Strange noise after fitting radiator & draining system

[preecy]

After replacing a radiator at the weekend I now have a strange vibratio

noise somewhere. This noise occurs when the boiler is on:(

Our central heating system seem a little strange to me. We have boiler (gas) in the kitchen which controls the hot water & heating However we also have an emersion heater (electric) in a cupboar upstairs (this is never switched on but I believe the boiler stil pushes the hot water through this as it gets hot when the boilers fire up). In the attic there are two water tanks, a large one and a smal one. I temporarily disabled the smaller one and drained the upstair radiators in order to replace the bathroom radiator. I then re-enable the smaller tank and released the air from the upstairs radiators a they were re-filling.

The noise seems to be coming from either the emersion heater or th boiler. Although they're on different floors there's only 3 or 4 fee between them. I also believe there's a water pump hidden away behin the emersion.

Any suggestions or tip on what to check would be appreciated.

PS - Could there be air trapped in the boiler, pump or emersion

-- preecy

[OldBill]

I think the thing you call an "emersion" is probably a hot water cylinder that just happens to have an immersion heater fitted to it. You've got air in the system. It may get better by itself if the system has an air separator. Try bleeding rads after a couple of days. You did bleed air from the pump too? They have big coin type screw on the end to do this.

[preecy]

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I think the thing you call an "emersion" is probably a hot water cylinder that just happens to have an immersion heater fitted to it. You've got air in the system. It may get better by itself if th system has an air separator. Try bleeding rads after a couple of days. You did bleed air from the pump too? They have big coin type screw on the end to do this.

Err no i didnt bleed the pump... i take it i was suppose to? Will give that a go tonight. Cheers OldBill ;

-- preecy