Humming Noise from Potterton ProMax Combi

2 Feb 2016
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United Kingdom
When I put my CH on once it's warm I start getting a really annoying humming noise coming from the boiler. It's not a rattle but more a large hum which can be heard from most of the house even upstairs. If I press the side panel of the boiler in at the bottom with a bit of pressure the humming stops. As soon as I let go it starts again. If i pull the side panel at the bottom out a little it also stops. Any ideas what this can be and how I can fix it?
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