What does the Johnson Starley 12 fault code mean?

Your boiler has entered a general safety shutdown and needs to be manually restarted to check if the error is temporary.

How much does it cost to fix Johnson Starley error code 12?

Typical repair cost for the Johnson Starley 12 fault is £100-250 including labour.

Locate the reset button on the boiler control panel

Default 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.

Lockout fault with a reset-needed pattern.

Older boilers — thermocouple, draught, gas supply.

7 signs repair isn't worth it anymore.