d3
Goodman Compressor Protection / Locked Rotor or Overcurrent Event Logged

Goodman communicating thermostat shows d3 and compressor operation is restricted

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Aging or failing compressor, Weak run capacitor (non-inverter models), High head pressure due to airflow issues, Faulty contactor causing voltage drop

How to Fix / Troubleshooting

Safety first: Turn off power at the breaker and disconnect. High voltage is present; do not perform live tests without training.

Steps to check (visual/basic):

  • 1. Inspect contactor: In the Goodman condenser, check the contactor for burnt or pitted contacts. Replace if severely worn (best done by a technician).
  • 2. Check capacitor: Look at the run capacitor. If the top is bulged or leaking oil, it should be replaced with the same µF and voltage rating.
  • 3. Clean condenser coil: Dirty coils increase compressor load; clean as described in other entries.

When to call a professional: If d3 recurs, a technician should measure compressor amperage, check voltage, and evaluate compressor health.

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Repair Difficulty

Hard 4/5

Required Part

Compressor run capacitor or contactor
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