Medium
LED 3 on Myson System 50

Your boiler is signalling that it is asking the internal air extraction motor to speed up to prepare for ignition.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description

On when there is a demand for the fan at high speed.

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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