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Rheem · Heat pump

03 Short cycling

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

What the control is telling you

The last four (4) compressor cycles each ran less than three (3) minutes. Reported as 3 flashes on the L terminal.

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

Likely causes

  • Loose or bad thermostat wiring (R, C, 1, 2)
  • Thermostat located too close to a supply register

Test and repair steps

  1. Check thermostat wire connections at R, C, 1 and 2 at thermostat, indoor and outdoor unit.
  2. Check the thermostat location - move it if it sits in the discharge air stream of a supply grille.
  3. Check for intermittent pressure control trips (codes 21/29) in fault history.
  4. Check charge and indoor airflow if pressure controls are tripping.

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Source: Rheem (-)PRL-JEC Heat Pump Installation Instructions, 12.6 ICC Diagnostic Codes, p.29. 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.