In an earlier contribution to this discussion,
wrote:

my ideal isar he35 has been fine for the last 6 weeks since fitting
until this week, i noticed the pressure had dropped to 0.75 bar from
the usual 1 bar (recomended when cold) i topped it back up to 1 bar
and it held this until the central heating had been on again, when it
had again dropped to 0.75 bar. This has continued all week it never
drops below 0.75 and works o.k. i can see no apparent leaks and the
pressure release valve has not discharged any water, the maximum
pressure reached when running is 2 bar. The only mention in the
handbook of 0.75 bar is the pressure at which the expansion tank is
pre pressurised at. has anyone any ideas

thanks in advance

I can't explain it - but it if works ok with a cold pressure of 0.75 bar,
and doesn't drop any further, I wouldn't worry too much.
--
Cheers,
Set Square
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