How much does it cost to fix boiler error code EE 9955?

Typical repair cost for the boiler EE 9955 fault is £120-200 including labour.

EE 9955 High

Boiler Fault Code EE 9955

Also written as EE9955 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code EE 9955 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 struggling to accurately measure how hot the water is inside the system, so it has safely shut down to prevent overheating. (As reported on Ariston E-Combi One 30)

Pick your boiler brand for the EE 9955 fix

Ariston EE 9955 4 models

Source

Information for the EE 9955 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