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Both Water and heating valves opening when either system called for

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NikiInCambs

Replaced the head of a Honeywell 2port valve on heating and wired into an old block (S) like for like. However, when either water OR heating called for, both valves open!
Ideas?
 
Brown wire from switched live, blue, neutral, grey wire from permanent live orange wire to terminal 10, the m.valve end switch connects the grey wire to the orange wire.
 

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