F.74 - Water pressure sensor signal too high

What does F.74 mean?

The water pressure sensor is sending a signal that is too high or outside the correct range. This could be due to a short circuit in the wiring or an internal sensor fault.

• The line to the water pressure sensor has a short circuit to 5 V/24 V.
• Internal fault within the water pressure sensor itself.

Click steps to track your progress.

1. 1

   Press the reset button on the boiler display up to three times to try and clear the fault.

2. 2

   Contact customer service. This fault indicates the water pressure sensor signal is too high, possibly due to a short circuit in its wiring or an internal sensor fault.

3. 3

   A qualified technician will need to diagnose the sensor and its electrical connections.