What does the Johnson Starley B18 fault code mean?

Your boiler has shut down because the air in your heating ducts is getting too hot, which can happen if air isn't flowing freely through your home.

How much does it cost to fix Johnson Starley error code B18?

Typical repair cost for the Johnson Starley B18 fault is £120-280 including labour.

Check that all warm air vents and registers in every room are fully open and not blocked by furniture or curtains.

Duct temperature too high

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.

Work through these before the call-out.

7 signs repair isn't worth it anymore.