Clean the coils dirt blocks air and causes freezing or fan over heat ===with a spray bottle [water little dish soap ] and unit on fan remove filter and spray the coils the fan will suck the spray through coils do not wipe the coils they bend easy and are sharp keep spraying a few times to clean it then turn back on when clean air moves better and filter light should go off
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Clean the coils dirt blocks air and causes freezing or fan over heat ===with a spray bottle [water little dish soap ] and unit on fan remove filter and spray the coils the fan will suck the spray through coils do not wipe the coils they bend easy and are sharp keep spraying a few times to clean it then turn back on when clean air moves better and filter light should go off