Bit of a odd problem basically I have central heating. The radiator in the
bathroom on heats up half way and the rest of it is stone cold. Both valves
are on open and all the other heaters in the house work.
Any ideas what might be up with it ?
The radiator is in the bottom of the house (downstairs) bathroom. Is this
valve the hex nut type looking thingy :) on the right hand side. There is
something that looks like that can I safely open this without water shooting
Does the heating need to bt on or off to push the air out ?
Right so have just done 10 mins of googling, and it seems I need a bleeding
key :) (I think I have one somewhere ... always wondered what is was for
So please correct me if I am wrong:
1- turn off heating
2 - open both valves at bottom of radiator
3 - open bleed screw half a turn till you hear hissing and then water
dribbling out, then tighten up
4 - Do the rest of the heaters in the house ? (not sure if I need to do all
the others as they all work) but the guide said to?
5 - I may need to repressurize the system ... This bit I'm not sure about
... How wold I do that ? ( I have a combi type boiler)
6 - Thank god I didn't blow the damn thing up
7 - receive praise from wife for not being completely useless at home
maintenance ? wishful thinking... I think so
8 - crack beer open and pat my self on the back if I haven't scolded my hand
Indeed, and if you break H2O down into its component parts by
electrolysis (i.e. galvanic corrosion between dissimilar metals using
the water as an electrolyte), you get...?
One test is to attempt to light the gas that you bleed. If it burns then
you know you have a hydrogen mix that indicates lack of corrosion
As others have said, if corrosion occurs due to a lack of corrosion
inhibitor, hydrogen is produced from the chemical reaction, and tends to
collect in the top of a radiator. But, for the time being, just bleed it out
and then, if necessary, re-pressurise the system using the filling loop.
That might fix it, but if the air/hydrogen keeps coming back, you need to
Have you worked out how to bleed it now? The bit you need to loosen is the
bleed screw, which has a square head about 5mm across. If that's contained
in a larger hex fitting, *don't* undo the whole thing - you'll have a flood!
Do you know whether there *is* any inhibitor in your system?
Appreciate the post.
Yip all done, very easy. Did all the radiator. The radiator in question is
now working correctly. If the problem persists I'll get a professional to
investigate it further.
There is no inhibitor on my system which I guess is my next port of call.
Thanks for all the help and info guys girls and everything inbetween that
Slightly puzzled by your phrase "there is no inhibitor *on* my system".
Inhibitor isn't a device attached to the system - it's a liquid mixed with
the water circulating in your system to prevent corrosion from occurring. Do
you *know* that none was put in when the system was commissioned?
A number of ways...
There is a fair amount dissolved in the water you fill it with in the
first place - it takes a few days for that to all come out of suspension
usually after the system is filled.
Corrosion can manufacture gas as previously mentioned, and surprisingly
small leaks in the system can allow air in.
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