ASTA18LCC inverter heatpump constantly de-frosting even if temp

Heatpumps are more complex than an AC unit. Yes, there is a difference between a heatpump and an air conditioner. Where the real difference lies is out side in the condenser unit. There's a defrost board out in the unit, and depending on the brand and model, one of the wires will need to be changed so that the gas furnace will not come on. The problem with this, heatpumps use the heat that is available from the outdoors and transfers it to indoor. When the temps outside drop below 50 degrees, there's not enough latent heat to transfer, thus calling the propane furnace to operate. Without the addition of the furnace, you will not be able to heat the area properly. The only way to remedy this, is to remove the propane furnace and replace it with an electric airhandler with a heat strip for "emergency heat". The emergency heat term is used when the temps drop below the temps I mentioned above and calls for the heat strips to come on.

Sounds like you got it. Water is freezing up the wiper motor or wiper transmission at a certain temp due to water leakage in what is supposed to be a sealed area. (inside wiper motor, wiper trans linkage). "SOUNDS LIKE" water may have seeped in the moer seal & froze it or stripped the gears of the wipers? Good Luck Frank M

with door closed insure the door seals are making contact with fridge even the slightest deviation can cause this ..if that is good next measur the temp in the freezer(4 degrees above zero) and the fridge(37 degrees) and last if this is good check to ensure unit is defrosting

Replace the temperature sensor in front of the radiator.

your drain is clogged and the sides heat is normal its frost free so when opening and closing doors moisture wont settle around doors

Google it.

Turn off the heatpump. Start it again when temperature gets hotter than -20c.... Error C4 or CA (overheated compressor) often strikes after C2 error (and this error you often get when temp is belov -25c)
I had the same error myself, temperature was below -27. I turned the heatpump OFF. Turned it on again when temp was at -8c. No errors in display, and runs great! :-)

Your outside unit is not defrosting. You need to call a service tech to check it out. Defrost board sensor or low on gas. Also you amy have an outside tstat that is not working correctly. Rus

The fridge should be just above freezing, maybe 2 or 3 degrees celsius. The freezer should be around -15 degrees celsius. The outside temp doesn't matter as far as the settings go.

check the outside drain in the pan if there is a plug in the bottom pull it out.the ptac unit will go into emergency heat and run more the colder it gets outside