geminox THR 10-100 Series - Page 80

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- the alarm indicator (item no. 6, fig. 73) is lit,
- the display (item no. 4, fig. 73) flashes.
Note:
- All other alarm codes signal an internal fault
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Ventilator speed incorrect in
preventilation phase
DA3 parameter to be checked
Overheating thermostat activated or
flue gas thermostat activated
Check the water flow rate and pressure (min.P: 1
bar)
Bleed the installation properly
Flame fault or premature flame
signal
- The flame does not appear: no gas, gas valve
does not open, substantial gas valve setting fault,
high voltage transformer defective, high voltage
cable dead, high voltage electrode defective
- The flame only appears for 3 seconds: Live-
Neutral inversion , ionising electrode defective,
ionising electrode cable defective
Ventilator speed incorrect at
maximum load
Parameter DA4 to be checked
Ventilator start-up time too long Check that the ventilator’s rotation is not hindered
Maximum ventilator speed
overshoot during the preventilation
phase
- Check mains voltage (too high)
- Check that the flue or the ventilator air inlet are
not obstructed
- Parameter DA to be checked
Boiler sensor interruption Replace the sensor
Boiler sensor interruption Replace the sensor
Insufficient boiler water pressure - Check the heating circuit water pressure
- Check the operation of the pressure-mechanism
sensor that can accessed when the plastic cover
is removed.