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These is because you have not service your air-con for a long time. The cooling fins are clotted with dirt & dusts accumulated for a long period of time, and the water vapour caught between the cooling fins turn into ice when you set lower the temperture for the air-con. Moreover cool air from the blower/fan cannot pass thru', the cooling fins to regulate the cool air into your room.
You have to get the professionals to do a service on your air-con.
To get proper cool, keep the tips as follows: 1. Check air filter is cleaned. 2. Check indoor coil is cleaned. 3. Checkindoor blower motor is working. 4. Keep in cool mode. 5. Set temp minimum 3degrees less than room temp.6.Check compressor is working with correctpressure. Thanks. Helpful?
Either the fan motor outside is bad or the run capacitor for it is bad. One quick way to tell, you just have to be really careful, when the compressor turns on get a long screwdriver and spin start the fan. If it starts turning then simply replace the start capacitor, which more than likely will look bloated. If it doesn't start then you need to replace the motor.
Check the radiator for dirt, and check if the radiator fan is functioning. Do you notice any wetness or ice build up on the outside copper pipes. If so, suggest calling a refrig. tech. to add gas. The gas used is R22 on most aircons.