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    Boiler when shuting off sounds like a back flush/gushing

    Have a Potterton Combi 80. When the Boiler is used (pulling hot water/shower etc) and then the hot taps are turned off, Then boiler makes a backflushing/gurging/gushing noise - reasonably loud. It often locks the boiler out, and you have to reset. Any thoughts on what that is?
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