Medium
29 on Chaffoteaux Calydra 24 Green

Your boiler is currently stuck in central heating mode, which means you might not get hot water at your taps when you need it.

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

Three way valve blocked in CH mode

Engineer required

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

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