Britony Combi SE 80 - Boiler problem

I've got a small problem with my combi boiler. When the heating is off, and i run the hot water, 2 - 3 minutes after I've stopped running the hot water, the boiler starts to fire up for a second then cuts out, and repeats this process over and over again until I press the reset button. I doesn't happen when the heating is on.
I've contacted the manufacturer's technical help team via email, but they say they have never heard of this fault before. I was just wondering if anyone here might have any experience of this kind of thing.
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It best to contact plumbing Service and ask to book an appointment for their service team, the best option and hopefully a quick repair.