A04 Water shortage alarm warn that water is not detected.
As consequence units open water solenoid and show the message after a short delay.
This message does not necessarily require the intervention of a technician; the causes of the failure can be external.
Description
Pressure switch PA for direct injection units; level probes for boiler units do not detect water presence.
Warning
On boiler units water must be conductive >50µS
On direct injection units water pressure must be >50Kpa
Reset
Message reset automatically.
In case of PA defect is possible to deactivate it from: Service Level / oven model / pressupre switch: OFF
Checks
Perform following checks:- Check opening of water tap with the hand shower if present
- Check if water pressure is adequate.
- Check solenoid valve S1 (out 35) or S2 (out 53).
- Check pressure switch PA.
- Check if water is conductive.
- Check boiler level probes.
- Check if drain valve close.