In an air conditioner's dry mode, also known as dehumidification mode, the primary goal is to remove excess humidity from the air without cooling it as much as in regular cooling mode. During this process, it is normal for the condenser (outdoor unit) to turn off and on repetitively.
When the air conditioner is in dry mode, it cycles the compressor (which is housed in the outdoor condenser unit) on and off to regulate the amount of moisture in the air. The compressor cools the evaporator coil to remove moisture from the air, and when the desired humidity level is reached, the compressor turns off until the humidity increases again.
This intermittent operation of the compressor helps maintain a consistent humidity level in the room without overly cooling the air, which would happen if the compressor ran continuously like it does in regular cooling mode.
So, if you notice your air conditioner's outdoor unit turning off and on repeatedly during dry mode, it is generally considered normal behavior. However, if you observe any other unusual noises, excessive cycling, or performance issues, it's a good idea to have your air conditioner checked by a professional technician to ensure everything is working as it should. Regular maintenance can also help ensure the efficiency and longevity of your air conditioning system.