F.75 - No pressure change detected when pump starts

What does F.75 mean?

The boiler has failed to detect a change in water pressure when the pump started, indicating a potential issue with the pump, water levels, or air in the system.

• Water pressure sensor and/or pump is defective.
• Air present in the heating installation.
• Insufficient water in the product.
• Adjustable bypass needs checking, or external expansion vessel needs connecting to the return.

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

   Check the system pressure and ensure there is sufficient water in the heating installation. Top up if necessary according to your user manual.

3. 3

   Bleed air from the heating installation and radiators if you suspect air is trapped in the system.

4. 4

   If the fault persists, contact customer service as the water pressure sensor or pump may be defective.