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Display flashes (item 4, fig. 4)/LED on (item 6, fig. 4).
All other codes result from internal faults.
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0
Incorrect fan speed during
preventilation phase
Check parameter DA3
2
Overheat thermostat or flue gas
thermostat activated
Check water pressure and flow (Pmin. = 1 bar).
Purge the installation correctly
4
Flame fault or premature flame signal
- The flame does not appear: no gas, gas valve will
not open, significant gas valve adjustment error,
defective HT transformer, HT lead, or HT
electrode
- The flame only appears for 3 seconds: Live/
neutral reversed, defective ionisation probe or
ionisation probe lead
5
Incorrect fan speed at maximum load
Check parameter DA4
6
Fan speed rise time too long
Check that the fan is able to rotate freely
9
A
Maximum fan speed exceeded during
preventilation phase
- Check mains voltage (too high)
- Check that neither the flue nor the fan air inlet are
blocked
- Check parameters DA
H
Boiler sensor circuit broken
Replace boiler sensor
L
Boiler sensor circuit broken
Replace boiler sensor
C
Boiler water pressure too low
- Check the water pressure in the heating circuit
- Check that the pressure sensor is working -
accessed by removing the plastic cover
