43
Fault
code
*1
Display
System charac-
teristics
Cause
Measure
F A2
9
Burner control unit
in fault state
Interruption -
safety chain has
been opened
(strapping plug
fJ
)
Check safety chain
(strapping plug
fJ
)
F A3
c00
No password
entered for param-
eter memory stick
within 3 min
Values in burner
control unit and
parameter mem-
ory stick are differ-
ent; timeout
because pass-
word not entered
Enter password.
See installation
instructions, burner
components
F A4 and
F A5
F A4 and
F A5
Burner control unit
in fault state
Internal error in
feedback from
gas safety valves;
output relay does
not respond
Replace burner
control unit
F A6
F A6
Ionisation flame
monitor reports
external light
ingress during the
start or after the
post-purge
Gas train not gas-
tight; gas is
escaping and
burning
Replacing the gas
train
F A7
F A7
No flame signal
during safety time;
ionisation flame
monitor reports no
flame signal
Ionisation elec-
trode incorrectly
adjusted; ionisa-
tion cable not
plugged in
Adjust ionisation
electrode (see
page 24); push
plug onto ionisa-
tion electrode
F A7
F A7
No flame signal
during safety time;
ionisation flame
monitor reports no
flame signal
Ignition electro-
des incorrectly
adjusted
Adjust ignition
electrodes (see
page 24)
F A7
F A7
No flame signal
during safety time;
ionisation flame
monitor reports no
flame signal
Insulation body of
ignition electrodes
cracked
Replace ignition
electrodes
*1
All fault codes are saved to the fault memory and the last 10 can be called up.
Troubleshooting
Diagnosis
(cont.)
5692 908 GB