HVACopediaRheem · Heat pump
01 Long run time (compressor)
What the control is telling you
The compressor has run continuously for more than 18 hours in cooling mode. On a conventional thermostat L terminal this is reported as 1 flash.
Applies to: (-)PRL-JEC 2-stage 16 SEER heat pumps: RPRL/UPRL-024JEC, -036JEC, -048JEC, -060JEC
Likely causes
- Low refrigerant charge
- Substantial duct leakage
- Dirty indoor air filter
- Dirty outdoor coil
Test and repair steps
- Replace or clean the indoor air filter.
- Clean the outdoor coil.
- Check refrigerant charge using the unit charging chart (liquid pressure method) after 15-30 minutes of stable run; check subcooling (normal 9-12°F).
- Leak-check the system if undercharged; repair before recharging.
- Inspect ducts for major leakage and confirm the unit is not undersized for the load.
Settings for these units
- Outdoor unit clearances · Rheem/Ruud PRL-JEC heat pump (Comfort Control2 ICC)
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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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