Buderus Logano plus GB402 Installation And Maintenance Instructions Manual page 61

Display Fault
1)
Type code code
B 5L 543
B 6L 515
B 6L 514
V 6C 576
Tab. 21 Fault displays
1) V = interlocking; B = blocking
Logano plus GB402 - Subject to technical modifications!
Cause Description
No communi- The MC10 does
cation with not receive data
the SAFe. from the SAFe.
Ionisation Ionisation signal
signal failure failure during
during burner operation.
operation.
Flame torn off No flame signal
within the was detected
flame within the
stabilisation stabilisation time.
time.
Ionisation A flame signal was
current within detected during
the pre-purge the pre-purge time.
time > 0.9 μA.
Test procedure/cause
Check whether the cable
plugs (BUS cable and
power cable) between
SAFe and MC10 are
correctly plugged in.
Check in the MC10 at
terminals "Mains SAFe"
whether 230 V are present.
Check whether the cables
(BUS cable and power
cable) between the SAFe
and the MC10 are
damaged.
Check whether the green
indicator illuminates on the
SAFe.
Separate the BUS cable
between SAFe and MC10
and check whether the
boiler enters emergency
mode (runs at 60 °C boiler
water temperature).
Make replacements to
check whether it is the
SAFe or the MC10 that is
faulty.
If the SAFe remains dark,
wait a short time as the
appliance will not start up if
the SAFe is cold.
-
-
Check the ionisation
electrode.
Ensure that the metal fibres
of the burner gauze have no
contact with the electrodes.
Check gas valve function.
10
Troubleshooting
Action
Refit plug it is found to
be loose.
Replace the MC10 if
there are not 230 V.
Replace cable.
Replace the SAFe if the
indicator does not
illuminate.
Replace the SAFe if the
boiler does not start.
Replace the SAFe or
MC10.
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.
None; the SAFe will try a
restart.
None; the SAFe will try a
restart.
Check electrode gap on
the ionisation electrode.
Replace ionisation
electrode.
Replace gas valve.
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