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Yeh i think its over my head, yeh the overheat stat stops it, so ive turned it off completely. Thanks for your help though,much appreciated

The temp gauge goes to 85-90 pressure goes high and locks out

No the radiators get very hot, so its being pumped around, all rads hot. We live in a very hard water area,but the system was treated with inhibitor.

Hi Just need some advice before i call in local plumber. Our biasi is playing up,the central heating fires up, gets very hot then locks out, pressure also gets too high, about 2-3 bar. Dhw works....sometimes, but very intermittent. Have changed the 2 thermistors and purge valve. Pump runs ok...