How much does it cost to fix boiler error code J6-01?

Typical repair cost for the boiler J6-01 fault is £100-£250 including labour.

J6-01 High

Boiler Fault Code J6-01

Also written as J601 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code J6-01 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 is getting too hot too quickly because water isn't flowing through the system properly or the pressure has dropped too low. (As reported on Daikin D2CND)

Pick your boiler brand for the J6-01 fix

Daikin J6-01 1 model

Source

Information for the J6-01 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