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Combi boiler – faulty pressure gauge or water leak?

I don’t know if my combi boiler and system (a) has a water leak or (b) just has a faulty water pressure gauge. The gauge reads 0 bars when the boiler’s not being used and has cooled down. It reads 1.5 bars if it’s running. The boiler appears to work fine (hot water & heating works) even though the not-being-used water pressure is zero.

Any ideas?

ConfusedOfStreatham
December 2009
had sane problem on ferroli f30 changed expansion vessel ok now

john
January 2016
could be a pressure vessel fault may need recharging, vessel should be about .5 bar when cold, check with tyre gauge if low, pump back up with foot pump you may need a plumber to check this out
same answer for grahamS fault

Denis
December 2009
Ive got the same problems with a Grant vortex, but need to repressure mine every 2 or 3 days. Had no response to my plea - have you?

grahamS
December 2009
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