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I need to drain my central heating down to replace and move a couple of rads. My heating hasn't been serviced for the 7 years I've been in the house although my back boiler is done annually. I am getting a high pitched whining noise ( like a vibration) from the back boiler, when the heating...

I have an old back boiler regulary seviced. After the heating and water has been on fpr a few hours the boiler becomes very noisy. Can best be described as a high frequency whinning or very loud vibration. Any ideas. Heating and Water all appears to work fine apart from this.