In an earlier contribution to this discussion,
Bob wrote:

Remind me of the original problem - it seems a long time since I
wrote the above!


Aye, just about a month ago now

A description of the system - including the relative position of
boiler, pump, zone valves, etc. would help. Even better if you can
take some photos and upload them to a website and post a reference
to them.

Here's the description I posted first time, aswell some other bits I
posted:
SNIP

Ah, I remember the one. With a Bermuda and gravity hot water there won't be
any motorised valves - so don't waste time looking for them.

It still sounds as if there is a blockage on the flow side of the CH
circuit. Are the downstairs rads ok? When you flush the pipes out with an
upstairs rad removed by opening each valve in turn (with the pump off, of
course) do you get a good flow from *both* valves?

Are the HW and CH circuits separate, or do they share any pipework? If it's
like the Bermudas which I used to own, the boiler casting will have 4
connection points - 2 on each side. It works best if the HW circuit is
connected to one side and the CH circuit to the other - but you sometimes
find them both connected to the same side, and then splitting into 2
circuits.

Is this a recent problem, or has it *never* worked properly?
--
Cheers,
Set Square
______
Please reply to newsgroup. Reply address is invalid.