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41. Troubleshooting
Fault
code
Fault
Possible causes
Remedy
56
Calibration factory limit
Calibration factory limit (minimum) not
reached
Flue gas recirculation
Ionisation electrode corroded/bent
Wiring error on HCM-2 (low voltage
side)
Flue gas recirculation:
- Check the flue path inside and outside the
appliance (leaking, blocked).
Have customer service set IO default value
to factory setting.
Ionisation electrode:
- Electrical wiring and connections.
- Check the condition of the electrode, clean
or replace if necessary.
- Adjust gap and position or replace if neces-
sary.
Check burner earthing.
Press reset button.
Check the electrical connection of the HCM-2
low voltage side
57
Calibration discrepancy
Ionisation electrode corroded/bent
Soot or dirt particles in the intake air
Flue gas recirculation
Wiring error on HCM-2 (low voltage
side)
Intake air:
- Soot or dirt particles in the intake air cause
a calibration discrepancy (be aware of this
in cases of room-sealed operation).
Ionisation electrode:
- Check electrical wiring and connections.
- Check the condition of the electrode, clean
or replace if necessary.
- Adjust gap and position or replace if neces-
sary.
- Carry out 100 % calibration.
Replace boiler coding card
Check the electrical connection of the HCM-2
low voltage side
58
Timeout calibration
The heating appliance cannot carry out
calibration
Flue gas recirculation
Fan faulty
Inadequate heat transfer
Wiring error on HCM-2 (low voltage
side)
Flue gas recirculation:
- Check the flue path inside and outside the
appliance (leaking, blocked).
Fan:
Check that the fan and its wiring are intact.
Inadequate heat transfer:
- Ensure adequate heat transfer,
Open heating circuits.
Check IO electrode.
Press reset button.
Check the electrical connection of the HCM-2
low voltage side
59
Calibration factory limit
Calibration factory limit (maximum)
exceeded
Soot or dirt particles in the intake air
Flue gas recirculation
Wiring error on HCM-2 (low voltage
side)
Intake air:
Soot particles or other dirt particles in the
intake air (be aware of this in cases of room-
sealed operation).
Tightness test
Have customer service set IO default value
to factory setting.
Check the electrical connection of the HCM-2
low voltage side
Summary of Contents for CGB-2 Series
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