Some Tepid Radiators

8 Jan 2007
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United Kingdom
Some of my radiators are only tepid. Flow side of radiators is Hot and return is Cold.
Water Heating working fine.
Near Boiler CH system has a T-Junction in Pipework - All radiators on one side of the T seem fine.

On the other side of T first radiator seems to heat fine. but subequent radiators are not. The Flow side of these radiators seems hot - but return cold. Even if I turn the first (the good) radiator on this side off the subsequent radiators do not seem to get beyond tepid.

Any thoughts
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sorry mate but I, for one, would need to see it to make my mind up

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