If your AC compressor shut off unexpectedly, a reset might get it running again, especially after a power surge, overload, or thermostat glitch. Below is a technician-approved step-by-step guide you can share with your team.
Resetting the compressor helps restore function after minor electrical issues, overloads, or thermostat miscommunication. Here’s how your team can do it safely:
Tools Needed:
- Screwdriver
- Voltage tester
- Flashlight (if outdoor unit is poorly lit)
- Gloves for safety
Step-by-Step Guide on How to Reset AC Compressor
| Step | What to Do | Why It’s Important |
| 1 | Turn Off Thermostat | Stops signal to the compressor |
| 2 | Cut Power at the Breaker | Ensures safety before touching unit |
| 3 | Locate the Reset Button (on the outdoor unit, usually red or black) | Some units have a manual reset option |
| 4 | Hold the Reset Button for 3–5 Seconds | Resets internal circuit (if available) |
| 5 | Wait 30 Minutes | Allows compressor pressure to normalize |
| 6 | Turn the Breaker Back On | Restores power to the unit |
| 7 | Turn Thermostat Back On & Set Temperature | Sends signal to restart the compressor |
Important Notes:
- Not all units have a reset button. Some may require a full power cycle to reset.
- If the compressor still doesn’t start, check for:
- Burnt capacitor
- Faulty contactor
- Tripped high-pressure switch
What If It Still Doesn’t Work?
If the AC compressor shut off and won’t restart after a reset:
- Test the capacitor (often the most common issue)
- Check the contactor and high-pressure switch
- Look for burnt wiring or loose terminals
- Ensure refrigerant levels are within range