It filled up hot water from the return pipe, half the radiatior - but pipe still cold and doesn't appear to be anything coming through the thermostat valve???

Only way you can test it, is to remove the rad and run water through the valve, preferably using a hose pipe as per my earlier post.

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Hi Scruff. I have tried the above and still can't get any wather through. Should I try replacing the valve??

If you have the valve disconnected from the rad and no water, then a new valve would be the order.

Have you tried lifting the pin 2-3mm with grips, and do remember if it pots up water will shoot out, so you should have a hose connected.

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I have tried lifting the pin and still nothing. As long as the heating is switched off and the radiator empty, can I replace the valve without water gushing out the infeed pipe??

Best to drain down or at least take the pressure down to zero, and snatch change it.

After the carpets are secured.

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Drain down the whole system??

To be safe yes.

A pro would take the pressure off the system and snatch it as said, but you could get wet if it goes belly up.

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I'm going to ask a silly question now, if I try and change without draining, I'm likely to get flooded???!! Think I know the answer, but need to ask. Its a conventional gravity fed boiler with tank in the loft. And do you think I'm better getting a pro to do it?

Shucks it's a simple as ABC job.

As I said just remember to protect everything, and take your time.

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Thanks - I'll give it a go

Better say if you do snatch it, remember to turn the decorators cap down so you can't blow through the valve.

Have the new valve ready, Hold the valve tight in one hand and undo the nut holding it on the pipe, all you do then is swap them over as quick as you like.

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the decorators cap?

When you get the valve it will have a cap so you can manually turn the valve off.

Go for the same valve as existing.

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ok, thanks