Q: HVAC is not working right

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My heating, ventilation, air conditioning system isn’t working right. When I turned off the air conditioner it would come right back on and the fan would go faster. If I turned it up higher the fan would go faster and slower and faster and slower. The RRR mode selector is working, but the white lights aren’t on two of the switches. Do you know if I can fix this myself or will I have to replace the system?

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