High
A1 281 on Worcester Bosch Danesmoor

Your boiler is unable to move water around the system, usually because the pump is jammed or there is too much air trapped inside it.

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

Pump stuck or running with air in the system

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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