High
Return sensor on Potterton Envoy 30

Your boiler has lost its ability to measure the temperature of the water returning to it, so it has shut down to prevent potential damage.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description

Sensor failed open or closed circuit Replace sensor

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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