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Mend 3 port mid position valve Heating System Port Valve Hot Water

how can i fix my 3 port mid position valve?

i fitted a new 3 port mid position valve ,but when the hot water comes on the heating comes can anyone give me some suggestions

darren hector
July 2008
3 port mid position valveHeating, Home Heating SystemsHeating System 3 Port Valve Hot Water
check your wiring diagram is a y plan

dean
August 2008
wired it wrong

hispec plumbing & heating (essex)
July 2008

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3 Port Valve Problems & Fixes - Heating Help