How much does it cost to fix boiler error code 3 1.?

Typical repair cost for the boiler 3 1. fault is £90-160 including labour.

3 1. High

Boiler Fault Code 3 1.

Also written as 31 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 3 1. appears across 2 boiler brands 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 has stopped working because it has detected a fault with the internal sensor that monitors the temperature of the water leaving the unit. (As reported on Remeha Quinta Ace 25)

Pick your boiler brand for the 3 1. fix

Remeha 3 1. 3 models Worcester Bosch 3 1. 1 model

Source

Information for the 3 1. 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