That only worked if the cold was from the mains.
Brian

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This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please
Note this Signature is meaningless.!
"newshound" wrote in message
o.uk...
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?

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Adam

Airlock.

No CH when I was a kid, but a routine at home every time a hot water tap
washer had to be changed was to connect a hose between hot and cold water
taps in the bathroom, and turn both on.