HVACopediaRheem · Furnace
d5 Card/hardware conflict (CARD-HRD CNFLCT)
What the control is telling you
Memory card data is for a different furnace series; network data used if valid. Standby only (level 1).
Applies to: RGPE/RGLE 2-stage 80+
Likely causes
- Memory card from another furnace series
Test and repair steps
- Check whether the original memory card is attached to the IFC or inserted in connector J15.
- If the IFC was replaced, break the original memory card off the old control and insert it in J15 of the new one.
- Warning: Never swap memory cards or controls between furnaces or from a condenser/air handler - wrong data can cut heating airflow and trip the main limit.
- If the original card is lost, order the correct replacement memory card for this model from ProStock and insert it in J15.
- Communicating systems confirm the model in the furnace user menu under Unit Info matches the rating label.
Settings for these units
Filter sizes as shipped, upflow (Table 19) · RGPE/RGLE
| Cabinet width | Input | Bottom filter | Side filter | Quantity |
|---|---|---|---|---|
| 17-1/2 in. | 50, 75 (000 Btu/h) | 15-3/4 x 25 in. | 15-3/4 x 25 in. | 1 |
| 21 in. | 75, 100 (000 Btu/h) | 19-1/4 x 25 in. | 15-3/4 x 25 in. | 1 |
| 24-1/2 in. | 125 (000 Btu/h) | 22-3/4 x 25 in. | 15-3/4 x 25 in. | 1 |
Use one filter location only - do not double-filter or filter the supply side.
21 in./100K: cut 3-1/2 in. off filter and frame for a side filter; 24-1/2 in./125K: cut 7 in.
Reduced clearance to combustibles (Fig. 3 and 4) · RGPE/RGLE
| Model size | Cabinet width (A) | Left side | Right side | Back | Top | Front | Vent |
|---|---|---|---|---|---|---|---|
| RGPE upflow/horizontal 05 | 17-1/2 in. | 0 in. | 3 in. (note 2) | 0 in. | 1 in. | 3 in. | 6 in. (note 3) |
| RGPE upflow/horizontal 07(A) | 17-1/2 in. | 0 in. | 3 in. (note 2) | 0 in. | 1 in. | 3 in. | 6 in. (note 3) |
| RGPE upflow/horizontal 07(B), 10 | 21 in. | 0 in. | 0 | 0 in. | 1 in. | 3 in. | 6 in. (note 3) |
| RGPE upflow/horizontal 12 | 24-1/2 in. | 0 in. | 0 | 0 in. | 1 in. | 3 in. | 6 in. (note 3) |
| RGLE downflow 07(A) | 17-1/2 in. | 0 in. | 3 in. (note 2) | 0 in. | 1 in. | 3 in. | 6 in. (note 3) |
| RGLE downflow 07(B), 10 | 21 in. | 0 in. | 0 | 0 in. | 1 in. | 3 in. | 6 in. (note 3) |
| RGLE downflow 12 | 24-1/2 in. | 0 in. | 0 | 0 in. | 1 in. | 3 in. | 6 in. (note 3) |
Note 2: right side may be 0 in. with type B vent.
Note 3: vent clearance may be 1 in. with type B vent.
Models that show this code
10 models in RGPE/RGLE
Other codes on the same units
- 68 No blower communication (NO BLWR COMM)
- 82 Supply air sensor fault (SA SENSOR FLT)
- 93 Internal control fault
- d1 No shared data (NO SHARED DATA)
- d4 Memory card invalid (MEM CARD INVALD)
- d6 Blower HP conflict (BLWR HP CNFLCT)
- d7 Blower manufacturer conflict (BLWR MFG CNFLCT)
- d8 Old shared data (OLD SHARED DATA)
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Source: RGPE/RGLE: Table 16 p.49 / Table 20; memory card rules p.38-39. 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.