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10 Troubleshooting
Logano plus GB402 – 6 720 804 428 (2012/09)
47
B 5L 543 No
communication
with the SAFe.
The MC10 does not
receive data from the
SAFe.
Check whether the cable plugs
(BUS cable and power cable)
between SAFe and MC10 are
correctly plugged in.
Refit plug it is found to be
loose.
Check in the MC10 at terminals
"Mains SAFe" whether 230 V are
present.
Replace the MC10 if there are
not 230 V.
Check whether the cables (BUS
cable and power cable) between
the SAFe and the MC10 are
damaged.
Replace cable.
Check whether the green
indicator illuminates on the SAFe.
Replace the SAFe if the
indicator does not illuminate.
Separate the BUS cable between
SAFe and MC10 and check
whether the boiler enters
emergency mode (runs at 60 °C
boiler water temperature).
Replace the SAFe if the boiler
does not start.
Make replacements to check
whether it is the SAFe or the
MC10 that is faulty.
Replace the SAFe or MC10.
If the SAFe remains dark, wait a
short time as the appliance will
not start up if the SAFe is cold.
Wait up to 30 minutes and
check whether the green
indicator on the SAFe
illuminates again. Replace the
SAFe if that is not the case.
B 6L 515 Ionisation signal
failure during
operation.
Ionisation signal failure
during burner
operation.
- None; the SAFe will try a
restart.
B 6L 514 Flame torn off
within the flame
stabilisation time.
No flame signal was
detected within the
stabilisation time.
- None; the SAFe will try a
restart.
V 6C 576 Ionisation current
within the pre-
purge time
> 0.9 μA.
A flame signal was
detected during the
pre-purge time.
Check the ionisation electrode.
Ensure that the metal fibres of the
burner gauze have no contact with
the electrodes.
Check gas train function.
Check electrode gap on the
ionisation electrode.
Replace ionisation electrode.
Replace gas train.
Type
1)
Display
code
Fault code Cause Description Test procedure/cause Correction
Tab. 22 Fault displays
1) V = locking; B = blocking
47


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