radiator p%^&*ng me off

fadetogrey

can anyone on here with plumbing experience help me with a query?we got our house built 5 years ago and the heating is fine except for one radiator in the main bathroom which airlocks after about 2 weeks I bleed all the air out and it works fine again,then after another 2 weeks.............
I was wondering why only this radiator and no other? and where does the air keep coming from? is there anyway to cure it permanently?

gas4you

What type of heating system/boiler do you have?

macman

It's not the rad itself. Once air gets into the system it rises to the highest point-which I'm guessing is your upstairs bathroom rad.

MrVirus

This may be worth a try. If you shut off every other radiator except the troublesome one, it should force all the air out.

Lokolo

You know what, mines exactly the same, and I wondered why it's always just that one. Thanks!

bristoltrain

How is the air getting into the system, I have the same thing but as I live in a town house its the top three radiators, they need bleeding at least once a week and i would guess that at least half of each rad is filled with air before being bleed so where did the water from those rads go

Pincher

Automatic bleed valve?

MrVirus

If they keep filling with air, try holding a lighter to the bleed outlet. If it lights it'll probably be hydrogen which would indicate that the system is rotting. If that is the case, drain it all down and add inhibitor (sentinel x100 for example) and refill the system.

anotherbaldrick

MrVirus wrote: »

If they keep filling with air, try holding a lighter to the bleed outlet. If it lights it'll probably be hydrogen which would indicate that the system is rotting. If that is the case, drain it all down and add inhibitor (sentinel x100 for example) and refill the system.

It would only be hydrogen if water was being lost through a leak somewhere and fresh water water being constantly added as top up from the header tank . Once the system is in use any free air should be driven off (which is what needs venting) and the system contents then do not corrode the radiators unless fresh water is introduced for some reason.

MrVirus

A mispositioned pump could be drawing air down the vent pipe. Without seeing the system it's pretty hard to say. Also, if the pump was 'pumping over' (forcing air up the vent) this would aerate the water.

Turning the pump speed down could cure both of these.