What does the Glow-worm F.28 fault code mean?

Your boiler has tried to light itself three times but failed to stay on, meaning you currently have no heating or hot water.

How much does it cost to fix Glow-worm error code F.28?

Typical repair cost for the Glow-worm F.28 fault is £100-350 including labour.

Check if your gas meter has credit (if on a prepayment meter)

Ignition unsuccessful when starting up

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

Almost always a stuck diverter valve on combis.

Lockout fault with a reset-needed pattern.

Older boilers — thermocouple, draught, gas supply.