S7evo

So latest update, hoping I'm not about to jinx the issue... All working although flow appears low but not tripping the sensors ? The flow switch was a rectangular type paddle, looks like it had a small part broken off (maybe inside the pipe, restricting flow?) so ordering a new one. Pipework was altered by placing the flow switch further away, i.e. to the left of the inspection window. Switch is rattling like hell and no adjustment of the dial makes a difference.. will pop a new one in and assess if it still happens. Pump was switched out to test if the existing was failing, but flow was similar. So that leaves a blockage potentially?. Nothing in the filter that's obvious.. Will update if we find anything more. Thanks for the suggestions and help. Currently in a warm home ??

@ProDave flow is reading above 14l/m. Pumps (all 3) are flat out Noted ref the pump head. Will establish the current flow rate of the wilo. It may be failing perhaps.

Worked since 2016 until recently. Was a new build by a small developer. First fault we had was flow when there shouldn't be back in Feb 2019. Been fine since then, now the opposite fault, not enough flow. Only thing that changed was the addition of a new flow switch and shut off valve. Really appreciate the help.

@ProDave Was intermittently tripping, would stay on all month then find it tripped when we come home, sometimes trip after an hour then be fine for ages. Now tripping constant a few minutes after turned on, before any valves are opened, hw/ch requested. Pump is a 7.5m head pump, so should be sufficient??

@JSHarris yes it is adjustable but doesn't make a difference I can see ?. Trips out in all scenarios i.e calling for underfloor, calling for hw, calling for upstairs rads. All together, independently, always trips Thanks

Double checked, we do indeed have a bypass valve on the upstairs heating circuit.

Thanks for feedback Peter. Flow meter is to the left of the green circled switch. There is less than 20mm between the flow meter fitting and the shut-off valve. To the left before the elbow there is about 100mm after the flow meter fitting. What I do notice is that closing the shut-of valve does boost flow above 20l/m. Unsure if this is a faulty valve, or just the turbulence makes it appear the water is travelling faster? Still get the flow rate code after a few minutes regardless... System has 3 pumps: 1- from the ashp to the house (shown) which can feed the low loss header or cylinder. 2 from the low loss header to the upstairs rads 3 from the low loss header to the underfloor system All pumps are reasonably powerful (i think) at 6 - 7.5m head. have them all set to max, have ensured the divert valves are fully open or closed but flow doesn't increase or decrease.. not sure we have a bypass valve installed. Any more thoughts? Appreciate taking time to comment.

Hi all. First post, appreciate any guidance ? We have a Samsung Ashp which provides all our hot water (via immersion when needed) and underfloor heating. We continually get e911 flow issues, and have tested and swapped flow switches to no avail. Having read the some documents for months as can't get a plumber who wants to deal with it, I think it's plumbed incorrectly which may be throwing the flow issues. The switch is on the wrong side of the flow meter, and there should be (but isn't) at least 150mm before any bend or fitting either side, I think. Can anyone clarify that I am correct, or barking up the wrong tree? Setup image attached. Thanks