System pumps over when hot

[dneale123]

The cold feed pipe gets warm but not hot when the pump over is occurring (although as soon as I notice pumping over I tend to turn the system off). Have just checked and it doesn't seem to get up to the flow water temperature near the bottom of the pipe, so a blockage in the feed pipe could be the problem. I guess it must be worth attacking with a plunger in the F&E tank in the first instance?

joni os: will try that when I can find a suitable bung. Probably later this weekend.

 

[dneale123]

There's a long horizontal 15mm pipe run from the F&E tank so I had a go at this with a straightened coathanger first, then tried applying the plunger to the F&E tank outlet. Ran the system up this morning and no pump-over after 2 hours - so maybe I've shifted just enough to make it work. I also drained off a small amount of water from the system so hopefully whatever was in the feed pipe is now circulating and being dissolved by the sludge remover.

Many thanks to everyone who helped - fingers firmly crossed :smiley2: