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Many thanks TWGAS for your help.

Thanks for all your replies. But what I really want is either someone to draw me a diagram with both frost stats connected to an S plan or for the moderator to reinstate my previous topic.

Yes I put the frost stat there as a safe guard to protect pipes and tank. I live in a bungalow.

I have an S Plan layout with a frost stat in the garage with the pipe stat on the return to the boiler(which is also in the garage) connected to CH motorised valve and a frost stat in the loft with the pipe stat on the return from the HW tank just before bypass and connected to the HW motorised...

There is a wiring diagram showing 2 frost stats which I would like to revisit as I am having problems with. I am not a commercial site. I am able to get the transcript of the topic if I use search by author, but not the pictures.

//www.diynot.com/forums/viewtopic.php?p=2113733#2113733 Topic Post does not exist Why?????? Useful wiring diagram

Topic post missing

Thanks Holty,I have since read somewhere else that the pump can be on the return.What do you mean by "as for the rule of thumb on the trv, what!"

I have drained off the system and replaced all the TRV's with Bidirectional ones.Water was clean from both drain points and although no more was draining off,two rads had water in them.One of them had really dirty water in it.Connected everything up,bled the rads,pump and system and guess...

We live in a bungalow and our pipework is under solid floor so we're not completely certain of the flow of the radiators or wether we have a one or two pipe system.We moved in 2 yrs ago so have inherited this system.We have always had some rads very hot,some warm and one cold(furthest...