Goodman AC Unit Will Not Turn On Causes

Quick answer

If your Goodman AC won't turn on, first check the power supply, thermostat settings, and circuit breaker. A tripped breaker or faulty thermostat is often the cause. Reset the breaker and ensure the thermostat is set correctly.

Confirm the symptom

• AC does not power on at all
• No fan or compressor noise when turning on
• Thermostat shows no response or error code

Tools and prep

• Voltage tester
• Screwdriver set
• Replacement fuses or circuit breaker (if needed)
• Owner's manual for your Goodman AC unit
• Safety gloves and goggles
• Flashlight for visibility in electrical panels

Step-by-step troubleshooting

1. Check Power Supply
   Do: Verify the AC unit is receiving power from the electrical panel.
   Observe: Confirm the circuit breaker is in the 'ON' position and not tripped.
   Means: The unit has no power due to a tripped breaker or blown fuse.
   Next: Reset the breaker or replace the fuse if necessary.
2. Inspect Thermostat
   Do: Check the thermostat settings and battery.
   Observe: Ensure the thermostat is set to 'COOL' and the temperature is lower than room temperature. Replace batteries if low.
   Means: Incorrect settings or dead batteries prevent the AC from starting.
   Next: If the thermostat is functioning, move to the next step.
3. Test Emergency Switch
   Do: Locate and check the emergency shutoff switch near the outdoor unit.
   Observe: The switch may be in the 'OFF' position or tripped.
   Means: The emergency switch is manually turned off or tripped due to an overload.
   Next: Turn the switch back to 'ON' and attempt to restart the AC.
4. Examine Contactor Relay
   Do: Inspect the contactor relay inside the outdoor unit's electrical panel.
   Observe: The relay may be burnt, stuck, or not engaging when the thermostat calls for cooling.
   Means: A faulty contactor relay prevents power from reaching the compressor.
   Next: Replace the contactor relay if it's damaged or not functioning.
5. Check Capacitor
   Do: Look at the capacitor in the outdoor unit for signs of damage or bulging.
   Observe: A swollen or leaking capacitor indicates failure.
   Means: A bad capacitor can prevent the motor from starting.
   Next: Replace the capacitor with a compatible model.
6. Test Motor and Compressor
   Do: Use a voltage tester to check for power at the motor and compressor terminals.
   Observe: If power is present but the motor/compressor does not run, there may be an internal failure.
   Means: A failed motor or compressor requires professional diagnosis.
   Next: Contact a licensed HVAC technician for further inspection.

Common causes

Parts matching

Common parts needed for Goodman AC units include:

• Circuit breaker (amp rating matching unit specs)
• Thermostat batteries (typically AA or CR2032)
• Contactor relay (model-specific to your Goodman unit)
• Capacitor (with matching voltage and microfarad rating)
• Owner's manual for part specifications

Always refer to your Goodman AC unit's owner's manual for exact part specifications and compatibility.

When to call a professional

• If the unit still doesn't turn on after checking all basic components
• If you suspect internal motor or compressor failure
• If you're unsure about handling electrical components
• If error codes persist after troubleshooting
• If the unit is under warranty and you don't want to risk voiding it

FAQ

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