41
Fault code dis-
played
System characteristics
Cause
Measures
F b7
Burner control unit in a fault
state; system cooling down;
burner control unit locked out.
Coding card not inserted
in the burner control unit;
incorrect or faulty coding
card
Insert coding card; check coding
card, replace if required.
F b7
Type of coding card
Coding card does not
match burner control unit.
Replace coding card or burner
control unit.
Danger
Plug-in terminals on the
burner control unit are live.
Only replace the coding card
when the burner control unit
has been isolated from the
power supply.
F E4
Burner shuts down.
Multiple detection of un-
dervoltage with recurrence
and renewed undervolt-
age
Check the power supply.
F E5
Burner control unit in a fault
state
Internal fault of the burner
control unit and during test
of ionisation input
Replace burner control unit.
F EC
Burner control unit in a fault
state
Internal error in feedback
from safety relay.
Reset the burner control unit. Re-
place burner control unit if re-
quired.
F ED
Burner control unit in a fault
state
Internal error in feedback
from ignition relay.
Reset the burner control unit. Re-
place burner control unit if re-
quired.
F EE
Burner control unit in a fault
state
Internal error in feedback
from gas safety valves.
The output relay does not
respond.
Reset burner control unit; replace
burner control unit.
F EF
Burner control unit in a fault
state
Internal error in feedback
from gas safety valves.
The output relay does not
respond.
Reset burner control unit; replace
burner control unit.
F F3
Ionisation flame monitor re-
ports faulty flame signal dur-
ing start-up or after the post-
purge.
Gas train not gas-tight
(gas is escaping and burn-
ing); incorrect coding card.
Check ionisation path; replace cod-
ing card; replace gas train.
F F4
No flame formation during
safety time; ionisation flame
monitor reports no flame sig-
nal.
Ionisation electrode incor-
rectly adjusted, ionisation
electrode not plugged in.
Earth fault of electrode or
cable
Insert plug of ionisation electrode;
check cable; adjust ionisation elec-
trode (see page 23).
F F4
No flame formation during
safety time; ionisation flame
monitor reports no flame sig-
nal.
Ignition electrodes incor-
rectly adjusted, electrode
earth fault, ignition unit
faulty, burner control unit
faulty
Adjust ignition electrodes (see
page 23); replace ignition unit; re-
place burner control unit.
F F4
No flame formation during
safety time; ionisation flame
monitor reports no flame sig-
nal.
Insulation body of ignition
or ionisation electrode
cracked
Replace ignition or ionisation elec-
trode.
Troubleshooting
Fault codes
(cont.)
5812086
Diagnosis
Содержание CM2B
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