102
Displayed
fault code
System characteris-
tics
Cause
Measures
Eb
Burner in a fault
state
Repeated flame
loss during calibra-
tion
Check gap between ioni-
sation electrode and
burner gauze assembly
(see page 21).
Check allocation of gas
type (see page 12).
Check flue system; rem-
edy flue gas recirculation
if required.
Press reset button
R
EC
Burner in a fault
state
Parameter fault
during calibration
Press reset button
R
or
Replace boiler coding
card and press reset but-
ton
R
.
Ed
Burner in a fault
state
Internal fault
Replace control unit
EE
Burner in a fault
state
Flame signal is not
present or too
weak at burner
start
Check gas supply (gas
pressure and gas flow lim-
iter);
Check gas train.
Check ionisation elec-
trode and connecting
cable.
Check ignition:
■ Connecting leads to
ignition module and
ignition electrode
■ Distance to ignition
electrode and contami-
nation (see page 21).
Check condensate drain.
Press reset button
R
Troubleshooting
Fault codes
(cont.)
5692 860 GB
Summary of Contents for CU3A
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