Viessmann VITOCROSSAL 200 Service Instructions Manual page 42

Troubleshooting
Diagnosis
(cont.)
Fault code System character-
istics
F A6 The ionisation flame
monitor reports ex-
ternal light ingress
during the start or
after the post-purge
F A6 The ionisation flame
monitor reports ex-
ternal light ingress
during the start or
after the post-purge
F A7 No flame signal dur-
ing the safety time;
the ionisation flame
monitor reports no
flame signal
F A7 No flame signal dur-
ing the safety time;
the ionisation flame
monitor reports no
flame signal
F A7 No flame signal dur-
ing the safety time;
the ionisation flame
monitor reports no
flame signal
F A7 No flame signal dur-
ing the safety time;
the ionisation flame
monitor reports no
flame signal
F A7 No flame signal dur-
ing the safety time;
the ionisation flame
monitor reports no
flame signal
42
Cause Measures
Gas train not gas- Replace the gas train
tight; gas is es-
caping and burn-
ing
Incorrect para- Set parameters; replace
meter set se- parameter memory stick
lected if required and enable
Ionisation elec- Adjust the ionisation
trode incorrectly electrode (see page 23);
adjusted; ionisa- plug in ionisation elec-
tion cable not trode
plugged in
Ignition electro- Adjust the ignition elec-
des incorrectly trodes (see page 23)
adjusted
Insulation body of Replace the ignition
the ignition elec- electrodes
trodes cracked
Incorrect gas type Adjust the gas type (see
selected page 10)
The gas train Check the gas train and
does not open replace if required