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Thanks for all you help. You guys on here give alot more clear useable information than the plumbers forum im on.  In short all i got there is "stick a relay on it" or "rewire"  I have solved the problem now. It turns out that honeywell and similar 3 port valves have a residual voltage left...

Forgive me as im just the heating engineer so Im a little out of my depth when talking complex electrics. voltage is being measured with my tester which is a Megger Fork Multimeter DCM330 and my electrician has a megger multifunction tester for doing 17th edition and part p tests. From what i...

Phantom voltage? The wiring is completely correct according to 3 port diagrams. We've gone over it 3 times, hes checked each wire for damage, re terminated all connections, taken components (cylinder stat, programmer, roomstat) out of the equation. it always comes back to 89v staying there once...

Hi Sorry to bring up a very old post. Lilman,did you get to the bottom of this because iv got exactly the same problem. 89v once the heating is satisfied through the switch live, is keeping the boiler on. Iv checked the honeywell MI's and they are stating this is whats meant to happen, between...