What does the Glow-worm F.88 fault code mean?

Your boiler is unable to safely control the flow of gas necessary to ignite the flame, meaning it cannot produce heat or hot water.

How much does it cost to fix Glow-worm error code F.88?

Typical repair cost for the Glow-worm F.88 fault is £200-350 including labour.

Manufacturer manual

Fault: Gas valve assembly

Shared across the Betacom 4 range

This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.

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

Boiler cover options

A cover plan would handle faults like F.88: no call-out fees, no surprise bills.

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Seeing a different code? Every code this model can display, in one place.

Almost always a stuck diverter valve on a combi.

Older boilers: thermocouple, draught or gas supply.

7 signs repair isn't worth it anymore.