What does the Grant Overheat thermostat fault code mean?

Your boiler has automatically turned itself off because it became too hot, acting as a safety precaution to prevent damage.

How much does it cost to fix Grant error code Overheat thermostat?

Typical repair cost for the Grant Overheat thermostat fault is £120-250 including labour.

Safety device that may require resetting if the boiler exceeds temperature limits.

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.