Viessmann VITOCROSSAL 200 Service Instructions Manual page 43

Diagnosis
(cont.)
Fault Display
code *1
F A2 9
F A3 c00
F A4 and F A4 and
F A5 F A5
F A6 F A6
F A7 F A7
F A7 F A7
F A7 F A7
*1 All fault codes are saved to the fault memory and the last 10 can be called up.
System charac-
teristics
Burner control unit
in fault state
No password
entered for param-
eter memory stick
within 3 min
Burner control unit
in fault state
Ionisation flame
monitor reports
external light
ingress during the
start or after the
post-purge
No flame signal
during safety time;
ionisation flame
monitor reports no
flame signal
No flame signal
during safety time;
ionisation flame
monitor reports no
flame signal
No flame signal
during safety time;
ionisation flame
monitor reports no
flame signal
Cause
Interruption -
safety chain has
been opened
(strapping plug
fJ)
Values in burner
control unit and
parameter mem-
ory stick are differ-
ent; timeout
because pass-
word not entered
Internal error in
feedback from
gas safety valves;
output relay does
not respond
Gas train not gas-
tight; gas is
escaping and
burning
Ionisation elec-
trode incorrectly
adjusted; ionisa-
tion cable not
plugged in
Ignition electro-
des incorrectly
adjusted
Insulation body of
ignition electrodes
cracked
Troubleshooting
Measure
Check safety chain
(strapping plug
fJ)
Enter password.
See installation
instructions, burner
components
Replace burner
control unit
Replacing the gas
train
Adjust ionisation
electrode (see
page 24); push
plug onto ionisa-
tion electrode
Adjust ignition
electrodes (see
page 24)
Replace ignition
electrodes
43