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NetihV

Intergas Boiler (only 2 years old and serviced each year) pressure dropping to 0b after just 1hr of running - can anyone help? No leaks anywhere
 
Check the pressure after running and see if it increases from say 1 bar to 3 bar, if this is the case (sound likely) then you might have a blocked communication hose from boiler to expansion vessel. That or your prv could be passing.
 

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