Programmer says OFF but boiler is ON

8 Sep 2005
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United Kingdom
I've got my combi boiler programmer set for heating permanently OFF (it's summer!) and water on/off three times a day. However, during the water OFF times, for example, in the middle of the night, the boiler fires up for about 30 seconds then goes off again. This may happen several times a night. Is this normal? or do I have a fault some place?
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My Ferroli Falcon boiler does the same thing. According to the user manual, this is entirely normal and when in summer mode the pump is turned on occasionally to make sure everything works.

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