central heating not working after new radiators fitted


Postby pinkllama » Thu Jan 07, 2010 3:03 am

hi all,

i have just replaced 2 radiators with larger ones in my flat as it took hours to heat the flat up.

it's an open system, ie there is a header tank in the loft.

i refilled the system and bled all the radiators.

the problem now is that the boiler fires up for a few minutes and then switches off - not heating any of the radiators.

prior to fitting the new radiators, it worked fine.

i understand that the boiler is switching itself off as a safety measure as it is too hot.

i think that there could be an air lock in the boiler that is preventing it from working/ pumping the water around the radiators.

its currently -5c outside and i desperately need some help!!

one thing that could be a clue as to why it's not working is, when i refilled the system the header tank let loads of water in for a few seconds then it just trickled in for the next hour or so before all the radiators were full of water.


any advice?

thanks
pinkllama
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Postby plumberman666 » Thu Jan 07, 2010 10:50 pm

The boiler is airlocked and its a pain to shift,you need to try and vent it by slightly opening a compression fitting on top of the boiler,there should be one. You can remove the thermostat sensor and kettle the boiler but this is a bit dodgy. It seems that your system has some sludge in it. You can remove this by adding some remover and circulating it for a couple of days with the heating on,then removing it and adding some protector.
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Postby rosebery » Thu Jan 07, 2010 11:45 pm

You've also got a blockage in your microbore pipework so clearing the airlock now is prolly a waste of time. You really do need to get someone in.

Cheers
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Postby pinkllama » Fri Jan 08, 2010 4:56 am

[quote="plumberman666"]The boiler is airlocked and its a pain to shift,you need to try and vent it by slightly opening a compression fitting on top of the boiler,there should be one. You can remove the thermostat sensor and kettle the boiler but this is a bit dodgy. It seems that your system has some sludge in it. You can remove this by adding some remover and circulating it for a couple of days with the heating on,then removing it and adding some protector.[/quote]

thanks for the advice.

got a plumber round as i think i was starting to do more harm than good.
pinkllama
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