How much does it cost to fix boiler error code 0.90?

Typical repair cost for the boiler 0.90 fault is £150-250 including labour.

0.90 High

Boiler Fault Code 0.90

Also written as 090 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 0.90 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 heating system has detected an issue with the heat output sensor or internal temperature readings, causing the unit to stop heating your home as a precaution. (As reported on Johnson Starley Aquair S 10)

Pick your boiler brand for the 0.90 fix

Johnson Starley 0.90 1 model

Source

Information for the 0.90 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