How much does it cost to fix boiler error code 48?

Typical repair cost for the boiler 48 fault is £150-250 including labour.

48 Medium

Boiler Fault Code 48

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 48 appears across 5 boiler brands and 11 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is having trouble controlling the temperature for one of your heating zones, likely due to a faulty sensor reading. (As reported on Viessmann Vitodens 222-F)

Pick your boiler brand for the 48 fix

Alpha 48 1 model Gledhill 48 1 model Ideal 48 1 model Viessmann 48 7 models Vokera 48 1 model

Source

Information for the 48 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