How much does it cost to fix boiler error code Erroneous APS signal?

Typical repair cost for the boiler Erroneous APS signal fault is £150-300 including labour.

Erroneous APS signal High

Boiler Fault Code Erroneous APS signal

Also written as ERRONEOUSAPSSIGNAL — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Erroneous APS signal appears across 1 boiler brand and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has stopped working because it cannot confirm that waste gases are being safely pushed out through the flue, which is a necessary safety step before it can fire up. (As reported on Halstead Finest Gold)

Pick your boiler brand for the Erroneous APS signal fix

Halstead Erroneous APS signal 4 models

Source

Information for the Erroneous APS signal 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