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

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

Primary flow switch operated Medium

Alpha Primary flow switch operated Fault Code

Q: What does the Alpha Primary flow switch operated fault code mean?

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.

Also written as PRIMARYFLOWSWITCHOPERATED — same fault.

The Alpha Primary flow switch operated fault code means: 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.. It appears on 2 Alpha models in our database.

Technical description: Follow section 'C' fault finding

Typical repair cost £120-220 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Alpha models that show the Primary flow switch operated fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Alpha Primary flow switch operated fault code information on this page is sourced and cross-checked against the official Alpha service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026