How much does it cost to fix Potterton error code Case sensor?

Typical repair cost for the Potterton Case sensor fault is £120-220 including labour.

Case sensor High

Potterton Case sensor Fault Code

Q: What does the Potterton Case sensor fault code mean?

Your boiler has detected a communication failure with a internal safety sensor, causing it to shut down to prevent unsafe operation.

Also written as CASESENSOR — same fault.

The Potterton Case sensor fault code means: your boiler has detected a communication failure with a internal safety sensor, causing it to shut down to prevent unsafe operation.. It appears on 1 Potterton model in our database.

Technical description: Sensor failed open or closed circuit Replace sensor

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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Potterton models that show the Case sensor fault code

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

Envoy 30 Repair: £120-220

Source

Potterton Case sensor 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