HVACopedia

Rheem · Heat pump

2 flashes (L terminal) L-terminal fault output: High pressure control trip

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

What the control is telling you

Equivalent to code 29/L29. Shown on an L-terminal compatible conventional thermostat when the unit is wired 24VAC (non-communicating).

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

Likely causes

  • Dirty outdoor coil
  • Fan not running
  • Overcharge
  • Liquid line restriction

Test and repair steps

  1. Read the ICC 7-segment display.
  2. Follow code 29 checks.

Settings for these units

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.

Open the app

Source: Rheem (-)PRL-JEC Heat Pump Installation Instructions, 12.7 Conventional 24VAC Thermostat Control Wiring (L terminal output), p.31. 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.