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Rheem · Heat pump

30 ICC fuse open

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

What the control is telling you

The 3-amp low-voltage fuse on the ICC is blown.

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

Likely causes

  • Shorted, damaged or miswired low voltage wiring at R and C

Test and repair steps

  1. Warning: Turn power off before working on the control.
  2. Find and fix the short in the R/C wiring (check for nicked thermostat wire, wires touching the cabinet).
  3. Replace only with a 3A automotive ATC-style blade fuse.
  4. Restore power and confirm 24VAC at R-C.

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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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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.