I have a Samsung EHS Monoblock 12 kW system (model AE120BXYDGG/EU) with a Grundfos UPMM 25-95 130 (PWM-controlled) circulation pump and a 200 L buffer tank. I’m experiencing humming and vibration noise inside the buffer tank whenever the compressor starts and the circulation pump begins to run. Th…

Good news - Seems issue was related to outdated software that was not respecting inverter pump 70% value (even if user sets 70%, it still used 100%). Software update to latest version seems to fix it, water flow now smaller on 70% and no annoying sound. Will monitor it next few days. To fix the issu…

Sound like a strange situation. Have the installers used flexi pipes to the outside unit to reduce the amount of vibration being passed inside? Is the outdoor unit wall mounted?

Outdoor unit is floor mounted, see the pic Proton Drive , not sure which pipes are used. Update - Buffer tank valve is more than half closed. Water flow 25lpm when compressor running. I can hear more clear sound of incoming water, but still Whistling/annoying noise included. If i could somehow tune…

When the system has running have you tried turning unplugging the pump to see if the noice is still there (only for a few seconds). I would presume it would be. This would tell you if the vibration was coming from the compressor or the water. But based on your pipework it sorta looks a bit undersiz…

Thanks for the photos. Unless I’m mistaken It looks like the system has been plumbed in 28mm MLCP which has an internal diameter similar to 22mm copper. With 30L/min going through, it will result in high velocity and hence noise. Partially shutting a valve is not a great solution, since this will c…

Thanks for the answer. No good way to separately unplug the water pump, it somehow connected to Samsung controller. At least I`m not aware of. In that case I need to switch electricity off for entire system

Thank you. Could be they sold too powerful system for my house. I have 240 m2 to heat if done in fully and my understanding was 12kw is up to 250m2, hence such choice. How to “decrease” the power from 12kW? Is it possible to tune the PWM settings for water pump so that it works with less power? Or s…

Or right I had presumed the pump end would be on a removable plug like alot of them are these days So your heat pump will have a min compressor speed/power consumption. I, Without looking it up fully I think you’re looking at a 900w compressor min consumption. Given a cop of 3 to 4, that’s 2700W to…

I bought a 3rd party PWM controller to control my Grundfos pump when I was having PWM issues from the Samsung controller. I’m now using it permanently to set a fixed pump speed which I’m happier with than the Samsung PWM controls. You have to wire the primary pump to the secondary pump terminals in …

[image] mrsimonbennett: Or right I had presumed the pump end would be on a removable plug like alot of them are these days So your heat pump will have a min compressor speed/power consumption. I, Without looking it up fully I think you’re looking at a 900w compressor min consumption. Given a co…

This is interesting, thank you for sharing. Do you have photos available of your set up(especially wires part what is connected where)

Samsung EHS Monoblock (AE120BXYDGG/EU) – Circulation Pump Noise

Hardware Heatpump

glyn.hudson (Glyn Hudson) 21 October 2025 22:00 25

That’s great! I had the same issue with my Samsung heat pump

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