Armstrong sx80 a/c not cooling

[onedayjake]

I have a sx 80 hvac and it's not cooling. The blower fan is on, the fan in the outside condenser is on. I checked the resistor that went bad on the last circuit board that went bad, the board was replaced by a havc tech. It seemed to be cooling fine this summer so far. Would low charge have symptoms come this fast? Any help would be great.

[sloooo]

You'll need to verify that the compressor is running. If it is but it's not cooling, chances are you have a low or complete loss of R-22. Also, check your filters. If you have a dirty filter, the coil will freeze over and you will have no cooling also.