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5. appliance protection devices
5. Appliance shut-off conditions
The appliance is protected from malfunctions by means of
internal checks performed by the electronic P.C.B., which
stops the appliance from operating if necessary.
In the event of the appliance being shut off in this manner, a
code appears on the control panel display which refers to the
type of shut-off and the reason behind it.
Switch off the appliance. Make sure the external electric
isolation switch is in the OFF position, shut off the gas isolation
valve and contact a qualifi ed technician.
5.1. Table summarising error codes
Error code
Description
Control board - no display, after pressing the ON button
- There is no electrical supply
Verify the electrical connection to the main unit
- Problem detected on the electronic card or fuse
Replace the card or fuse.
A 1
A 1
No fl ame detected
- Gas isolation valve closed
Open the valve and follow the activation procedure
- Check the ignition electrode
- Check the detection electrode
A 2
A 2
Overheating
- A temperature higher than 85°C has been
detected.
Check the water pressure
A 3
A 3
Air pressure switch error
The error is indicated by the symbol
to follow
the display shows the code
- Check the air pressure switch
- Check the fan
A 4
A 4
Flame lift
- Check the ignition electrode
- Check the detection electrode
- Check the supply voltage of the card
- Check the gas supply pressure
- Check the fl ue installation
A 5
A 5
Fan speed error
A 6
A 6
Hot water temperature
sensor error
- Check the Hot Water temperature sensor
A 7
A 7
Cold water temperature sensor error
- Check the Cold Water temperature sensor
