That’s normal operation for a Samsung! Daikin’s do this as well, I don’t think it’s anything to worry about.
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This has all been fascinating to read. I’m having an 8KW Gen 7 installed in a couple of weeks with OEM heat pump monitoring and a homely controller installed. Can’t wait to tinker. (Installer’s worst nightmare)
Ian, I hadn’t seen yours come up on HPM before, but I’ve now bookmarked it and will be keeping an eye on it. 
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Hope you can play with my MQTT bridge to even deeper tinkering
@IRMartini I see you have the same model of heat pump as me, can I ask what PWM circulating pump you are using? I have a Grundfos UPS3 and am struggling to get it to work in PWM mode.
No problem, I’ll take a look as soon as I get home 
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Hi Martin, just a friendly reminder to check this (presuming you get home this evening)
Thankyou 
Is that pump a PWM pump? Does it have additional PMW connection wires?
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I thought only some model of Grundfos will work for PWM, this is my PWM pump:
Ah cool, great stuff. PWM is definitely working. That’s interesting that Wilo pumps can be used for PWM. Assuming that’s the primary pump on your system? Do you have a buffer tank? Is that pump on the heat pump side of the buffer tank?
Some versions of the Gen7 R290 have the primary pump integrated in the outdoor unit:
That is the only pump in my system, no buffer just a volumiser and there is no pump in the outside unit. my specific unit is: AE080CXYDEKEU
Great stuff, thanks for clarifying