what causes motorised valves and pump to run when boiler and

[angelf]

what causes motorised valves and pump to run when boiler and programmer are off?

 

[Joe 2017]

how about frost stat, valve sticking, wiring fault, pump overrun - the list is endless

 

[onlyfitidealboilers]

2 port or 3?

 

[angelf]

it is a wiring fault...oh and its a 2 port hw valve does that help?

 

[twgas]

Do you mean it's wired wrongly or that there is an electrical fault.

 

[angelf]

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

 

[twgas]

So have you replaced a MoMo valve with a spring return?

 

[Matt 87]

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

 

[angelf]

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

 

[Matt 87]

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!

 

[twgas]

Are you actually a trained professional or more of an odd job man?

 

[angelf]

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.

 

[sparkiedave]

oops!