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Rheem · Heat pump

d4 Memory card invalid for device

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

What the control is telling you

The data on the memory card in the control does not match the control/unit. Also shown if the card is missing (unit still runs).

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

Likely causes

  • Wrong memory card
  • Memory card missing

Test and repair steps

  1. Check the memory card matches this unit (ID tag on the tether).
  2. Check the card is present and seated.
  3. If missing/damaged, order a new memory card; never use one from another unit.

Settings for these units

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Source: Rheem (-)PRL-JEC Heat Pump Installation Instructions, 12.6 ICC Diagnostic Codes / 18.2 Replacement of Control Board, p.31, 43. 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.