How much does it cost to fix boiler error code Q-Error?

Typical repair cost for the boiler Q-Error fault is £100-£200 including labour.

Q-Error High

Boiler Fault Code Q-Error

Also written as QERROR — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Q-Error appears across 1 boiler brand and 6 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's computer does not recognise which specific version of the appliance is installed, preventing it from functioning correctly. (As reported on Navien NCB 28 HE)

Pick your boiler brand for the Q-Error fix

Navien Q-Error 6 models

Source

Information for the Q-Error 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