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have turned off all the rads except the 2 not working ( 2 ft away from each other) no heat in rads or pipes. suspect i have a blockage in pipes, would a couple of drain downs help ?????

will try this when i get home, rads that are cold are only 1m apart as one in porch and other in downstairs cloak.

hi, had a leak on a rad valve . drained down system partially as only needed to work on upstairs rad and replaced faulty valve. vlaves on rads are not TRV's. filled system and bleed all rads and pump ( gravity system) have balanced the rads but have 2 rads downstairs not getting hot. they...