28cdi high pressure?

thanks for your quick reply steve,,,
i will try that in morning ,,,,

thanks

paulcfc
December 2008

Drain down the system to 1 bar and with the boiler switched off there should be no increase in pressure if there is then its he water to water heat exchanger.
Again with the boiler at 1 bar pressure run it in CH mode there may be a small rise in pressure .2 to .5,A steady rise in pressure would indicate a blockage,deflated faulty pressure vessel

justeve
December 2008