What It Means
Outdoor ambient temperature sensor fault.
Rheem AC & Heat Pump
Rheem AC & Heat Pump Error Code 84
Troubleshooting guide for the Rheem AC & Heat Pump system fault 84.
Possible Causes
- Ambient sensor out of range.
- Improper sensor placement.
- Loose or damaged wiring.
- Failed ambient thermistor.
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
Outdoor ambient temperature fault.
All Recorded Causes
Ambient sensor detects abnormally low or high outdoor temperature, sensor out of range, bad sensor placement, loose/damaged wiring, or failed sensor.
Verify Before Replacing Parts
- Confirm the exact Rheem model family and ac and heat pump 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 ambient sensor detects abnormally low or high outdoor temperature, sensor out of range, ba….
- Check the sensor harness and board connection before condemning the sensor itself; on Rheem 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 ac and heat pump fault does not return under normal load.
Not sure which system this Rheem code is on?
ACLogics has guided diagnostics for 57 Rheem fault codes and asks the right questions to narrow it down.
