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[Solved] Is my Samsung gen6 outside air temp sensor missing a sheath/sleeve?

Papahuhu · 2026-01-14T14:50:40Z

Good afternoon Been having some niggles with cycling and unnecessary defrosts on a newish install. Samsung Gen 6 R32 16kW 1P mono, not getting anywhere fast with installer. Image below is my outside air temp sensor which I would have thought would had a metal sleeve/ sheath covering a PT100 type RTD. What I find on mine is pliable black plastic tube surrounding some type of thinnish wire upto the point where the white cable tie sits, but for the final 2 inches it’s a completely empty plastic tube. I would have expected to see a metal sleeve/sheath sticking out the end. What’s in the picture is wrong, isn’t it? Thanks

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Air Source Heat Pumps (ASHPs)

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bontwoody

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15/01/2026 12:31 pm

@papahuhu I would definitely check the upstairs radiators. If they were locked down too much, that would effect the volume of the system and might account for frequent defrosts and swings by Homely. How long has homely been learning your house?

There are some low cost monitoring options for samsungs which might help you diagnose what is wrong

House-2 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
5kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60

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Papahuhu

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Topic starter 15/01/2026 1:56 pm

@bontwoody It’s been converted from 3 zone GCH to single open loop. All TRVs are fully open (on 5). I’ve bled it multiple times, there’s about 36l/min flow rate which although slightly less than nominal, should be fine.
Homely has been running it since Sept, I was running on “smart” mode but it was causing short cycling (4 or 5 starts/hr), homely told me to switch to “standard”. It went from short cycling to not short cycling but to the “on 50% off 50%” cycle I have now.

Installer is offering to remove the homely and move the Samsung control interface into the habitable area from the garage. What’s the reasonable value monitoring solution please, without the homely it’s not Wi-Fi enabled?

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bontwoody

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15/01/2026 2:03 pm

@papahuhu OK. what about the lockshield valves, have you tried opening those with the TRVs set to max? Are the upstairs radiators a similar temperature to those on the ground floor? Have you got the Heat loss survey, if so does it flag the radaitors upstairs as being undersize for your flow temperature

Have a read of this:

https://community.openenergymonitor.org/t/monitoring-your-samsung-ashp-controller/27638

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Papahuhu

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Topic starter 15/01/2026 2:10 pm

@old_scientist

Thanks. How can it possibly detect frost if it’s not touching the coil please? It’s a good 5cm away from the fins.

The only way I can foresee it might work is if it’s measuring both temp and humidity and using the dew point and mass air flow and refrigerant temperature to calculate the theoretical rate of ice deposition.

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bontwoody

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