what causes motorised valves and pump to run when boiler and

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what causes motorised valves and pump to run when boiler and programmer are off?
 
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how about frost stat, valve sticking, wiring fault, pump overrun - the list is endless
 
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it is a wiring fault...oh and its a 2 port hw valve does that help?
 
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Do you mean it's wired wrongly or that there is an electrical fault.
 
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I took out a sunvic m.v (crap) and replaced it with a honeywell m.v. The only difference was that the honeywell valve had an earth. I carefully unpicked each wire from sunvic m.v & replaced it with wires from honeywell. Simple not!!! I'm getting heating & hot water on permanently. It doesnt help that the boiler/programmer are on ground floor, room stat on first floor and cylinder stat m. valves & pump on 2nd floor along with 2 spaggetti junction boxes. Aghhh
 
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So have you replaced a MoMo valve with a spring return?
 
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wanna get yourself a Honeywell wiring guide which has all the motorised valves and what each colour corresponds to, will look in the morning if I remember
 
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Have done all this but some wires are double coloured ie brown sleeved with a blue plastic cable cover, some wires are taped up (mainly the brown ones!) and some are just simply cut out ie the blue ones. So UNLESS i SPEND ALL DAY UNPICKING THIS "TIN OF WORMS" I dont think I can see an S plan there at all. Will call a decent electrican to sort it out.
cheers
 
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Don't call an electrician, they usually don't have a clue about wiring central heating systems and make an absolute mess of it, especially annoying for fault finding!

Call a decent heating engineer, get them to put in an LWC1 wiring centre and job done!
 
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Are you actually a trained professional or more of an odd job man?
 
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am gsr but very warey of electrics that do not follow the s/y etc plans that i am used to. I also dont want to bugger up the customers system.
 
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