To fix an AC unit fan that stops spinning, you will need to clean the filter or replace the filter with a new one. The main reason that an AC unit fan stops working is due to contamination of the AC filter. Dust particles gather over a period of time which leads to a blockage of the filter. This problem is common with outdoor AC units.
When the filter is replaced and the fan is still not spinning, try troubleshooting other problems that may cause this. The first thing to look at is the mortar of the fan. Ensure that it is still working properly. If not, call a professional to fix it or replace it. Another reason the fan might have stopped is wiring issues. The wiring that powers the fan to the AC unit may have been tampered with. In this case, you should call a professional to fix this for you.
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