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You have to remove all batteries, both outdoor and indoor. Install replacement batteries in the outdoor unit. Back indoors, install replacement batteries in the indoor unit and wait for temperature to be displayed. If nothing happens, the outdoor unit may have failed.
Most air cons now have temperature sensors all over the machine. When it reaches temp on heat cycle, the machine usually shuts down both indoor and outdoor units but the indoor unit will keep running for a few minutes with the fan on only to cool the indoor unit down. This prevents the unit reading the wrong temperature. It stops the sensor(s) reading the heat from the indoor unit rather than the heat in the air in the room.
Running this unit @ such a low indoor & outdoor temp. is going to need an ambient controller. It acts like a rheostat to slow the speed of the condenser fan to keep the refrigerant pressures up so that it doesn't freeze like you're experiencing. The ambient controller can either tie into the refrigerant system reading pressure, or a surface mount thermistor sensor on the exiting condenser coil line to read temperature.
You have a heat pump.
Once the outdoor temperature falls below 36 degrees, heat pumps will sharply lose their ability to heat.
If you are getting a 72 degree indoor temperature when the outdoor temperature is 28-30 degrees, the heat pump is performing up to spec.
On heat pumps, the air coming out of the nearest air vent to the unit should be heated approximately 40 degrees warmer than the air entering the unit.
If you have a 70 degree indoor air temperature, the heat pump should be supplying 110 degree air at the closest air vent to the indoor unit.
Gas heat is a much better heating source where outside temperatures are commonly below 36 degrees.
Even electric furnaces perform better than heat pumps under these conditions.
According to instructions for similar systems, you have to replace batteries in the outdoor unit first, then the indoor unit and wait 10 minutes without pressing any buttons for the indoor unit to begin displaying the outdoor temperature.
pressure readings vary depending on temperature, humidity, and other factors such as coil condition (inside and outside coils) ducting, other mechanical issues. The is no absolute readings for any one type of system, that said a ball park reading with an outdoor temp of 90deg and an indoor temp of 78deg it would be around 65 to 70 psi low side and 150 to 210 psi high side.
Where are you measuring the indoor temperature?
To compare it to the thermostat temperature you have to measure both temperatures at thermostat.
The thermostat will only control the temperature at the thermostat, not any where else in the room.
The room temperature depending on insulation in walls and ceiling and distance from outside wall and outside temperature, can be as high as 10° difference from outside wall to inside wall of house.
The lower the outside temperature, the greater the room difference in heating. The higher the outside temperature the greater the room difference in cooling.
I found this on another Acu-Rite manual:
In case temperatures fall below -4F, bring the wireless sensor indoors and use the included low temperature adaptor by routing the wire out through a soft seal opening such as a window or door. (That way the Wireless sensor is protected indoors in extreme temperatures. Low temp adaptor is used outside to observe temperature.)
take the temp and press reading as per manf. and cal actual superheat. what are the reading for amb, evap temp, pressures high low. Then adjust charge. you need to determine super heat based on dry bulb indoor and outside ambient the read suction line temp vs suction line pressure