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OK. All TRV's turned off on upstairs rads and no heating downstairs. Inlet pipes up to rad are warm / hot but nothing going into the rad. Boiler kicks in to heat water but after about 30secs to 1 min shutsdown. No warning lights on the boiler at all. One of the rads was removed yesterday and...

SFK, If I adjust the TRV doesn't that affect the point at which the TRV kicks in when if set to a lower number will close the valve at a much lower room ambient temperature? I understand that the idea of balancing is to ensure that the flow to the radiator is sufficient to get it to temperature...

Before I do this why via the TRV's? wouldn't shutting off via the lockshields be the right way to do this as that shuts the flow of water off to the rad completely without having the TRV open if the temp drops?

Hi All, I've re-attached two radiators back to the system after some decorating and I now have the problem where I get heating upstairs but very little heating downstairs to none on some. Followed various tips such as balancing (all rads (4 in total) upstairs are only set to 1/4 turn open on...