2 way motorised valve problem

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mazdaq

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We have three 2-way valves in our system - one each for hot water, upstairs heating and downstairs heating.

Noticed that the downstairs heating not working and narrowed it down to the valve. I've bought a new motor from screwfix, which has made no difference. I've then changed the entire housing of the valve as I thought the gear mechanism may be shot but that has made no difference. If I remove the housing and move the valve spindle manually, it turns fine.

I'm now at a loss as to what is actually wrong with it. Any advice please?
 
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Check the room thermostat that controls that valve , a very easy test if you say which model it is , we will tell you how, only a screwdriver needed
 
The feed going to the valve from the boiler is boiling hot, but after the valve, it's cold. Suggesting that the valve hasn't opened? But I don't understand why as I can see gear mechanism moving to open the valve and I've manually moved the valve spindle with my hand and it seems fine.
 
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when you move the valve spindle by hand does the water then flow through the valve
 
Have you checked there is power to the valve when the heating is being called for? If the motor isn't being driven open, it wont activate the microswitch to feed the boiler and pump.
 
Have you wired it correctly, as in same wires in same place?
 
ianmcd said:
when you move the valve spindle by hand does the water then flow through the valve
Click to expand...

Yes. I can feel hot water flowing through the pipe after the valve. But that hot water isn't reaching the first radiator. Thoroughly confused now!
 
Hugh Jaleak said:
Have you checked there is power to the valve when the heating is being called for? If the motor isn't being driven open, it wont activate the microswitch to feed the boiler and pump.
Click to expand...

Not sure. How do I check this?
 
If you are opening the valve manually and you have other zones open at the same , and the radiators are not heating then you have some kind of obstruction, is this the part where you tell us you had the downstairs rads off to decorate or something
 
Ha! Upstairs heating is on fine, hot water fine. Are you suggesting a frozen pipe? I noticed a problem with it yesterday evening but it wasn't freezing outside by that point. Ice on the car this morning though. But I haven't had the rads off for decorating!
 
mazdaq said:
Are you suggesting a frozen pipe?
Click to expand...
Nope would never be a frozen pipe, try switching off the upstairs heating and the HW circuit and only leave the downstairs circuit on, what happens then ?
 
The pump seems to be working fine. As I say, upstairs rads heating up. Just noticed that now I have turned upstairs heating on, the pipe out of the valve to the downstairs rads has now cooled down but valve is still manually open. Which I don't understand as surely if its pumping to upstairs then it should be pumping downstairs too?
 
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