How much does it cost to fix boiler error code Water temperature too cool?

Typical repair cost for the boiler Water temperature too cool fault is £150-350 including labour.

Water temperature too cool High

Boiler Fault Code Water temperature too cool

Also written as WATERTEMPERATURETOOCOOL — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

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

Most common meaning Your boiler is struggling to reach the temperature you have set because it is not receiving enough gas or is failing to detect the water flow correctly. (As reported on Worcester Bosch 24si II)

Pick your boiler brand for the Water temperature too cool fix

Worcester Bosch Water temperature too cool 1 model

Source

Information for the Water temperature too cool 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