Hi all,

I have a CPC Azurro paradigma collector that's refusing to pass water. Earlier in the summer it was sluggish so I drained the system, added cleaner, flushed and refilled, but just with water, as the risk of freezing was nil, with the intention of testing for a while then replacing with glycol mix.

Fast forward and we have to urgently replace the hot water cylinder, so the solar gets drained and disconnected, but there's no time to reconnect before we go away for 3 weeks. 

Meanwhile, baking hot weather. Now I come to flush again and test before reconnecting to the cylinder, unfortunately with mains pressure one side I get a clean, but very slow trickle the other side.

Reading an earlier post I see that the glycol mix can boil and clog the tubes.

Is this the likely problem here? And is the only remedy to replace the collector?

Thanks in advance.