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thanks for the help

So I decided to treat myself to an IR camera, which helped me to find out what the issue was. Essentially, the zones don't match up to the rooms, so by lowering the flow for my office (Zone 4), I was also lowering the flow for my little one's room, which spans Zone 3 and 4 as can, hopefully be...

So I got a cheap IR thermometer and ran the heating for 15 minutes. Measured on the pipes just below the blue manifolds Numbers are for loops from left to right. 1 and 2 are almost off 3 is 3L/min 4 is 2L/min So not sure what's going on here 1 2 3 4 Heating Off 21° 21° 21° 21°...

I think it does move as I can tighten/loosen it and the flow rate changes. I'll have to try the temperature control, see if that makes a difference. I do think I bumped it up ages ago but not sure now

It does heat up and it does heat up the floor, just not very efficiently. I think with all running at about 2l/min and temperatures hovering around 0 C (outside) the room struggles to reach 20 C, whereas the spare room comfortably reaches 21 C There is a single thermostat for the whole floor

oops, tried to quote the previous message and failed :(

We have underfloor heating on ground and first floor and radiators on second floor. The underfloor heating manifolds have mixer valves to drop temperature down. There are two manifolds, one on each floor Heating on ground floor is fine no issues at all Heating on second floor with radiators...