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I think there are 2 circuits coming off the manifold, but its 1 'zone', so i have 1 control unit that controls all - 1 setting for all - basically, ufh is in my newly built extension. Posting photos.

Latest update: - I switched a couple of rads off on tuesday by the TVR - didn't seem to make much diff - I turned the UFH off tuesday night - this made all rads as hot as they should be :) - Weds morning, turned the water on - rads still all fine - weds afternoon, turned 2 rads back...

Ok, i'll adjust it, but sorry, I didn't mention before, there is also a separate control thermostat in the extension that controls the UFH temp and i know it works as i can hear it clicking on and off when it hits the set temp.

Ok, my rads are piping hot and even my plinth fan heater in the kitchen has come on now the UFH is off, though I was advised never to turn the UFH off? I'll leave if off tonight to get the house toasty and turn it back on in the morning and try what you've suggested. Update - just gone...

I've switched off the UFH, will let you know what happens. Photo of UFH pipes coming

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boiler

Ok, yes. i need a heating engineer. This is my problem - none of my friends or family can recommend any to me. Not sure if i'm allowed to ask on this forum? Can anyone here recommend anyone in the Harrow area?

I'm not a plumber, so trusted them to spec what i needed for the house. I'm not sure how exactly the UFH is connected. Theres a separate manifold. I'll post a photo if it will help?

Then could it be true that my rads need a power flush then if it may not be circulating? what do i need to get done to fix the problem? My plumbers who fitted the whole kit decided the spec. It does also run the underfloor heating in the extension. was only fitted 2 years ago.

When running at S 4 both pipes are piping hot the flow pipe on the left is almost too hot to touch and the return pipe is very hot but not as hot as flow pipe. When in S7, they both are still hot (hotter than my rads) i wouldn't call them warm - still hot. Then its re-ignites etc back to S 4...

Any ideas out there? Do I need to get my rads power flushed? Any settings I can change? what does S 7 - pump overrun mean? Is my pump not able to cope?

have turned 2 radiators off now in the rooms i'm not using, seems to have helped by 1 degree.. I also get the flashing radiator sign when theres an S8 status

Hi, thanks for the response. Yes, it ignites - theres a solid flame sign and the rads are getting warm - not hot.