Buderus Logano plus GB402 Installation And Maintenance Instructions For Contractors page 51

1)
Type Display code Fault Code
B 6A 577
V 6L 561
B 7A 550
B 7A 551
B 7P 549
Table 23 Fault displays
1) V = locking; B = blocking
Logano plus GB402 – 6 720 820 700 (2018/01)
Reason Description:
No flame within Ionisation current
the safety time. within the safety time is
< 1.1 μA.
"Power up" 5 The burner control unit
times (power was switched off 5
interruption times during the burner
during burner start.
start).
Undervoltage. The mains voltage is
too low.
Voltage There has been a brief
interruption. interruption in the
mains voltage.
The safety chain The continuity of the
has opened. external components,
which are integrated in
the MC10 safety chain
has been interrupted.
Test procedure/cause
Gas supply pressure too low.
The gas governor is not adjusted
to the required gas volume.
Inadequately sized gas line
cross-sections (min.
cross-section of the gas supply
pipe).
Air in the gas line.
Back-pressure of the flue system
is too high due to an unfavourable
layout (too many deflections;
cross-sections too small or too
long; horizontal sections too
long).
Ignition/ionisation electrode
dirty.
Check cabling between the SAFe
and the ionisation electrode for
contact separation, breaks and
damage.
Check the electrode clearances
and ignition/ionisation electrode
for damage.
Check cabling between the
ignition transformer and ignition
electrode for contact separation
(on electrode and transformer),
breaks and damage.
SAFe burner control unit faulty.
Ignition transformer faulty (no
ignition spark or delayed ignition
spark, "hard start").
Check the 230 V power supply to
the control unit.
The mains voltage must not fall
below 195 V.
Check the mains cable for
possible loose contacts.
Check the wiring and correct
contacts of the mains plug at the
MC10 or SAFe.
Check the continuity of the
components.
Troubleshooting 11
Corrective measure
Notify the gas supplier if the
pressure is too low.
Install gas governor that is
adjusted to the required gas
volume or, if necessary, notify
gas supplier.
Install adequately sized gas
lines.
Vent the gas line.
Size and route the flue system
correctly.
Clean or replace ignition/
ionisation electrode.
Establish the contacts
correctly. Replace cable if
required.
Align burner rod or electrode.
Replace faulty electrode.
Establish the contacts
correctly. Replace cable if
required.
Replace the SAFe.
Replace the ignition
transformer.
Reset burner control unit.
Remedy the problem in the
power supply.
Ensure the correct power
supply.
Remedy any contact problems.
If required, replace faulty
components.
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