How much does it cost to fix boiler error code P33?

Typical repair cost for the boiler P33 fault is £120-250 including labour.

P33 Medium

Boiler Fault Code P33

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code P33 appears across 1 boiler brand and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is failing to switch off when the house reaches the target temperature, meaning your radiators will stay on until you manually turn the boiler down. (As reported on Alpha Intec 28GS)

Pick your boiler brand for the P33 fix

Alpha P33 4 models

Source

Information for the P33 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