76
Measures
■
Check ionisation electrode and connecting cable.
■
Check plug-in connections for loose contacts. Check
the flue system. Remove flue gas recirculation if nec-
essary.
■
Check system for condensate backup. Visually
check gas solenoid valve inlet and inlet strainer for
contamination.
Note
To prevent water damage, detach fan unit before
removing the burner.
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,
deposits in the ventilation air supply (chimney).
If burner gauze assembly and ionisation electrode
have been replaced, also clean fan unit, gas/air
channel and Venturi extension.
Reset the appliance.
375
System characteristics
Burner restarts.
Cause
Performing ionisation current calibration: Calibration
not performed. Minimum value or termination criterion
not reached.
Measures
■
Check ionisation electrode and connecting cable.
■
Check plug-in connections for loose contacts. Check
the flue system. Remove flue gas recirculation if nec-
essary.
■
Check system for condensate backup. Visually
check gas solenoid valve inlet and inlet strainer for
contamination.
Note
To prevent water damage, detach fan unit before
removing the burner.
Deposits on the electrodes indicate foreign bodies in
the combustion air. Check the installation room and
flue system for causes of the deposits (e.g. laundry
detergents, cleaning agents, toiletries or deposits in
the ventilation air supply/chimney).
If burner gauze assembly and ionisation electrode
have been replaced, also clean fan unit, gas/air
channel and Venturi extension.
■
Reset the appliance.
376
System characteristics
Burner in a fault state
Cause
Ionisation current differential compared to previous
value not plausible.
Troubleshooting
Fault messages (cont.)
6221465
Diagnosis
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