On 07/10/2019 18:46, Andrew wrote:
On 07/10/2019 18:43, ARW wrote:
On 06/10/2019 15:44, Andy Bennet wrote:
On 06/10/2019 13:00, ARW wrote:
The water to the header tank was turned off and the system drained
down.

Swapped the mid position vale and it will now not fill back up.

The odd thing is the header tank did not drain off - it was still
full when I went to turn the water on.


Suggestions?

--

Adam

Congealed sludge in the downfeed from the header? I had that a few
years ago on a bend situated behind the hot water tank. Happy days.

Correct and a 15mm gate valve that I did not know (shelves full of
towels etc) between the header tank to the CH pipework (joining into
the CH pipework just below the air separator) that I did know about.

It looks like the valve was not fully open (and has probably been like
that for 20 years) allowing crud and to fill the 15mm feeder pipe.

New gate valve and a bucket of water through the header tank and all
is well.

Thank you to you and everyone else that has helped.


Don't forget the inhibitor :-)


I certainly did not. I have **** loads of the stuff as some new-builds I
was working on had electric only heating. The bathroom and en suite had
water filled towel rads with electric elements and they sent a full
bottle of inhibitor with every house. One bottle did all 20 houses and I
kept the rest:-)

--
Adam