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

Typical repair cost for the boiler TEC fault is £90-140 including labour.

TEC Low

Boiler Fault Code TEC

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code TEC 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 has reached its internal timer for a routine service and is simply reminding you that it is time for a professional maintenance check. (As reported on Navien NCB CE)

Pick your boiler brand for the TEC fix

Navien TEC 6 models

Source

Information for the TEC 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