F.22 - Safety switch-off: Low water pressure

What does F.22 mean?

The boiler has performed a safety shutdown due to low water pressure in the heating system. This means there is not enough water for safe operation.

• No or insufficient water in the boiler or heating system.
• The water pressure sensor is defective.
• The cable to the pump or water pressure sensor is loose, not connected, or defective.

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 gauge on your boiler. If it's too low, re-pressurize your heating system according to your boiler's user manual.

3. 3

   Ensure the mains water supply to the boiler is fully open.

4. 4

   If the pressure appears correct but the fault persists, contact customer service. The water pressure sensor or pump connection may be defective.