How much does it cost to fix boiler error code 39?

Typical repair cost for the boiler 39 fault is £180-450 including labour.

39 High

Boiler Fault Code 39

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 39 appears across 3 boiler brands and 12 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has lost communication with your wall thermostat, meaning it cannot receive the signal to turn on your heating. (As reported on Ideal Maximiser SE)

Pick your boiler brand for the 39 fix

Ferroli 39 3 models Halstead 39 8 models Ideal 39 1 model

Source

Information for the 39 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