What does the Glow-worm All Boilers fault code mean?

Your boiler has failed to ignite and cannot produce heat or hot water, usually because the gas supply is blocked or the ignition spark is failing.

How much does it cost to fix Glow-worm error code All Boilers?

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

Check if your gas meter has credit and the isolation valve is open

F28 / F1 / F4

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.