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I have just had a new boiler fitted a potterton 50He I have also had all new radiators fitted.I have had the system flushed and all new trv v/v fitted to the radiators. However I have two radiators up stairs that refuse to get hot. All the down stairs rads are ok and the towel rad in the...

I have just had a new boiler fitted and also new rads which i fitted my self(rads only) the boiler is functioning great but two of the four rads up stairs will not get hot. they have at one point got warm but fail to get to full temp, Can some one give me some advise as to what the problem may...