How to Reset AC Compressor​? Step By Step Guide

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