T i m wrote:
On Tue, 12 Jul 2016 21:30:01 -0000 (UTC), Tim+
wrote:


or failing pump
probably.

It's yer classic Grunfoss 3 speed and sounds like it running ok (and
again, you have a good flow round the system).

Not unknown for impellers to come adrift of the motor shaft or just get
eroded away through corrosion/cavitation. But if pipes are heating up
quickly downstream after firing up then probably okay.


Okay, I'm out of ideas. ;-)


Tim


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