High
Burner pulsates on Grant Vortex Blue

Your boiler is struggling to breathe properly, causing it to make a rhythmic thumping or vibrating sound as it burns fuel.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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

Insufficient combustion air supply to burner

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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