How much does it cost to fix boiler error code 3 - OVERHEATING?

Typical repair cost for the boiler 3 - OVERHEATING fault is £150-300 including labour.

3 - OVERHEATING Emergency

Boiler Fault Code 3 - OVERHEATING

Also written as 3OVERHEATING — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 3 - OVERHEATING appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has automatically turned itself off because the water inside it has become dangerously hot. (As reported on Ariston Genus Premium)

Pick your boiler brand for the 3 - OVERHEATING fix

Ariston 3 - OVERHEATING 3 models

Source

Information for the 3 - OVERHEATING fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026