How much does it cost to fix boiler error code Pulse Red (1 flash)?

Typical repair cost for the boiler Pulse Red (1 flash) fault is £120-200 including labour.

Pulse Red (1 flash) High

Boiler Fault Code Pulse Red (1 flash)

Also written as PULSERED1FLASH — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Pulse Red (1 flash) appears across 1 boiler brand and 2 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 can no longer accurately read the temperature of the water inside it. (As reported on Potterton Envoy)

Pick your boiler brand for the Pulse Red (1 flash) fix

Potterton Pulse Red (1 flash) 2 models

Source

Information for the Pulse Red (1 flash) 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