HVACopediaRheem · Heat pump
84 Outdoor ambient temperature sensor fault
What the control is telling you
The ambient sensor reads an abnormally low or high outdoor temperature. With a failed ambient sensor, the control defrosts every 34 minutes in heat mode with coil below 35°F.
Applies to: (-)PRL-JEC 2-stage 16 SEER heat pumps: RPRL/UPRL-024JEC, -036JEC, -048JEC, -060JEC
Likely causes
- Failed ambient sensor
- Unit in an unusually hot location
Test and repair steps
- If the outdoor unit is in a high-temperature area, wait until the ambient drops and recheck the sensor reading.
- Check sensor installation and connector at the ICC.
- Replace the sensor.
Settings for these units
- Outdoor unit clearances · Rheem/Ruud PRL-JEC heat pump (Comfort Control2 ICC)
Save it for the next call
Star this code in the HVACopedia app and keep the whole library on your phone for jobs with no signal.
Source: Rheem (-)PRL-JEC Heat Pump Installation Instructions, 12.6 ICC Diagnostic Codes, p.30. Summarized in our own words; check the original manual for your model.
Homeowner looking at this code? See what it means for you and when to call a technician.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.