On 27 Jul 2003 06:12:51 -0700, Steve Wilson wrote:
How much gung/sludge is in the bottom of the expansion tank? Draining
might have drawn some into the system causing a blockage.
Though I suspect it' more likely to be a problem with valves not being
open to let the air out and the water in. See if excercising the
system to see if you can get things shifting. Most motorised valves
have a manual device for opening them. Use it and open all valves, 3
port ones set to their mid position so all the ports are connected top
each other. Also switch the boiler off on it's own switch or
thermostat to stop it firing on a possibly dry boiler.
Dave. pam is missing e-mail
You are a lifesaver ! If you live anywhere near Milton Keynes, I'll buy
you a beer, or several !
I drained the system down again and, lo and behold, the header tank wasn't
draining, so I disconnected the outlet pipe and jubilee'd a hosepipe to it
as per your instructions. Turning on the hose led to a sudden bout of
gurgling, then water started spurting out of the open valve of a downstairs
radiator (which I took to be a good sign!).
The system refilled perfectly, better in fact than it has ever done in the 4
years that I have been living here (and I've been through the
draining/refilling routine more times than I care to remember). The smart
new rad. works well and we won't have to have cold showers tomorrow morning
So did you use the mains just to unblock, or have you filled the whole
system via the hose pipe? (just thinking it wouldnt have any corrosion
inhibitor or anything in if you did that?)
By far and away the most likely cause is an airlock. To cure this, you
could try draining down again and re-filling, but this probably won't
work. The easiest way is to drain down, then fill via the drain point
using mains pressure water. You'll need someone watching the header tank
and as soon as water starts rising in this, stop.
*I feel like I'm diagonally parked in a parallel universe.
Dave Plowman email@example.com London SW 12
If the cylinder, pipework, radiators and boilers are all man enough to take
it, then convert the gravity fed system to a sealed pressurised one. Then
you just don't get these problems. The kit of parts to do so is very cheap
and you could probably fit it in the time it takes to sort out your airlock!
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