BoilerFaultCodes 438 Medium
Boiler Fault Code 438
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 438 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 has lost the connection to the sensor that monitors your incoming cold water, meaning it cannot properly regulate the temperature of your hot water supply. (As reported on Vokera Eclipse)
Pick your boiler brand for the 438 fix
Source
Information for the 438 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 7 July 2026