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Also, just put the heating on and the bottom valve is now stuck on the left hand side and won't move back

'blonde question' Is the valve you refer to a white box attached to the pipes? I have two of them (says valve actuator code on front). They have a sliding black switch on the top and a button on the side. I just pushed one of the switches from right to left, it then 'motored' back to the...

Hi Thanks for your reply. I wll have a look through the FAQs.

Hi My first post so please bear with me !! I have an unvented water system and currently no hot water. The rads are heating ok but water stone cold. There is a Grundfos pump near the tank which is quite noisy and gets very hot when the water is turned on for heating at the boiler. I...