How much does it cost to fix Potterton error code Flow Switch?

Typical repair cost for the Potterton Flow Switch fault is £150-250 including labour.

Flow Switch High

Potterton Flow Switch Fault Code

Q: What does the Potterton Flow Switch fault code mean?

Your boiler has detected that there is not enough water flowing through it, so it has safely shut itself down to prevent damage to its internal components.

Also written as FLOWSWITCH — same fault.

The Potterton Flow Switch fault code means: your boiler has detected that there is not enough water flowing through it, so it has safely shut itself down to prevent damage to its internal components.. It appears on 1 Potterton model in our database.

Technical description: Dry fire protection (No specific E-code in text)

Typical repair cost £150-250 (including labour)

Engineer required

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

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Potterton models that show the Flow Switch fault code

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

Promax FSB 30HE Repair: £150-250

Source

Potterton Flow Switch fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.

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