Is it an anti freeze function? Some ASHP's run the compressor to do this (mine does) but I think some 'steal' the HW, including Samsung. From the Buildhub forum.
"Calling all owners of Samsung Gen6 ASHP (maybe others too). I have found on my system that when the exterior temperature drops to 2deg or below, if the pump is not working for heat/DHW, it enters a frost prevention programme where it runs the main circulation pump and operates the DHW valve. This means it is sucking heat out of your hot water tank to prevent the external unit getting the shivers. Quite why is the good question when mine and I suspect everyone's is filled with antifreeze protector. We've posed the query via our contractor to Samsung as the contractor is as puzzled as I am as to why it should do it. I discovered this by accident as I set the internal overnight temps back a degree or so at 22:00. One frosty night walking past the kit cupboard at 24:00ish I heard the circulation pump running and discovered this. On a fully cold night it takes around 8 to 10 degrees # out of the hot water tank (400l). I've now bypassed the DHW valve with a switch so it pulls it out of the buffer instead whilst we wait for Samsung to reply. Note the pump runs several times a night for around 5 mins a time."
Is it an anti freeze function? Some ASHP's run the compressor to do this (mine does) but I think some 'steal' the HW, including Samsung. From the Buildhub forum.
"Calling all owners of Samsung Gen6 ASHP (maybe others too). I have found on my system that when the exterior temperature drops to 2deg or below, if the pump is not working for heat/DHW, it enters a frost prevention programme where it runs the main circulation pump and operates the DHW valve. This means it is sucking heat out of your hot water tank to prevent the external unit getting the shivers. Quite why is the good question when mine and I suspect everyone's is filled with antifreeze protector. We've posed the query via our contractor to Samsung as the contractor is as puzzled as I am as to why it should do it. I discovered this by accident as I set the internal overnight temps back a degree or so at 22:00. One frosty night walking past the kit cupboard at 24:00ish I heard the circulation pump running and discovered this. On a fully cold night it takes around 8 to 10 degrees # out of the hot water tank (400l). I've now bypassed the DHW valve with a switch so it pulls it out of the buffer instead whilst we wait for Samsung to reply. Note the pump runs several times a night for around 5 mins a time."
There wasn't a solution offered on that forum.
Hi Kev,
It would appear that you can deactivate the 'freeze stat' function as shown below.
Freeze stat function Menu subtitle Function/ Description Freeze stat function *1 An operational function to prevent the water circuit from freezing when outdoor ambient temperature drops. Flow t. The target outlet water temperature at water circuit when operating in Freeze stat function. *2 Outdoor ambient temp. Minimum outdoor ambient temperature which freeze stat function will begin to operate, (3 - 20ºC) or choose**. If asterisk (**) is chosen freeze stat function is deactivated. (i.e. primary water freeze risk)"
*1. When the system is turned off, freeze stat function is not enabled. *2. Flow t. is fixed to 20°C and unchangeable.
Also I watch my app a lot and know when my hive heating for example says it's over target temp so if spiking when heating a few ° over thermostat set point its not the heating.
Where is your wired remote control unit located. If this is in an unheated space, this could be contributing to the problem. I see it was showing 12 degrees in your image you posted. If the pump is seeing 12 degrees indoors and sub zero out doors, that may trigger some protection mechanism.
I will try track down where I saw this discussed before (for the Samsung) and post back once I find something.
@william1066 it's in the loft. However it's using our hive and as the heating is not actually working today that is actually the correct reading for the living room at the moment. Brr!!
I know. But you mentioned that your system was running the water pump on occasion, so I thought that I would point out that it would appear that it can be deactivated.
@lfranklin Crumbs, 12 is a bit cold for inside, esp if working from home.
I found the following on this site https://tempex.bg/en/blog/samsung-ehs-heat-pumps..... but I can't find the information where they recommend installed the wired remote controller in a heated space or any reference to this 3 degrees in a manual anywhere. Though as per your posted images, there is a freezing control - though not seen that mentioned anywhere in the manuals. As we chose to install anti freeze valves, I am ok with this function, but am not sure it should switch on the compressor.
Our 16kw Samsung Gen6 was installed in Dec 2022, and I have had one occasion when the flow temperature was very high [65] for a while with no DHW demand though the DHW valve was diverting. It did not happen again, that I am aware of. If it does, I will report back.
@derek-m alas no option on the Samsung wired controller that I can find.
The option does not exist. My unit just kicked in a couple of minutes ago. No compressor activated, outside unit only using 100w, just sucked some heat out the cylinder and ran for about 6 mins. Outside temperature at the time this kicked in was about 1.1 degC and my wired remote controller is in my boiler room (very warm room). Very interesting, thanks for starting this thread, I now have another issue to contend with 😀
Well my heating stopped all together today despite pump running and eating lots of electric!
Seems the DHW not getting up to temp and so not letting the radiators have hot water.
At my wit's end with it at the moment.
Heating was on for 11.5 hours today (since 9am)
and didn't get above 15.3° !!! 🤬🤬
I suspect starting and then stopping your heat pump is not going to get your home up to temperature and keep it there. Starting up from cold is going to use a large amount of energy, which should then start reducing as the building fabric warms up.
The next mild day, it may be worthwhile gradually bringing the indoor temperature up, 1 degree at a time , and recording any measurements that you can, then post the details on the forum for analysis.
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