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I have kept the neon screwdriver, it's just quick and handy. Armed with the multimeter I am reading the following; C/H OFF Orange 0 volts Grey 248 volts Brown 108 volts C/H ON Orange 247 volts Grey 247 volts Brown 116 volts Clearly not as it should be but, what's the fault and most importantly...

I will check with a meter tomorrow. I have looked in the wiring center for loose/stray wires but, all looks to be in order, as far as wiring center's can be

I used a neon screwdriver. I will try a multimeter tomorrow (I have one in my tool box at work

Yes, this is what I'm trying to resolve. It appears the instruction from the programmer is not reaching the valve/motor on this zone. How and why is what is giving me a headache! LOL In terms of H/W and 2nd C/H zone it all works and the zone with the issue works when I open the 2 port manually...

Yes, No demand - no C/H either zone, no H/W, no pump running, nothing and there is power at the brown and grey wire, nothing on orange or blue

No demand = power to brown and grey; demand shows power on brown, grey and orange

The spindle turns freely by hand and when the motor is moved from 'Auto' to 'Manual' the heating zone fires up. By 'regin plug needing to be mirrored' I assume orange to orange (terminal 1) grey to grey (terminal 2) brown to brown (terminal 3) neutral to neutral (neutral terminal) is what you mean?

Looked and checked all looks good, the new motor is wired via a regin 5 pin :)

I don't think I have but, I'm off to the top of the house to DOUBLE check! Thanks

Unvented S Plan System with 2 heating zones Danfoss WB12 wiring centre Danfoss TP9000 programmer with Danfoss TS2 temperature sensor zone 1 C/H and H/W Danfoss 4 wire 2 port valve C/H zone 1 Danfoss 4 wire 2 port valve H/W Range Tribune Cylinder with tank thermostat and immersion heater 3...