19
Cause 4 : the overheating probe of the exchanger go to a default state.
- The probe is compound of 2 resistances. Measure the resistance of each element.
The resistance values shall be 20kΩ at 25° and 25kΩ at 20°.
If they are varying too much, or if the difference between the 2 resistances is too big, replace
the probe.
- Do a rotation of a quarter turn of the probe (on its axis) in order to modify the surface of contact
where the temperature is measured.
Cause 5 : Flame default in repetition during the operation.
- Bad earth connection of the heater.
- The setting of the gas valve is not correct. Modify the setting (page 15).
- The combustion products duct is obstructed
Cause 6 : The premix is not starting.
- The premix is blocked: check the burner fan.
- The premix is under tension: check the wiring
Cause 7 : The premix is operating but not the appropriate speed.
- Check if the premix is not dirty.
- Check if the premix can turn freely.
- Check the electric wiring. (see the scheme at page 24 and 25)
Cause 8 : The identification of the appliance is not correct
- Check if the identification resistances are well connected on the control board. If necessary, replace
the identification resistances.
Cause 9 : Trouble when rearming the appliance.
- If in a short time, the rearming button was pressed to often, this default will disappear after some
time. By cutting the electric supply, this problem will be solved.
Cause 10 : The control board is not reacting.
- The J4 connector is not well engaged or there is a bad electrical connection between the terminals 5
and 11 of this connector.
- The control board is defective, replace it
- One of the 2 fuses is defective, replace it
Cause 11 : The combustion air through the heat exchange is not sufficient
- Check if there is no air leak inside the exchanger.
- Check the connection of the pressure switch and its operation.
Cause 12 : The exhaust gases sensor detects an error.
- The temperature of exhaust gases > 120°C, check the CO and CO
2
values.
Check the settings of the gas valve (page 17)
- Bad connection of the temperature sensor: check the wiring
- Defective temperature sensor: the value of the resistance shall be 20kΩ at 25° and 25kΩ at 20°.
The warm air heater is working but there are other troubles
There is a detonated ignition of the burner.
- Check the gas valve setting: a proper CO2 level in the combustion products at high and low speed is
important for a good ignition.
- Check the ignition cable.
- Check the position of the ignition electrode, sparkling shall take place between the 2 electrodes and
not between an electrode and the burner.
Insufficient output of the heater.
- The heat provided by the appliance will be not sufficient if the pressure drops in the duct are too high.
In good conditions, the pressure drops of the exhaust gases are not greater than 30 Pa.
The main fan is not working or the rotation speed is not varying.
- Check the operation of the main fan by connecting it directly to the 230V. If the fan is working
properly, it means that the problem is coming from the control board because it sets the rotation
speed of the main fan between 800 and 1300 tr/mn. Replace the control board.
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