73
354
System characteristics
Burner in a fault state
Cause
Gas modulation valve tolerance outside permissible
range
Measures
Replace gas fan unit.
355
System characteristics
Burner in a fault state
Cause
Analogue signal reference check: Flame signal is
already present at burner start.
Measures
Replace the HBMU heat management unit. See chap-
ter "Replacing the HBMU heat management unit".
359
System characteristics
Burner in a fault state
Cause
No ignition spark
Measures
■
Check whether the ignition electrode insulation is
damaged.
■
Check for a voltage of 230 V∼ at the ignition module
during the ignition phase. If not, replace the HBMU
heat management unit.
■
If 230 V~ is present at the ignition module but there
is still a fault, replace the ignition module.
■
Check connecting cables and leads from ignition
module and ignition electrode.
Reset the appliance.
361
System characteristics
Burner in a fault state
Cause
Flame signal is not present or insufficient at burner
start.
Measures
Check ionisation electrode and connecting cable.
Check plug-in connections for loose contacts.
Note
Deposits on the electrodes indicate foreign bodies in
the combustion air. Check the installation room and
flue system for causes of the deposits. For example:
Laundry detergents, cleaning agents, toiletries, depos-
its in the ventilation air supply (chimney)
Reset the appliance.
Troubleshooting
Fault messages (cont.)
6221465
Diagnosis
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