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

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

SEr Low

Boiler Fault Code SEr

Also written as SER — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code SEr 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 simply reminding you that it is time for its scheduled annual safety check and service. (As reported on Vaillant ecoTEC exclusive)

Pick your boiler brand for the SEr fix

Vaillant SEr 1 model

Source

Information for the SEr 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