No it hasn't always done it. I'll check and see if it's touching anything at the back but pretty sure it hasn't been moved recently. Could it be something on top of the fridge touching the compressor pipe work? :?
Can anyone help? I have a combi boiler which is currently not heating any water unless I turn the heating on. I have increased the pressure to about 1.4 as it had gone quite a way below 1 but still no joy. I have had to do this a few times in the last 2 years and it normally does the trick but...