Success! The heating stabilised and I got readings at 8:42am
I also got reading at a radiator Flow-38.8C Return-31.5C
Would you agree this suggests that the problem is with the LLH and not heat losses within the floor slab?
Thanks in advance 
Success! The heating stabilised and I got readings at 8:42am
I also got reading at a radiator Flow-38.8C Return-31.5C
Would you agree this suggests that the problem is with the LLH and not heat losses within the floor slab?
Thanks in advance