Buderus LOGANO PLUS GB312 Installation Instructions Manual page 56

10
Troubleshooting
Display
1)
Type code Fault code
V 4A 575
K 5L 542
K 5L 543
K 6L 515
K 6L 514
V 6C 576
Table 22 Fault messages
1) V = locking; B = inhibiting; BC = operating code
56
Cause Description
ISTB response. The boiler flow
temperature has
reached its maximum
permissible level.
Incomplete communication The MC10 registers this
with SAFe. fault if not all required
data is supplied by the
SAFe.
No communication with The MC10 is not
SAFe. receiving any data from
the SAFe.
Loss of ionization signal Ionization signal is lost
when boiler is running. when the burner is in
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.
Testing sequence/
Cause Measure
High temperature safety Check gas valve.
cut-out has tripped.
Check wiring connections If connections OK,
between SAFe and replace SAFe
MC10.
Check whether the If connector is loose,
connecting leads (bus reconnect properly.
lead and power lead)
If 120 V is not present,
between the SAFe and
the MC10 is defective
the MC10 are properly
and must be replaced.
connected.
Replace connecting
On the MC10, check
lead.
whether 120 V is present
If the lamp is not lit, the
at the "Netz SAFe"
SAFe is probably
terminals.
defective and should be
Check whether the
replaced.
connecting leads (bus
If the boiler does not
lead and power lead)
start up, the SAFe is
between SAFe and MC10
defective and must be
are damaged.
replaced.
Check whether the green
Replace SAFe/MC10.
indicator lamp on the
SAFe is lit.
Disconnect the bus lead
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.
Make sure that metal Replace ionization
fibers of propane burner electrode.
are not in contact with
with electrodes.
Check function of gas Replace gas valve.
valve.
Logano plus GB312 – 6 720 647 367 (2012/11)