What does the Worcester Bosch Primary Overheat fault code mean?

Your boiler has detected that the water inside the unit has become dangerously hot and has shut itself down to prevent damage or fire risk.

How much does it cost to fix Worcester Bosch error code Primary Overheat?

Typical repair cost for the Worcester Bosch Primary Overheat fault is £150-300 including labour.

Boiler fully water pressurised and all air vented; Primary sensor correctly fixed; Pump operation.

This is a emergency 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.

Sludge build-up — needs flushing, not bleeding.