon-
itor reports no flame
signal
25 No flame signal after
the safety time; the
ionisation flame mon-
itor reports no flame
signal
25 No flame signal after
the safety time; the
ionisation flame mon-
itor reports no flame
signal
25 No flame signal after
the safety time; the
ionisation flame mon-
itor reports no flame
signal
25 No flame signal after
the safety time; the
ionisation flame mon-
itor reports no flame
signal
42
Cause
Gas shut-off valve
closed, gas pres-
sure limiter faulty
Ionisation elec-
trode incorrectly
adjusted
Ignition electrodes
incorrectly adjus-
ted
Insulation body of
ignition electrodes
cracked
Incorrect gas type
selected
Gas train does not
open
Combustion char-
acteristics not
ideal
Incorrect parame-
ter set selected
Measures
Open the gas shut-off
valve and check the gas
supply pressure; clean
the gas filter if required
Adjust the ionisation elec-
trode (see page 24).
Adjust the ignition electro-
des (see page 24)
Replace the ignition elec-
trodes
Adjust the gas type (see
page 9)
Check the gas train and
replace if required
Adjust the burner (see
from page 14)
Adjust the parameter set
(see page 37 to 38).