I saw a post about this a couple of months back but I paid little attention to it. The 1, 2, and 3 settings on my ac unit stopped working but the 4 works fine. I need to fix this asap because its hellishly hot out here in AZ and having an ac is a must. Please help

 

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As a Maxima Enthusiast, you should know this by now.

Resistor block...