Nickos

Yep, arrow on the side is shows downward so it's pumping the hot flow. I can also see the flow temp is 45 and it's coming back at 37c ish on the return. 2PV also correct direction.

I can't get full flow on any circuit, even with all others closed other than that 1. The most i can get is around the 1 lpm mark. It was installed and commissioned a few years back but i believe the installer who did it wasn't brilliant. When i flushed and filled it a circuit at a time recently, i did see the flow meters drop as low as 4 lpm so i know they are not stuck.

Yep, checked that too. I'm hoping it's something simple but it's a weird one! Thanks for the help so far.

Yeah, went through all their videos, even flushed the system twice just to be sure. Did call a couple of plumbers to take a look but most must be snowed under or just don't want to know.

That was my initial thought but spoke with polypipe directly and they advised even on auto flow, the rates should show correctly. I.e. the kitchen flow meter should read 2.5. Its a total mind bender but will try changing the mixer down to 40 next. Boiler flow currently at 60c. Not sure about how water temp, I'll have to do some reading but it seems scorching. Didn't bother me tuning wise when gas was 2.5p kwh but at 4+ times that it's hurting the pocket so I want it optimal as can be.

Not wrong, just a little poor as the pipes go behind the tank. I've adjusted them all, one at a time, variations and nothing. Can never get anything above 1ltr per minute, whether it's open/closed to whether top manifold valve is set to 1 lpm or 30 lpm. Loop lengths are: Room Circuits Length Width Room Sq Mtrs Sub Room Totals Total Meters Per Circuit Flow Rate (m/40) Manifold Setting Lounge 2 5.38 3.55 19.10 19.10 98.98 2.47 14 0.00 Kitchen 2 3.84 3.28 12.60 23.03 99.94 2.50 14 3.56 2.93 10.43 Hall 2 3.89 0.85 3.31 12.83 66.45 1.66 10 4.27 2.23 9.52 Bedroom 2 3.78 3.06 11.57 11.57 70.70 1.77 10 0.00 Bathroom 1 1.78 1.7 3.03 3.03 43.22 1.08 6

Do i perhaps need an extra pump between the boiler and ufh manifold ?

I couldn't see any reference to switching it to constant although i did change the mode to PWM 7m which increased it a little but still not over 1Ltr on the single zone (2 circuits) i have calling for heat.

I pushed the button to view the mode. I can see when the UFH is running that it does change between 25-50% (1 green, 2 yellow) and 50-75% (1 green, 3 yellow) performance view operation status. I've never seen it reach 100.

I assume it must be as the floor does get warm, and i can see the mix flow and return temps change. I did hold the manual bit on the end down and saw no change. Yep, it's pressurised although the UFH is fed straight off the boiler.

Hi Guys, I've got a polypipe UFH system that serves 9 circuits of varying length that currently is barely registering any flow, i can never get it to go above 1L. Pics attached as well as one of the pump operating mode. I've tried: Flushed the whole system as per the manual and there is no air present in any of the circuits. Open and closed circuits. Changed the Auto Flow lpm on the top of the rail beneath the actuator. Any suggestions what to look at next ? I've also tried to draw the system in to assist with any advice although some icons might may be slightly out as it's all i could find.