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sorry, you're right, it's 90 degrees not 45. It's been a while since I've been to a maths class :)

Quote: when I turn stat down the springs whirrs back quickly back to the open position instead of closed. - (Open is valve lever vertical position, closed is valve horizontal position). D_Hailsham wrote no, I have not removed the power from the motor yet, when the room stat is turned up...

Hello, Hope you can help. I believe my MPE222 potterton actuator is faulty, I've detached it from the valve. When I turn up stat, the motor whirrs slowly to switch heating on (good), however, when I turn stat down the springs whirrs back quickly back to the open position instead of...

Yes, I can easily turn the valve using my fingers to on or off positions. The reason I used pliers earlier was because the valve was too hot. So all I need to change is the actuator, ACT 222. If I buy a new one, then open the old one - disconnect the wires from the old one, and reconnect...

ChrisR. I don't have the necessary tools to test the voltages on the wires. The only thing I can use to troubleshoot at the moment is my eyes :wink: Yes you're correct, when based on my observation I said that the plastic spindle in the motor spins slowly and the valve slot goes...

Many thanks, Yes, it does look like I need to get a new actuator/MPE 222 (or maybe even a replacement motor?). How easy is it to replace the actuator by myself, with no experience of plumbing. The Corgi man said it would cost, £100 for parts and labour inc. VAT. What do you reckon.

Thanks for the input everyone, :D I've got a bit further with this. If I turn the metal valve on the pipe manually with pliers to the horizonatal off position the burner on the Vaillant thermocompact system boiler goes off, and the status shows: s 07 - water pump over run for a few...

Hi, :) I think we may have a problem with our motorised valve (Potterton MPE222) for the central heating. Could someone please confirm if I'm correct. The symptoms are, that our CH comes on even when the timer is switched off, and when the CH is even set to the OFF position on the timer...

Just got the boiler serviced today. The Corgi guy did some testing and believes its the motorised valve (Potterton MPE222) is getting stuck, as described in Simonds post. The engineer removed the motorised valve off the plate and pipe, and had a look inside, and said he can't fix it, and...

thanks for the replies, I'm going to have the boiler serviced this month, so hopefully, the corgi guy should give it a good clean, and maybe sort the problem out

Hello :) , I hope someone can help with a radiator problem we have. My gas Combi boiler is a Vaillant Thermocompact. My hot water works fine, but I have a slight *problem* with the central heating. All my rads have TRVs (Myson TRV 2 way), each of these is set to their own temp per...