On Tue, 03 Feb 2004 00:30:18 +0000, Richard Markham wrote:

If my system pressure goes from 1 bar cold to 2.3 bar hot, Have I got a
problem with the expansion tank?

Possibly, see FAQ below.

--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html