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Thanks Dave, any ideas what it could be?

It's a fully pumped system and the boiler is situated upstairs in the airing cupboard

Hi I have a Baxi WM 60/3 RS boiler, approx 18 years old. Even though we have the hot water & centreal heating on a timer (which has recently been changed), the boiler fires up every so often, at night even when the timer is off. It usually comes on for approx 20 seconds then goes off, is this...