What does the Grant Lock-out reset button is lit fault code mean?

Your boiler has detected a problem with the combustion process and has safely shut itself down to prevent any hazards.

How much does it cost to fix Grant error code Lock-out reset button is lit?

Typical repair cost for the Grant Lock-out reset button is lit fault is £120-250 including labour.

Check your external fuel supply level (if oil) to ensure the system is not starved of fuel.

If there is a burner malfunction, a built-in safety circuit switches the burner off and the Lock-out reset button 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.

Each noise points to a different fault.

Lockout fault with a reset-needed pattern.

Safety-critical — turn off, read this.