How much does it cost to fix boiler error code Primary flow switch operated?

Typical repair cost for the boiler Primary flow switch operated fault is £120-220 including labour.

Primary flow switch operated Medium

Boiler Fault Code Primary flow switch operated

Also written as PRIMARYFLOWSWITCHOPERATED — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Primary flow switch operated 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 detects water movement even when it is not supposed to, which often means an internal valve is stuck or a sensor is misreading the flow. (As reported on Alpha CB 240 / 280)

Pick your boiler brand for the Primary flow switch operated fix

Alpha Primary flow switch operated 2 models

Source

Information for the Primary flow switch operated 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