Buderus Logano plus GB312 Installation And Maintenance Instructions Manual page 64

10
Troubleshooting
Display Fault
1)
Type code code
B 6A 577
Tab. 28 Fault displays
1) V = locking; B = blocking
64
Cause Description
No flame Ionisation current
within the within the safety
safety time. time < 1.1 μA.
Test procedure/cause
Gas supply pressure too
low.
The gas governor is not
adjusted to the required
gas volume.
Inadequate gas line cross-
sections (min. gas line
cross-section)
Air in the gas line.
Excessively high flue
system backpressure
through unfavourable
layout (too many
diversions; cross-section
inadequate or too long;
horizontal sections too
long).
Ignition/ionisation
electrode contaminated.
Check cabling between the
SAFe and the ionisation
electrode for contact
separation, breaks and
damage.
Check electrode gaps 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 or delayed ignition
spark, "hard start").
Logano plus GB312 - Subject to technical modifications.
Action
Notify gas supply utility if
the supply pressure is
too low.
Install gas governor that
is adjusted to the
required gas volume or,
if necessary, notify gas
supply utility.
Install adequately sized
gas lines.
Purge the gas line.
Size and route the flue
system correctly.
Clean or replace
ignition/ionisation
electrode.
Make the contacts
correctly. Replace cable
if required.
Align burner rod or
electrode. Replace
faulty electrode.
Make the contacts
correctly. Replace cable
if required.
Replace the SAFe.
Replace the ignition
transformer.