How much does it cost to fix boiler error code Pulse Red (3 flashes)?

Typical repair cost for the boiler Pulse Red (3 flashes) fault is £150-300 including labour.

Pulse Red (3 flashes) Emergency

Boiler Fault Code Pulse Red (3 flashes)

Also written as PULSERED3FLASHES — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Pulse Red (3 flashes) 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 detected that it is dangerously overheating and has automatically shut down to prevent damage or a safety hazard. (As reported on Potterton Envoy Plus)

Pick your boiler brand for the Pulse Red (3 flashes) fix

Potterton Pulse Red (3 flashes) 2 models

Source

Information for the Pulse Red (3 flashes) 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