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I've compared how tight spindle is in new valve and in old one... I'd say they look the same. I took a flat screwdriver and pressed in and out. It doesn't seem that cartridge is seized. Another thing is that i've put new actuator in parallel to valve. Old one was 90 degree( perpendicular...

Hi Everyone, Few weeks ago my Potterton Suprima 80 started to behave incorrectly. It simply couldn't stop and kept running even when CH and HW are both set on oFF. The only way to stop boiler from running was to manually turn off the boiler. Boiler engineer has found the issue relatively...