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I have replaced the motor and everything is fine so far. Thanks for the help my friends. 8)

It is malfunctioning and, although the problem could be rectified with a new motor, the valve is pretty darn old now, so if I can get a new valve fairly cheaply then I will.

It needs replacing. It's a Honeywell, it's a three way job, it's got a "pimple", it looks like a v4073a, but I cannot find "v4073a" printed anywhere. Inside the cover it says "Sundial Y plan 3 Position Diverter Valve." Also "Made in Canada 40003279-002" On the front of the case it...

I have now jammed the valve all the way over to the right side (further than the manual switch can take it) and I have CH wthout HW. Survival is now guaranteed. Now to find the problem - is it the motor or is it the wiring? I need to know how to test the motor. Can anyone help?

I don't have anything to test the resistance unfortunately. I'll see if I can give it 230V. Fingers crossed, but not wires hopefully. :)

I hope someone can give me more help. I have now removed the valve head cover and removed the motor from its mounting, leaving it wired up. I can see the motor gear, but nothing I do can make it move. CH - nothing, HW - nothing, both - nothing. I can move the gear with my fingers, though it...

I cannot hear anything from the motor on the valve when I try to switch on the CH. Incidentally the valve is called a Honeywell 8951. There is no mention of V4073 anywhere on the box. In the boiler instructions it is called a Honeywell V4600C 1029. It looks just like the Honeywell valve that is...

Thanks for those replies. I am now beginning to close in on the problem. By forcing the switch on the valve (Honeywell, silver box in the airing cupboard) to the right and keeping it held down I can can fire up the boilers with the CH switch and get heat into the rads. Woo hoo. If...

I have a 20-odd-year-old Baxi Bermuda 401 Gas Central Heating system. When I try to switch on the heating, nothing happens. No click, no thump, no woof from the boiler lighting up, no big flame in the boiler, no heat in the rads. I do get a light on the Honeywell ST699 controller. The room...