What It Means
Temperature sensor fault due to open, shorted, disconnected, or out-of-range condition.
Goodman All Systems
Goodman Error Code A3
Troubleshooting guide for the Goodman system fault A3.
Possible Causes
- Shorted temperature sensor.
- Open temperature sensor.
- Disconnected temperature sensor.
- Temperature sensor out of range.
Not sure which one it is — or if it's none of these? Try ACLogics today.
Disclaimer: This information is for general reference. Error codes can vary by model and production year. Always refer to your machine's specific manual and the information printed on the unit itself.
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Full Diagnosis
Shorted sensor./Open sensor./Sensor disconnected./Sensor out of range.
All Recorded Causes
Verify Before Replacing Parts
- Confirm the exact Goodman model family and default context before acting on a generic code description.
- Verify the sensor or thermistor reading against the expected range for the current operating condition, keeping in mind that the most likely cause listed above.
- Check the sensor harness and board connection before condemning the sensor itself; on Goodman units this is also where you'd confirm the next candidate on the list.
- After the correction, run the system long enough to confirm the default fault does not return under normal load.
Not sure which system this Goodman code is on?
ACLogics has guided diagnostics for 20 Goodman fault codes and asks the right questions to narrow it down.
