What does the Johnson Starley FAILURE TO LIGHT fault code mean?

Your boiler is not firing up because it isn't receiving the correct signal from your thermostat or internal controllers to start the heating process.

How much does it cost to fix Johnson Starley error code FAILURE TO LIGHT?

Typical repair cost for the Johnson Starley FAILURE TO LIGHT fault is £120-350 including labour.

Check that your room thermostat is turned up higher than the current room temperature.

External controls, port valves, or programmer issues. Includes checks for 230V on display SL and potential display or PCB replacement.

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

Work through these before the call-out.

Safety-critical — turn off, read this.

7 signs repair isn't worth it anymore.