Where is the reset button on AC compressor?
Usually there is no dedicated reset button on a residential AC compressor. If a reset is possible, it’s typically a recessed button in the outdoor unit's electrical disconnect box or on the compressor itself. More commonly, resetting involves cutting power to the unit at the main breaker or disconnect for several minutes and then restoring power.
Understanding reset buttons and overload protection
The reset mechanism, when present, is tied to the unit’s thermal overload protection. It trips to prevent damage when the compressor overheats or an electrical fault occurs. In many modern systems the overload resets automatically after cooling; in others you may need to power-cycle the unit. Pressing or cycling power is not a substitute for addressing root causes such as restricted airflow, refrigerant issues, or electrical faults. If the problem recurs, a licensed HVAC technician should inspect the system.
Common locations to find a reset control
Outdoor condenser disconnect box
Most residential outdoor units have a disconnect switch or a small box mounted on or near the unit. Some disconnects hide a recessed reset button behind a cover. If present, follow the manufacturer’s instructions to press the reset button after turning power off at the disconnect.
Compressor housing
On a few models, a tiny reset button may be located directly on the compressor housing or inside the wiring compartment. It is typically labeled Reset or Overload and is often recessed and difficult to access without removing a panel. Always power off before touching.
Indoor air handler or furnace cabinet
In central-air systems with an indoor unit, some controls or fault boards can trigger a reset requirement. These are less common for the outdoor compressor itself but can affect overall operation if the indoor control triggers a fault.
Main service disconnect or breaker panel
Many homeowners reset by turning the outdoor disconnect off and back on, or by switching the home’s main breaker off for 5–10 minutes before restoring power. This power cycle can reset auto-reset overload protections and re-energize the system if a temporary fault caused the trip.
What to do if resetting doesn’t fix the problem
If the unit remains tripped after a reset or keeps tripping, follow these steps to troubleshoot carefully and safely:
- Turn off power to the outdoor unit at the main breaker and the disconnect, then wait 5–10 minutes before restoring power.
- Check for obvious issues such as ice buildup around refrigerant lines or restricted airflow from a dirty filter or blocked vents.
- Verify thermostat settings and that the thermostat is calling for cooling.
- Inspect electrical connections at the disconnect and breaker for signs of wear, burning smell, or loose wires.
- Do not attempt to recharge refrigerant or bypass safety switches—these actions require a licensed professional.
If you continue to experience trips or your outdoor unit isn’t running, contact a licensed HVAC technician to diagnose refrigerant leaks, faulty compressors, or faulty electrical components.
Safety considerations and best practices
Electrical work around outdoor units and refrigerant lines can be dangerous. Always shut off power at the breaker before inspecting the unit, avoid touching live terminals, and keep liquids away from electrical components. If you’re not comfortable with the process or the unit shows signs of damage, call a professional.
Summary: In most homes there isn’t a user-accessible reset button on the compressor. If present, it’s typically in the outdoor disconnect box or on the compressor housing. More often, a simple power cycle at the disconnect or breaker is used, but persistent trips indicate an underlying issue that should be evaluated by a licensed HVAC technician.
