What the manual says
Manufacturer manualFlame signal without flame present – air/gas ratio control valve may need replacing as might the ionisation cable
Shared across the range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.
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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