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pressure drop each time heating used?

we have a ariston 27rffi system boiler in the past two weeks it drops the pressure from 2bar down to zero over night and we have to keep toping up sytem their are no leaks we can see around any pipes or radiators when we use the hot water only the pressure seems to hold can some body please advice us on possible reasons
thankyou ......

steven
November 2009
AristonHeating, Home Heating SystemsTime Heating Ariston
check external pipe for dripping when heating on, if so and does sound like its a expansion vessel fault

ste
November 2009

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