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Rheem · Heat pump

29 High pressure control (HPC) open

High severity Rheem/Ruud PRL-JEC heat pump (Comfort Control2 ICC)

What the control is telling you

The ICC sees the HPC open. HPC opens near 610 PSIG and closes near 420 PSIG (the General Troubleshooting Chart elsewhere says 450 PSIG - manual inconsistency). Reported as 2 flashes on the L terminal.

Applies to: (-)PRL-JEC 2-stage 16 SEER heat pumps: RPRL/UPRL-024JEC, -036JEC, -048JEC, -060JEC

Likely causes

  • Dirty outdoor coil (cooling)
  • Outdoor fan not running (cooling)
  • Dirty indoor coil or filter (heating)
  • Indoor blower not running (heating)
  • Liquid line restriction
  • Refrigerant overcharge
  • Non-condensables in system

Test and repair steps

  1. Cooling clean the outdoor coil, verify outdoor fan motor/blade/rotation, check for discharge air recirculation.
  2. Heating replace filter, check the indoor coil and blower operation and speed.
  3. Check for a restricted liquid line or filter drier.
  4. Check charge; recover if overcharged. If non-condensables are suspected, recover, evacuate to 500 microns and recharge.
  5. Check HPC wiring at the ICC HPC input.

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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.

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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.