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Thelia 623 high pressure?

I have a Saunier Duval Thelia 623 and although it fires up when i turn on the hot tap, it is refusing to come on to heat the radiators. It was becuase of low pressure initially so i let more in up to about 1.5, but it now seems to be rising of it's own accord and the heating will come on in fits and starts in a random fashion and i don't seem to be able to control it. Any help appreciated. Thanks

Hugh
January 2009
Saunier DuvalHeating, Home Heating SystemsHigh Pressure Hot

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