How much does it cost to fix boiler error code 173?

Typical repair cost for the boiler 173 fault is £90-250 including labour.

173 High

Boiler Fault Code 173

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 173 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 that an external safety device or specialized accessory connected to it has been triggered, causing the system to shut down. (As reported on ECA FELiS FL 50 HM)

Pick your boiler brand for the 173 fix

ECA 173 1 model

Source

Information for the 173 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