BoilerFaultCodes 164-026 High
Boiler Fault Code 164-026
Also written as 164026 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 164-026 appears across 1 boiler brand and 6 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 a sensor that measures water temperature is providing an incorrect reading or has become disconnected. (As reported on Ideal Mini HE)
Pick your boiler brand for the 164-026 fix
Source
Information for the 164-026 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