It is preferable to locate the OD unit above the ID unit to ensure that the oil does not accumulate in the evaporator over a period of time.
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when the outdoor unit is higher than the indoor unit or the distance between the two units exceeds 5 meters
Clean your indoor & outdoor coils
The outdoor unit only runs in the AC mode(unless it is a heat pump). If you have the system off and the fan on, the outdoor unit should not be on. You can run the indoor fan only without harming the system.
The thermostat is usually powered by the indoor unit or air handler not the outdoor unit. Or the batteries have died, or the control fuse is blown.
The contactor on the outdoor unit is probably stuck. Disconnect the power to the indoor unit, then disconnect the power to the outdoor unit and take a look at the contactor.
A valve is used to reverse the flow of freon. In the heat mode, the high or hot side gas is pumped to the indoor unit, The low or cold side is pumped to the outdoor unit. The valve is reversed for the cool mode. Pumping cool gas to the indoor unit and hot gas to the outdoor unit.
actually for the a/c have 2 units,one is the indoor unit and the other is the outdoor unit, and there will be a refrigerant gas flowing in between the two units (in the copper pipes) when the refrigerant comes to the indoor unit it comes with a cold format .and when the chilled refrigerant comes in the way of the hot air ,the refrigerant becomes hot and the air becomes cool. (there will be a blower inside the indoor unit to blow the air across the refrigerant pipe's and hot refrigerant now goes to the outdoor unit (i.e condenser), where the outside atmosphere air comes across the hot refrigerant so that the hot refrigerant becomes cool and the cold air becomes hot. so, the indoor unit is maintained in a cool temperature and the outside outdoor unit is maintained at a hotter temperature.
You can use #10 or #12 THHN stranded wire with a 20 amp breaker for the outdoor unit. A disconnect is required within sight of the outdoor unit. The wire between the outdoor and indoor unit should be 14/3 with ground or 14/4 stranded. Do not use solid or aluminum wire for either application.
Benefits of central air conditioning are being able to control the temperature inside of your home, lower level of noise if you have an outdoor unit, and it can improve indoor air quality.
Model number of indoor and outdoor unit needed to compile SEER rating.
That tells me the problem is with the outdoor unit. Most likely a dead compressor or fan motor. Additionally, your indoor and outdoor units are not on the same breaker.