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baxi boiler pressure too high?

hi - my combo boiler has very high pressure - I have bled radiaters and it goes down for a few minutes then back up! Can anyone offer any suggestions please??

Thanks
caz, May 2008
Thank you, I will have a look

caz, May 2008
filling loop left open--close it. disconnect it to check its not passing even when it appears to be off.

knackered plate exchanger is second possability but my guess would be filling loop.

iain, May 2008
link Click here to see other fixes for Baxi.