Goodman AC Unit Will Not Turn On Breaker

Quick answer

If your Goodman AC unit won't turn on at the breaker, first check the circuit breaker for tripping or damage. Ensure the unit is receiving power and the thermostat is set correctly. If the issue persists, inspect the contactor, capacitor, or electrical connections for faults.

Confirm the symptom

• AC unit does not power on when the breaker is on
• Breaker trips immediately or won't stay on
• No power to the thermostat or indoor unit
• No humming or clicking sounds from the outdoor unit
• Breaker appears intact but unit remains off

Tools and prep

• Voltage tester
• Screwdrivers (Phillips and flathead)
• Flashlight
• Safety gloves and goggles
• Thermostat manual
• Electrical tape
• Owner's manual for the Goodman AC unit
• Turn off power at the breaker before starting any inspection

Step-by-step troubleshooting

1. Check the Circuit Breaker
   Do: Locate the circuit breaker for the Goodman AC unit and ensure it is in the 'ON' position. If it has tripped, reset it.
   Observe: Breaker stays on and AC unit powers on.
   Means: The issue was a tripped breaker.
   Next: Monitor the unit for normal operation.
2. Inspect the Breaker for Damage
   Do: Visually inspect the breaker for signs of damage, burning, or melting.
   Observe: Breaker shows visible damage or discoloration.
   Means: The breaker may be faulty and needs replacement.
   Next: Replace the circuit breaker with a new one of the same amperage.
3. Test for Power at the Unit
   Do: Use a voltage tester to check for power at the electrical connections on the outdoor unit.
   Observe: Voltage tester indicates no power is reaching the unit.
   Means: There is an issue with the electrical supply or wiring.
   Next: Trace the wiring back to the breaker panel for faults or loose connections.
4. Check the Thermostat
   Do: Ensure the thermostat is set to 'COOL' and the temperature is set below the room temperature.
   Observe: Thermostat settings are correct, but the AC still does not turn on.
   Means: The thermostat is not the issue.
   Next: Move to the next step to inspect the contactor.
5. Inspect the Contactor
   Do: Open the outdoor unit's access panel and locate the contactor. Check for physical damage or signs of arcing.
   Observe: Contactor is damaged or has visible signs of wear.
   Means: The contactor may be faulty and needs replacement.
   Next: Replace the contactor with a compatible part.
6. Check the Capacitor
   Do: Inspect the capacitor for bulging, leaking, or discoloration. Use a multimeter to test its capacitance.
   Observe: Capacitor is swollen, leaking, or shows low capacitance.
   Means: The capacitor is faulty and needs replacement.
   Next: Replace the capacitor with a new one of the same specifications.
7. Examine Electrical Connections
   Do: Check all electrical connections for looseness, corrosion, or burning.
   Observe: Loose or corroded connections are found.
   Means: Poor electrical connections are preventing power from reaching the unit.
   Next: Tighten or replace any damaged connections.
8. Test the Emergency Shutdown Switch
   Do: Locate the emergency shutdown switch near the outdoor unit and ensure it is in the 'ON' position.
   Observe: Switch was accidentally turned off.
   Means: The unit was manually shut off.
   Next: Turn the switch to 'ON' and test the AC unit.

Common causes

Parts matching

When replacing parts for your Goodman AC unit, ensure compatibility with your specific model. Check the unit's serial number and consult the owner's manual for exact specifications.

• Match the circuit breaker amperage to the unit's requirements.
• Verify the contactor and capacitor specifications with the manufacturer's label on the unit.
• Use wire connectors rated for outdoor use if replacing electrical connections.
• Ensure the thermostat is compatible with your Goodman AC model.
• Purchase a capacitor with the same microfarad (µF) rating and voltage as the original.

If unsure about part compatibility, contact a licensed HVAC technician for assistance.

When to call a professional

• The circuit breaker continues to trip after replacement.
• You find extensive electrical damage or are unsure about wiring.
• The AC unit still does not power on after replacing the contactor and capacitor.
• There is a burning smell or smoke coming from the unit.
• You hear unusual noises like grinding or squealing when attempting to power on the unit.
• The unit's age exceeds 10–15 years and repeated repairs are needed.

FAQ

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