How much does it cost to fix boiler error code 81-01?

Typical repair cost for the boiler 81-01 fault is £100-180 including labour.

81-01 High

Boiler Fault Code 81-01

Also written as 8101 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 81-01 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 detected an issue with the sensor that measures the temperature of the water leaving the unit, which usually results in the system shutting down for safety. (As reported on Daikin D2CND)

Pick your boiler brand for the 81-01 fix

Daikin 81-01 1 model

Source

Information for the 81-01 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