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10 Troubleshooting
Logano plus GB402 – 6 720 804 428 (2012/09)
48
B 6A 577 No flame within
the safety time.
Ionisation current
within the safety time
<1.A.
Gas supply pressure too low. Notify gas supplier if the supply
pressure is too low.
The gas governor is not adjusted
to the required gas volume.
Install gas governor that is
adjusted to the required gas
volume or, if necessary, notify
gas supplier.
Inadequately sized gas line cross-
sections (min. cross-section of
the gas supply pipe).
Install adequately sized gas
lines.
Air in the gas line. Purge the gas line.
Excessively high flue system
backpressure through
unfavourable layout (too many
diversions; cross-section
inadequate or too long; horizontal
sections too long).
Size and route the flue system
correctly.
Ignition/ionisation electrode
contaminated.
Clean or replace ignition/
ionisation electrode.
Check cabling between the SAFe
and the ionisation electrode for
contact separation, breaks and
damage.
Make the contacts correctly.
Replace cable if required.
Check electrode gaps and
ignition/ionisation electrode for
damage.
Align burner rod or electrode.
Replace faulty electrode.
Check cabling between the
ignition transformer and ignition
electrode for contact separation
(on electrode and transformer),
breaks and damage.
Make the contacts correctly.
Replace cable if required.
SAFe burner control unit faulty. Replace the SAFe.
Ignition transformer faulty (no or
delayed ignition spark, "hard
start").
Replace the ignition
transformer.
V 6L 561 "Power up"
5 times (power
interruption
during burner
start).
The burner control unit
was switched off 5
times during the burner
start.
Check the 230 V power supply to
the control unit.
Reset burner control unit.
Remedy problem with the
power supply.
B 7A 550 Undervoltage. The mains voltage is
too low.
The power supply must not fall
below 195 V.
Ensure the correct power
supply.
B 7A 551 Voltage
interruption.
There has been a brief
power failure.
Check the power cable for
possible loose contacts.
Check the wiring and correct
contacts of the mains plug at the
MC10 or SAFe.
Remedy any contact problems.
B 7P 549 The safety chain
has opened.
The continuity of the
external components
tied into the MC10
safety chain has been
interrupted.
Check the continuity of the
components.
If required, replace faulty
components.
Type
1)
Display
code
Fault code Cause Description Test procedure/cause Correction
Tab. 22 Fault displays
1) V = locking; B = blocking
48


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