What does the Grant Lock-out fault code mean?

Your boiler has stopped working because it cannot light the flame required to produce heat or hot water.

How much does it cost to fix Grant error code Lock-out?

Typical repair cost for the Grant Lock-out fault is £150-350 including labour.

Burner fails to light; a built-in safety circuit switches the burner off and the Lock-out reset button on the burner will light.

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.

Each noise points to a different fault.

Lockout fault with a reset-needed pattern.