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Assuming that the whole coil is icing up then this is not defrosting, so that is a cheap issue to fix. You should hear the fan running-it's bad if it's not. The most probable problem is an open defrost heater and you can easily check it for continuity with a meter. The heater is easily replaced as well as anything else that may be keeping this from defrosting.
OK. It should not be an expensive repair. If you want this to work properly for now just fully defrost the coil and you should be good for about 4 days until it needs to be done again.