I am looking at buying the Senville aura 12000btu Heat Pump with the 16ft option line set instead of the 25ft line set will this unit from factory have to have some of the refridgeant dumped.

I have an 2 zone outdoor unit. 2x 9000 btu Aura indoor units. Both on 16ft lines. When i installed the first indoor unit and ran the setup the system would shut down every few mins and then restart after a while. Error code P6 would flash and the run and timer lights would alternate.
First assumed a defective compressor or so but after hooking up 2nd unit it went away. Seems that hooking Both units up to a 2 zone is required otherwise the compressor sends a fault code P6.

There are many factors in these mini splits.
Was it working previously?
If it is a new install it could be a long line set, low on refrigerant
While in heating go outside and feel the bigger of the two coper lines that should be warm to the touch.
Force it into cooling and a good P.S.I.G. is 125 on the service port.
Last, did tke line set get kinked?
So if in cool you have 125 psig. In heat you have a warm line on the fat coper line at the outsid unit, no kinks and a short line set, Time to call a service technician out.

sounds like you need a new one

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Its too cold outside to work. Therefore the coil needs to defrost first in order to work.

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

Your control switch is most likely the cause here. The one right on the dash that you are turning to adjust the fan.

If I understand you have 120 volts but no 12 volts. Most likely the main 12 volt fuses or switches are bad/blown/off. I would start looking near the house battery and work out from there. Some battery charger/converters have internal fuses that can blow if the battery is hooked up backwards. The 12 volt fuse box usually has a main as well.
Don't forget to look for inline fuse holders and if this is a trailer, look on the tongue for 30 amp breakers near the battery that look like rectangular silver boxes. Some have resets on the ends and others are like fuses.

Did you find a solution to this? as I now have the same problem???

The green thermostat wire goes to the G on the terminal strip. If it's not a thermostat wire it is a ground wire Should be grounded to the metal case for safety. It does not affect the operation.

Is the unit icing up. could have a leak and low on freon.

It's a heat pump and that is how they work. But it shouldn't be cycling so much unless you live in Minnesota? The colder it is outside the more chance that the outside coil will freeze so it will go into defrost. It may be low on charge or have leak as well. Call a tech to verify.