HVACopediaRheem · Heat pump troubleshooting
Outdoor fan runs but compressor does not
What is going on
Compressor fails to start while the outdoor fan runs.
Likely causes
- Bad run or start capacitor
- Bad start relay
- Loose connection
- Compressor stuck, grounded, open winding or open internal overload
- Low voltage
Check in this order
- Check run/start capacitors and the start relay; replace faulty parts.
- Check voltage at the compressor and tighten connections.
- If the internal overload is open, wait at least 2 hours for it to reset before condemning the compressor.
- Check winding resistance and to ground.
- Low voltage correct supply; start kit components are factory installed.
Applies to: (-)PRL-JEC 2-stage 16 SEER heat pumps: RPRL/UPRL-024JEC, -036JEC, -048JEC, -060JEC
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Source: Rheem (-)PRL-JEC Heat Pump Installation Instructions, 18.6 General Troubleshooting Chart, p.47. Written in our own words; check the manual for your exact model.
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.