Make sure the filter is very clean. make sure all supply grills are unblocked and open. make sure the indoor fan is blowing. icing coil is normal during heating mode the system will defrost using a sensor. sometimes during cold wet weather the coil will stay iced up. sometimes in cooling mode when it is cool outside 60 degrees or less the coil will ice. low freon will make the coil ice up ,also defrost control not working will cause the coil to ice up
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