What does the Glow-worm F.75 fault code mean?

Your boiler is struggling to detect a rise in pressure when the pump starts, which means it cannot safely confirm that water is circulating properly.

How much does it cost to fix Glow-worm error code F.75?

Typical repair cost for the Glow-worm F.75 fault is £140-£250 including labour.

Check the pressure gauge on the front of the boiler or under the sink.

Pressure sensor fault

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Six most common causes of dropping pressure.

Each noise points to a different fault.

Safety-critical — turn off, read this.