Looks like I need to do sort an air lock in the central heating system. System was drained down twice when we had bathrooms done up. Now looks like the plumber didn't bother his @rse to actually check all was ok. Got two cold radiators at the other end of the house upstairs. Did bleed a fair amount of air out of the others and had to top up the system. Oh well that`s what I`ll be doing this afternoon.
Cold radiators
- Thread starter MrGrumpy
- Start date
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figbat
Slippery scientist
- Location
- South Oxfordshire, UK
After a drain-down and refill you often have to go chasing air out of the system as the incoming fresh mains water will have dissolved air in it, which is released over time. With ours it always trips the boiler off for a day or two after a fresh fill but once the air is bled off it never comes back (until the next refill).
I like Skol
A Minging Manc...
- Location
- Sunny Ashton-under-Lyne
30 minute job. Takes that to do my 3 storey, 4 bed semi. It is always the same 2 or 3 radiators that catch the air but I always check them all just to be sure.
If you tell the misses it will take all afternoon you can sneak in a couple of hours talking bollix on the forum....
GlamorganGuy
Well-Known Member
My boiler is working OK but only a couple of radiators in my house are actually heating up. Have bled them all and there seems to be no air at all in the system. Tried turning the working ones off in an attempt to encourage water to flow into the cold ones but it doesn't work. Anyone have any suggestions?
I like Skol
A Minging Manc...
- Location
- Sunny Ashton-under-Lyne
Pump gone? Could just be convection heating a few radiators on the path of least resistance. What type of boiler have you got?
GlamorganGuy
Well-Known Member
Hmm sounds like that could be it. It's a Vaillant Thermo Compact, around 15 years old. Have had a new pump in the past few years but of course that's no guarantee that it hasn't gone kaput again.
Might need balancing if no air. You need to shut down all radiator valves plus lock shields . Then open up slightly one by one with heating on till you get the cold rads warm.
Electric_Andy
Heavy Metal Fan
- Location
- Plymouth
Also worth remembering that you might have to add some more anti-corrosion additive if you've drained a lot out
Do those rads that are not working have thermostat valves on?
GlamorganGuy
Well-Known Member
Yes all the radiators have working valves (except one that's stuck in the "on" position... and it's the only one that's working)
Top off and pull the pin up, they often get stuck down during the summer, long nose pliers will do it.
I like Skol
A Minging Manc...
- Location
- Sunny Ashton-under-Lyne
All of them at once? Would be a hell of a coincidence.
Only 2 not working as I read.
That would be me but my trvs are working
, I just have no hot water even to the pipes !I have my plan for this afternoon.
fossyant
Ride It Like You Stole It!
- Location
- South Manchester
I've found shutting off all the other rads to force the air out of the problem rad works, then open up on by one after a system drain down.
We're lucky, in that air only ever collects in one radiator in the house, and I just bleed it once every 6 months.
We're lucky, in that air only ever collects in one radiator in the house, and I just bleed it once every 6 months.
