central heating sucking air in


Postby mreay » Sun Jan 04, 2009 2:37 pm

We have an old system and the upstairs rads are now cold suggesting a lot of air in the system. When I try to vent the rads they suck air in and then hot water runs into the header tank from the vent pipe of the hot water heating circuit.
The boiler has now started to switch on/off when the heating is put on. OK when just hot water heating is on.

I tried fitting a tap into the rad circuit near the boiler and use gentle mains pressure to push air out of the rads. It just pushed hot water into the header again from the hot water heating circuit.

any ideas,

Very cold Mike
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Postby plumbbob » Sun Jan 04, 2009 11:50 pm

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Postby Steve the gas » Mon Jan 05, 2009 5:37 am

Hi Mike,

I would check out the pump and MV first.
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Postby mreay » Mon Jan 05, 2009 6:14 pm

thanks for the advice, i'll give it a go.

mike
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