HVACopediaRheem · Heat pump
80 Low airflow
What the control is telling you
The ICC detects that the indoor unit cannot provide the minimum airflow the outdoor unit needs.
Applies to: (-)PRL-JEC 2-stage 16 SEER heat pumps: RPRL/UPRL-024JEC, -036JEC, -048JEC, -060JEC
Likely causes
- Indoor air mover misapplied or wrong size for the outdoor unit
Test and repair steps
- Confirm the air handler/furnace model is a matched, properly sized communicating unit.
- Check for dirty filter, closed registers or restricted ducts.
- Replace the indoor unit with a properly sized one if misapplied.
Settings for these units
Outdoor unit clearances · Rheem/Ruud PRL-JEC heat pump (Comfort Control2 ICC)
| Location | Minimum |
|---|---|
| Above unit (fan discharge) | 60 in. [1524 mm] |
| Coil air inlets (3 sides) | 6 in. [152 mm] |
| Service access side | 24 in. [610 mm] |
| Between two units (grille sides aligned) | 12 in. total (6 in. per unit) |
Do not reduce the 60 in. discharge or 24 in. service clearances.
Inlet clearances under 6 in. reduce capacity and efficiency.
Models that show this code
4 models in Rheem/Ruud PRL-JEC heat pump (Comfort Control2 ICC)
Other codes on the same units
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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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