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Thanks, the system was quite gurgly when operating - as if there is air in the system, after I re-charge the vessel it shuts up. I have bled all the rads How do I check the pump over-run is functioning correctly? - just the 'screwdriver' test For the pump to over-run, does it have to be...

Hello to all at DIYnot Forums, this is my first registered post, this looks an excellent DIY Forum!. I have the Dreaded Potterton Suprima Lock-out problem, that has been occurring on a random basis for a good while. I have checked the Thermostat & temp sensor & they seem to function ok...