My central heating isnt working please help

[seco services]

from that valve is a cable that has 5 wires they should go into a wiring centre.
you need to check to see if the white has got mains power on it.
be careful cause you have to check this will the power on.

 

[CaptainCarling]

If i touch the positive on the white wire, which do i touch the negative to

 

[seco services]

one on the white one on the earth

 

[CaptainCarling]

Im getting 238ish volts to that

 

[seco services]

now check the grey

 

[CaptainCarling]

Yes, 238ish to that as well

 

[seco services]

so that proves the wall stat is calling for heat.
and the cylinder stat is satisfied/or off.

turn the mains power to the heating system off then that will reset the valve it should fall to the W position.

 

[CaptainCarling]

Its gone to the W position.

 

[seco services]

now switch mains back on.
and heating only at programmer wall stat up.

what does it go to ?

 

[CaptainCarling]

Its gone back to M

 

[seco services]

sounds like its knacked.
it should pull right across to the H.
you got all power in the right places.
so i would say the board or somethings gone inside.

you can remove the top plastic cover and see if you can see anything maybe burnt out.

 

[CaptainCarling]

Would you say 99% its knackered then as i might just go get a new one

 

[CaptainCarling]

Thanks a lot for your time and help by the way

 

[seco services]

100% everything proved ok apart from the valve not moving.

you only need an actuator not complete valve.

 

[CaptainCarling]

Ive just phoned for a price and been told £65.23 inc vat does this sound right