Recent content by Keith77

Its quite possible to get a high voltage if there is an inductive load and the supply is rapidly switched on and off (buzzing noise may indicate this is happening). The back emf as the current through the inductor is turned off can be a lot greater than the voltage under load.

Just an update... I finally got the time this morning to fit a new diverter valve and it seems to have cured the problem. With HW only on, the B outlet is hot and the A outlet isn't, as it should be. Thanks everyone for the help.

Same, but with no jerk - I was expecting the spindle to rotate more, I presume the CH+HW is midway between the two positions? I tried setting the spindle in both positions and checking if the radiators were getting hot, and in both positions it seems that hot water is pumped to the...

Thanks D_Hailsham. The wiring should be correct as nothing's been changed here, and up until the last week or so the CH was definitely not coming on. It's been off all summer, but was turned on briefly a couple of weeks ago, then off again - so I suspect somthing happened then. With the...

OK, got to the spindle, it moves only a little before meeting resistance - maybe 20 degrees. Not sure how hard to try and move it - should it be easy to turn?

Sorry twgas, yes its a brown to the controller not blue. OK a good tug and the cover came off, it looks like the valve is stuck in the mid position (makes sense, that is CH+HW on) as changing the programmer settings does nothing. Can't see easily how to check if the spindle is free to move...

There is a dimple on the valve cover alright - have undone the screw but its not obvious how the cover comes off - does it slide off lengthways or just pull off?

Thanks I will check it. Also, the thermostat on the HW tank has 3 wires coming from it, one (blue) connects to the valve orange wire, one (yellow/green) to the valve grey wire and the other (blue) goes off to the controller. This seems a bit odd to me - is this normal?

Hi Folks, this is my first post here so please be gentle! The last few days I have noticed that whenever the HW is on, the radiators are getting hot too, this is with the programmer set to HW only. I've done some tests and wondered if anyone can point me in the right direction... The...