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Ariston micro Genus boiler HE 28 MFFI?

Pressure it keeps falling to zero and every morning I have to bring it up to about 1.5. It does shows error code 02 which means low pressure according to the manual. Why is it that falls to zero overnight? The boiler is about five years old.
Bob, December 2013
either a leak on system or boiler

http://www.youtube.com/watch?v=uPPUPftBI58

Q, December 2013
link Click here to see other fixes for Ariston.