Overflow on a combi boiler

Joined
21 Apr 2005
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Location
Bedfordshire
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United Kingdom
I have a Glow worm combi boiler and if i have not used the heating for a day (approx) the overflow runs constantly until i put the heating on for a few hours then the overflow stops. Help please.
 
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:idea: filling loop letting by slowly and when heating goes on expansion vessel on combi faulty discharges water from prv letting pressure go down.
then system starts filling up again due to filling loop letting by when pressure reaches 3 bar prv leaks

what boiler and what are your pressure gauge readings before and after ch go on/off
 

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