HVACopediaRheem · Heat pump
28 High line voltage
What the control is telling you
The ICC detects line voltage above the allowed range.
Applies to: (-)PRL-JEC 2-stage 16 SEER heat pumps: RPRL/UPRL-024JEC, -036JEC, -048JEC, -060JEC
Likely causes
- Utility supply voltage high
- Wrong unit voltage for the supply
Test and repair steps
- Measure line voltage at the unit; it must not exceed 253V on 208/230V units.
- Confirm the unit nameplate voltage matches the supply.
- Have the power company correct high supply voltage.
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.30. Summarized in our own words; check the original manual for your model.
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