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I wouldn't drain down for this unless you think the valve body is in need of changing too!! Check the spindle as advised. 9 out of 10 times it will be ok. Get a new Iflo/Drayton actuator and swap in no time, no hassle.

Agreed, apart from the pressure bit. Is it open - vented at the moment? ie header tank in the loft? A bit of prep work would be advisable. How do the rads perform at the moment? What's the state of the water in the tank? Could you introduce a couple of litres of gentle system cleaner for a...

The diverter valve actuator sticking/failing is a common fault imo. Do you have the Manufacturer's Instructions? Two types of actuators are used and you'll need to identify which type you have. And indeed that it is faulty. Part numbers are listed in the MI's. These can be changed without...

L1 and L2 are inside the black electrical connection plug. Follow the cables into your boiler underneath and you'll find it. Note colours of existing connections to L1 and L2, remove and link between the two. Be sure to isolate electric when working on it! When you turn back on you should get...

Strongly suspect 3-port mid position zone valve stuck in hot water only position or central heating 2-port zone valve stuck in closed position. Can you see this valve? In the airing cupboard maybe? Black cable going to it. It should have a manual open position that you can move the lever over...

Blue to terminal 4 (neutral) Bare core to earth terminal on backplate or unused. Should be sleeved. Try Red to terminal 1 and Yellow to terminal 3 (normal) or Red to terminal 3 and Yellow to terminal 1 These should be the only two options. Which setup made it work before...