What does the Potterton neon flashing (Section J) fault code mean?

Your boiler has detected that it is running too hot and has automatically shut itself down to prevent damage.

How much does it cost to fix Potterton error code neon flashing (Section J)?

Typical repair cost for the Potterton neon flashing (Section J) fault is £120-250 including labour.

Overheat thermostat operated or faulty - Allow to cool. Continuity across thermostat terminals should be less than 1.5 ohm.

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

Almost always a stuck diverter valve on combis.

Each noise points to a different fault.

Work through these before the call-out.