Bang from gas boiler



A couple of rads in my house were not heating up, tryed bleading them but no air came out so i taught it must be air in the pipework so i turned off all rads except the two giving me the prob, i then turned on boiler and as the boiler was running i then realised balancing valve should also be turned off so i would just be getting circulation through the two rads but as i turned the balancing valve off the boiler let an almighty bang out of it. Can anyone tell me why this happened and should i be worried. thanks
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