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7. TROUBLESHOOTING
7.1 Generality
In order to facilitate the fault detection, the display on the control board indicates a code which
corresponds to a diagnosis. On the MULTITHERM screen will appear a code too.
(See the diagnosis list below).
Take care of the reaction time of the heater (do not react too quickly!) as well as the warning LED.
Cause of default conducting to a safety state of the appliance and requiring rearming.
Display
Alternatively A and 0
Alternatively A and 1
Alternatively A and 2
Alternatively A and 3
Alternatively A and 4
Alternatively A and 5
Alternatively A and 6
Alternatively A and 7
Alternatively A and 8
Alternatively A and 9
Cause of default conducting to a safety state.
After removing the defective part, the appliance will work again.
Display
Alternatively E and 0
Alternatively E and 1
Alternatively E and 2
Alternatively E and 3
Alternatively E and 9
Cause 1 : While 5 seconds, presence of flame then the flame disappears.
- The flame is not detected. Check the ionisation probe and the cable.
(Electrical resistance shall be around 1 kΏ)
- Bad earth connection, hence a too weak ionisation current.
- The control board is defective, replace it
Cause 2 : No flame.
- No gas or gas pressure too weak. Check the gas pressure upstream the gas valve.
- The mix air/gas is not correct. Check the setting of the gas valve (page 15).
- The gas valve is not opening. Check, while sparkling that the electric supply of the gas valve is 230V.
- Check if there is sparks. Remove if necessary the ionisation probe or cable.
Cause 3 : Overheating of the exchanger.
- Overheating of the exchanger: check if the main fan is operating normally.
- Check the setting of the gas valve (page 15)
Default
Internal default
Defective control board, replace it
Ignition default
While 5 seconds, presence of flame then the flame disappears :
Cause 1
No flame : Cause 2
Overheating default state of the heat exchanger: Cause 3
Overheating of the
exchanger
Default of the
The overheating probe of the exchanger go to a default state:
overheating probe
Cause 4
Flame default
Flame default in repetition during the operation: Causes 1 or 5
Internal default
Defective control board, replace it
Default of the
Default of the electric connection: Cause 10
overheating probe
Flame detection
Ionisation without presence of flame :
check the electrode and the cable
Pre-mix default
The premix is not starting: Cause 6
The premix is operating: Cause 7
The burner fan is not working: Cause 6
Pressure switch
default
The burner fan is working: Cause 7
The combustion air through the heat exchange is not sufficient:
Cause 11
Default
Internal default
Defective control board, replace it
st
1
overheating probe
Overheating of the exchanger, after cooling, the appliance will
restart: Cause 3
Appliance
The identification of the appliance is not correct: Cause 8
identification default
Appliance
The identification of the device is not correct: Cause 8
identification default
Problème lors du
Repetition of the rearms in a short time: Cause 9
réarmement
Cause / Solution
Cause / Solution
18
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