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Rheem · Heat pump troubleshooting

Outdoor unit will not run

What is going on

Electrical checks for a heat pump that does not start.

Likely causes

  • Power off or loose connections
  • Blown fuse/tripped breaker
  • No thermostat call (Y1 LED off)
  • Lockout active
  • Anti-short-cycle delay
  • Defective transformer
  • HPC open
  • Comm wires reversed (comm LED solid)

Check in this order

  1. Warning: Disconnect all power before servicing.
  2. Is the 7-segment lit? If not, check R-C 24VAC and the 3A ICC fuse.
  3. Flashing mode letter = anti-short-cycle delay; wait or press TEST.
  4. Alternating L and a number = lockout; read fault history and fix cause.
  5. Y1 red LED off = no call: check thermostat and control wiring (24V) or comm wiring (communicating).
  6. Check line voltage at disconnect and ICC; check breaker/fuses.
  7. Comm systems solid comm LED means reversed comm wires or term/bus switch issue.

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, 18.3 Electrical Checks Flow Chart / 18.6 General Troubleshooting Chart, p.44, 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.