Rads getting hot when they shouldn't

[Woolmer]

Hi,

Hopefully someone out there can help, basically now the summers here !! I have switched the programmer (LANDIS & GYR RWB200) to HW only in the morning and late evening. The room stat (Brtish Gas RS1) is turned down to minimum (10). However the rads are heating up.

I have read a couple of posts and suspect there is a problem with the Sunvic SD2701 motorised valve.

Please help ta

 

[gas4you]

I think you already know your answer

 

[seco services]

when only hw on check the pipe from mot valve to the rads is it hot ?

 

[Woolmer]

sorry just had my dinner, seco services which pipe would that be top, side or bottom?

 

[seco services]

one will come from the pump to mot valve.
other from valve to cylinder.
other from valve to rads.

feel the rad one as far along the pipe as you can.

 

[Woolmer]

one will come from the pump to mot valve.
other from valve to cylinder.
other from valve to rads.

feel the rad one as far along the pipe as you can.

will do

 

[Woolmer]

just done that all three pipes are getting hot - and the motorised valve is making a clicking noise (heard a wiring noise at first) I guess the valve is shot?

 

[seco services]

sounds like the motor is trying to open the valve etc.
but it shouldn't be getting power from the wall stat if its off at programmer and wall stat turned down.


can you remove the lid and check it.

 

[Woolmer]

sounds like the motor is trying to open the valve etc.
can you remove the lid and check it.

Can I do that without turning the elec off - they are all watching Eastenders or Corination Street

 

[seco services]

yes just don't stick ya fingers in their.
you should be able to isolate the system from a fused spur etc without isolating the whole house.
you want it live see whats going on.
if ya gonna poke use an elecy screwdriver etc.

 

[Woolmer]

yes just don't stick ya fingers in their.
you should be able to isolate the system from a fused spur etc without isolating the whole house.
you want it live see whats going on.
if ya gonna poke use an elecy screwdriver etc.

your a star - gonna give a go tomorrow (once I've got electrical screwdriver!!)

I'll let you know how I get on - what would I be looking for?

Cheers

 

[seco services]

see whats going on, sounds stuck or something.

the motor should only work if the ch is on at programmer and wall stat is calling for heat the motor winds across the valve.

handy if you have a multi meter to.

 

[Woolmer]

Hi, I have had another look at the valve - I have taken it off the pipe to have a look at the back I can see that there is a D shaped spigot ? that moves the valve on the pipework any way when I move the timer to HW only the motor moves the spigot through 90 degrees which I presume gives hot water and no heating, however it then moves back by 45 degrees and starts clicking.

When I manualy move the valve on the pipework the hot water is okay and the rads stay cold.

I am assuming that the motorised valve is knackered? can I take it apart and have a look

I hope that all makes sense![/img]

 

[kevplumb]

change the head its donald ducked

btw i'm only a plastic yank

 

[seco services]

yes take the lid off and have a look.

when you put the hw on the valve will fall to hw only by a spring not the motor.
hw only is its relaxed position where it would say if you removed all power from the valve.

the motor will only come in to play if you want hw/heating or heating only.