Buderus Logano plus GB312 Installation And Service Instructions Manual page 55

1)
Type Display code Fault code
K 5L 543
K 6L 515
K 6L 514
V 6C 576
Table 23 Fault displays
1) V = interlocking; B = inhibiting; BC = operating code
Logano plus GB312 – 6 720 806 273 (2013/01)
Cause Description
No communication with The MC10 is not
SAFe. receiving any data from
the SAFe.
Failure of the ionization Ionization signal is lost
signal during operation. during burner operation.
Flame failure during the No flame signal was
flame stabilization period. detected within the
flame stabilization
period.
Ionization current > 0.9 μA No flame signal was
during preventilation. detected within the
preventilation phase.
Troubleshooting
Testing sequence/ Measure
Cause
Check whether the plugs If connector is loose,
on the cables (bus reconnect properly.
connecting cable and
If 120 V is not present,
power cable) between
the MC10 is defective
the SAFe and the MC10
and must be replaced.
are properly connected.
Replace connecting
On the MC10, check
cable.
whether 120 V is present
If the LED is not lit, the
at the "Power SAFe"
SAFe is probably
terminals.
defective and should be
Check whether the
replaced.
connecting cables (bus
If the boiler does not
cable and power cable)
start up, the SAFe is
between the SAFe and
defective and must be
the MC10 are damaged.
replaced.
Check whether the green
Replace the SAFe or
indicator lamp on the
MC10.
SAFe is lit.
Disconnect the bus cable
and check whether the
boiler goes into
emergency mode (runs
up to boiler temperature
of approx. 140 °F
(60 °C)).
Check whether the SAFe
or the MC10 is defective
by replacing them.
- None; the SAFe will
initiate a restart.
- None; the SAFe will
initiate a restart.
Check ionization Check ionization
electrode. electrode gap.
Replace ionization
Make sure that metal electrode.
fibers of propane burner
are not in contact with
with electrodes.
Check function of gas Replace gas valve.
valve.
10
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