In an earlier contribution to this discussion,
John wrote:

One of my radiators has gone very sluggish. It is the small size
microbore with twin entry valves. Worcester Heatslave Highflow Combi.

I think I should try a flushing / cleaner. Any suggestions for a good
but cheap solution / method.

I am currently running with all rads off except the sluggish one and
it isn't making much difference.

The cheapest *and* most effective solution would be to remove the radiator,
take it outside, and give it a good wash out with a hose pipe. That is, if
the problem *is* sludge.

Are you sure the pump is ok? Do the other radiators work ok when you turn
them on? Does the dodgy radiator have a TRV? Are you sure that it's opening?
Is the lockshield valve fully open?
--
Cheers,
Set Square
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