OK - just bled the rads as I swore I could hear some air bubbling
round and a very mild kettling like sound at the boiler.
The highest rad in the system seemed to have a some (a few
tablespoons worth really) of what I would term "rusty" water come out
(blackish) and then clear, followed by some air, and clear water
Does this mean that there was effectively an airlock in that rad?
The whole system sounds like it's got air in it (gurgling and
whooshing at the 1st rad in the line) but I can't find it (except this
pocket that I've just drained) - but the bit that I drained had taken
3 months to build up - and I had to drain a helluva lot of water to
get the air to appear. The rad was exhibiting no signs of problems
either - no cold spots etc. very odd.
Anyway - I've resigned myself to the fact that once the weather warms
- it's a drain, cleanse, rads off, new locks and therm valves,
possibly new rads for two of them anyway (as I mentioned before) -
boiler service, and if the boiler is in a good shape still after this
winter - a shot of the fernox noise silencer to clean her all down (oh
and some inhibitor) over the period of about a month.
ROll on summer :) I like a challenge.
On Sun, 14 Dec 2003 10:38:03 GMT, Dan delaMare-Lyon
Are you sure you've got inhibitor in that system?
AFAIK a decent amount of inhibitor prevents the water from forming
air, so if the inhibitor isn't up to strength I imagine the system
would be capable of generating air (not sure what variety) in the
It's there but it's weak - following a partial drain for new rads in
an emergency as baby arrived earlier in the year. It's an old sytele
open vented system and thanks to BG maintenance had the pump cranked
up full and was continuously venting onver :(
ANyway - it's a flush and drain in the spring...
On Mon, 15 Dec 2003 10:11:13 GMT, Dan delaMare-Lyon
Might be worth adding some inhibitor to the header tank - then opening
a vent to let some of the water out of the system, thus pulling some
inhibitor in from the header tank to increase the mix of inhibitor in
That wouldn't take very long to do, and might solve the problem until
you have time (and weather conditions!) on your side.
I had a lot of noise and air - the autobleed valve on the boiler had blocked
up. I had a replacement fitted under the service contract - but it would
have been a dead easy job costing less than a fiver.
"Dan delaMare-Lyon" < firstname.lastname@example.org> wrote in message
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