thescruff
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Are the pipes connected at the bottom both end or is the flow connected to the top of the rad.
I would give the pipework a good flush out with a hose pipe include the boiler, however you can't flush the rads and these will need to be taken off and flushed individually with a hosepipe outside.
You could check the pump for blockage while it's drained down.
One pipe systems are still installed commercially and works well.
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