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Brilliant! This is a really good explanation of what should happen. I've printed it out and am taking it to bed with me for a good read to try and understand it. Thanks. Geoff

Hi Mandate, Thanks for the reply. When the cylinder stat is turned down or if the HW is off at the timer, the grey wire is in fact 240v. When the cylinder stat is turned up, I still get 100v on the grey wire and 240v in the orange wire. So it seems that the grey wire is getting a voltage...

OK Matt, this is what I found. Disconnected the wires as you said, room stat down, cylinder stat up and CH and HW off at timer: Orange = approx 7v to 8v Grey = 248v Brown/White = approx 19v Turned HW on at timer: Orange = 248v Grey = 100v Brown/White = 29v Turned cylinder stat...

Matt, This is just what I need to check it all out - thank you. It was definitely the cylinder stat I changed, as that is in the airing cupboard where I was working. The room stat is downstairs and I had already turned that down to around 16 so it wouldn't cut in while I was checking the...

Thanks Tony, I don't think it's jamming or sticking at A in the conventional sense, as it returns to the HW position B when power is cut. It appears to be that the microswitch is either; a) still receiving a signal to keep it at A when it shouldn't, or b) NOT receiving the signal to let it...

I suspect the Danfosss HSA3 Actuator on my 3-way motorised valve, but before replacing it, I'd like to run through the symptoms to see if it might be a problem elsewhere (I had a new Vaillant ecoTEC 428 boiler installed last year, so I want to rule that out first). The problem is the house is...

I suspect my Danfosss HSA3 Actuator, but before replacing it, I'd like to run through the symptoms to see if it might be a problem elsewhere (I had a new boiler installed last year, so I want to rule that out first). The problem is the house is getting too hot. Today, the room stat was off...