HVACopediaRheem · Furnace
h (lowercase) Low-fire gas heat on
What the display is showing
A lowercase h on the display means the furnace is running its low gas heat stage. On RGPE/RGLE the troubleshooting chart accepts either H or h as normal while a 24 V thermostat calls for heat. A flashing h on RGPE/RGLE is a different thing (calibration, listed separately).
Applies to: Rheem/Ruud (-)802P / 80MDP 80% two-stage furnaces; Rheem/Ruud RGPE / RGLE modulating furnaces
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, upflow/horizontal (Fig. 4) · Rheem/Ruud 802P / 80MDP 80% two-stage furnace (UT 1028-928 IFC)
| Model size | Cabinet width (A) | Left side | Right side | Back | Top | Front | Vent |
|---|---|---|---|---|---|---|---|
| 050 (5) | 14 in. | 0 in. | 4 in. (note 2) | 0 in. | 1 in. | 3 in. | 6 in. (note 3) |
| 075 (7) | 17-1/2 in. | 0 in. | 3 in. (note 2) | 0 in. | 1 in. | 3 in. | 6 in. (note 3) |
| 100 (10) | 21 in. | 0 in. | 0 | 0 in. | 1 in. | 3 in. | 6 in. (note 3) |
| 125 (12) | 24-1/2 in. | 0 in. | 0 | 0 in. | 1 in. | 3 in. | 6 in. (note 3) |
| 150 (15) | 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.
- Reduced clearance to combustibles (Fig. 3 and 4) · RGPE/RGLE
Models that show this code
27 models in Rheem/Ruud 802P / 80MDP 80% two-stage furnace (UT 1028-928 IFC), RGPE/RGLE, R96V/96MDV
Other codes on the same units
- Top and bottom bars (right digit) Fault history cleared confirmation
- UI Unit input readout (pushbutton status menu)
- UNIT INFO menu Furnace user menu - UNIT INFO
- cd / Cd Dehumidification cooling
- dF Defrost in progress (dual fuel)
- h flashing Calibrating (CALIBRATE-NO V)
- r Lockout indicator
- tr Temperature rise readout (pushbutton status menu)
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Source: Rheem (-)802PA Installation Instructions, Diagnostics and Fault Codes (UT 1028-928 control), pp.40-41; RGPE Troubleshooting chart (Figure 45, p.64). Summarized in our own words; check the original manual for your model.
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.