Johnson Starley FLUE TEMPERATURE SENOR LOCKOUT Fault Code: What It Means & How to Fix It

Your boiler has shut itself down as a safety precaution because it detected that the exhaust gases are becoming too hot.

Typical repair cost for the Johnson Starley FLUE TEMPERATURE SENOR LOCKOUT fault is £120-250 including labour.

Technical description

Flue temperature sensor lockout

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.

Sludge build-up — needs flushing, not bleeding.

Safety-critical — turn off, read this.