Vaillant TW3 boiler keeps coming on and off by itself

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I have an old Vaillant boiler CW 25 T3, which keeps coming on and off of its own accord can any one help with this problem
 
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I am not sure as the boiler is located 200 miles from where i am at the moment. If the switch is on would this be the cause and if so how often does the boiler fire up in this position.

thanks

Mal
 
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Hourly at this time fo year increasing to every 15 min during cold weather if the heating is off and its external ambient inside.
 
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