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vokera boiler overflow running?

Hi I have a Vokera option combi boiler and occasionally the overflow runs for about a week then stops, any ideas?
Bob Russ, December 2007
There is no visible pressure gauge but hot water and central heating is working ok. The water coming from the overflow is warm.

Bob Russell, December 2007
What does the pressure gauge read when the overflow is running. Is the CH on?.
c

c, December 2007
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