HVACopediaRheem furnace error codes
40 codes with causes and test steps, plus 9 settings tables.
| Code | Meaning | Severity |
|---|---|---|
| 1 blink | Soft lockout (failed ignition) | High |
| 2 blinks | Pressure switch circuit open | Medium |
| 3 blinks | Limit circuit open | High |
| 4 blinks | Pressure switch circuit closed (stuck closed) | Medium |
| 5 blinks | Twinning fault (optional) | Low |
| 6 blinks | Line and neutral reversed | Medium |
| 10 | One-hour lockout | High |
| 11 | Failed ignition | High |
| 12 | Low flame sense | Medium |
| 13 | Flame lost | High |
| 14 | Unexpected flame | Critical |
| 20 | Twinning fault | Medium |
| 22 | Main limit open | High |
| 23 | HALC limit open (HALC LIMIT OPEN) | High |
| 26 | Line and neutral reversed | High |
| 33 | Rollout switch (MRLC) open | Critical |
| 44 | Low pressure switch closed (stuck) | High |
| 45 | Low pressure switch open - inducer high speed | High |
| 46 | Low pressure switch open - inducer low speed | High |
| 55 | Pressure switch stuck closed | High |
| 57 | Pressure switch stuck open | High |
| 58 | Water sense circuit open | Medium |
| 59 | Water sensed / blocked drain | High |
| 60 | Blower fault - running (BLWR FLT-RUN) | Medium |
| 61 | Blower fault - blower not running | Critical |
| 66 | Blower overspeed (BLOWER OVRSPEED) | Medium |
| 68 | No blower communication (NO BLWR COMM) | Critical |
| 82 | Supply air sensor fault (SA SENSOR FLT) | Low |
| 93 | Internal control fault | Critical |
| d1 | No shared data (NO SHARED DATA) | Critical |
| d4 | Memory card invalid (MEM CARD INVALD) | Medium |
| d5 | Card/hardware conflict (CARD-HRD CNFLCT) | Medium |
| d6 | Blower HP conflict (BLWR HP CNFLCT) | High |
| d7 | Blower manufacturer conflict (BLWR MFG CNFLCT) | High |
| d8 | Old shared data (OLD SHARED DATA) | Medium |
| Flame LED off | No flame sensed (troubleshooting aid) | Medium |
| Flame LED rapid blink | Amber flame LED - unexpected flame | Critical |
| Flame LED slow blink | Amber flame LED - marginal flame sense | Medium |
| h flashing | Calibrating (CALIBRATE-NO V) | Low |
| r | Lockout indicator | High |
Settings and specs
Filter sizes
Filters · Rheem RGRM/RGTM 90 Plus
| Cabinet width | Input (MBTUH) | Bottom | Side | Qty |
|---|---|---|---|---|
| 17-1/2 in. upflow | 45, 60, 75A | 15-3/4 x 25 | 15-3/4 x 25 | 1 |
| 21 in. upflow | 75B, 90, 105 | 19-1/4 x 25 | 15-3/4 x 25 | 1 |
| 24-1/2 in. upflow | 120 | 22-3/4 x 25 | 15-3/4 x 25 | 1 |
| 17-1/2 in. downflow/horiz. | 60, 75A | 12 x 20 | - | 2 |
| 21 in. downflow/horiz. | 75B, 90, 105 | 12 x 20 | - | 2 |
| 24-1/2 in. downflow/horiz. | 120 | 14 x 20 | - | 2 |
- Use both side returns for 1800 CFM or more.
- Some side filters must be trimmed to fit (21 in. cabinets: remove a 3.5 in. strip; 24.5 in.: a 7 in. strip).
- Do not double-filter the return.
Source: Rheem RGRM/RGTM Installation Instructions 92-24161-84-01, Table 14 p.50; Filters p.50
Filter sizes (Table 12)
Filters · Rheem 90RJ/90TJ 90 Plus
| Configuration | Cabinet width | Input (MBTU/h) | Bottom filter | Side filter | Qty |
|---|---|---|---|---|---|
| Upflow | 17-1/2 in. | 45, 60, 75 | 15-3/4 x 25 in. | 15-3/4 x 25 in. | 1 |
| Upflow | 21 in. | 90, 105 | 19-1/4 x 25 in. | 15-3/4 x 25 in. | 1 |
| Upflow | 24-1/2 in. | 120 | 22-3/4 x 25 in. | 15-3/4 x 25 in. | 1 |
| Downflow | 17-1/2 in. | 45, 60, 75 | 12 x 20 in. | - | 2 |
| Downflow | 21 in. | 90, 105 | 12 x 20 in. | - | 2 |
| Downflow | 24-1/2 in. | 120 | 14 x 20 in. | - | 2 |
- Filters are not factory-installed; they must be field supplied.
- Side filter on 21 in. units: cut 3.5 in. off the filter and frame; on 24.5 in. units cut 7 in.
Source: Rheem 90RJ/90TJ installation instructions 92-24161-32-08, Table 12 Filter Sizes, PDF p.51
Minimum clearance to combustibles
Clearances · Rheem 90RJ/90TJ 90 Plus
| Configuration | Left side | Right side | Back | Top | Front | Vent |
|---|---|---|---|---|---|---|
| Upflow | 0 in. | 0 in. | 0 in. | 1 in. | 2 in. (24 in. service) | 0 in. |
| Downflow | 0 in. | 0 in. | 0 in. | 1 in. | 2 in. (24 in. service) | 0 in. |
| Horizontal | 0 in. | 0 in. | 0 in. | 1 in. | 2 in. (24 in. service) | 0 in. |
- Same values for every cabinet size.
- 24 in. service clearance recommended in front of all furnaces.
- Not approved for installation on its back (doors facing up).
Source: Rheem 90RJ/90TJ installation instructions 92-24161-32-08, Figures 5-7 Clearance to Combustibles, PDF p.9-11
Filter sizes (Table 9)
Filters · Rheem (-)GRC/(-)GTC 90 Plus
| Configuration | Cabinet width | Input (MBTU/h) | Bottom filter | Side filter | Qty |
|---|---|---|---|---|---|
| Upflow | 17-1/2 in. | 45, 60, 75 | 15-3/4 x 25 in. | 15-3/4 x 25 in. | 1 |
| Upflow | 21 in. | 90, 105 | 19-1/4 x 25 in. | 15-3/4 x 25 in. | 1 |
| Downflow | 17-1/2 in. | 45, 60, 75 | 12 x 20 in. | - | 2 |
| Downflow | 21 in. | 90 | 12 x 20 in. | - | 2 |
| Downflow | 24-1/2 in. | 105 | 14 x 20 in. | - | 2 |
- Side filter on 21 in. units: cut 3.5 in. off the filter and frame; on 24.5 in. units cut 7 in.
- Do not run the system for long periods without filters.
Source: Rheem (-)GRC/(-)GTC installation instructions 92-24161-88-00, Table 9 Filter Sizes, PDF p.54
Minimum clearance to combustibles
Clearances · Rheem (-)GRC/(-)GTC 90 Plus
| Configuration | Left side | Right side | Back | Top | Front | Vent |
|---|---|---|---|---|---|---|
| Upflow | 0 in. | 0 in. | 0 in. | 1 in. | 2 in. (24 in. service) | 0 in. |
| Downflow | 0 in. | 0 in. | 0 in. | 1 in. | 2 in. (24 in. service) | 0 in. |
| Horizontal | 0 in. | 0 in. | 0 in. | 1 in. | 2 in. (24 in. service) | 0 in. |
- Same values for every cabinet size.
- 24 in. service clearance recommended in front of all furnaces.
- Not approved for installation on its back (doors facing up).
Source: Rheem (-)GRC/(-)GTC installation instructions 92-24161-88-00, Figures 6-8 Clearance to Combustibles, PDF p.13-15
Clearance to combustibles (all models)
Clearances · R95P
| Location | Minimum clearance |
|---|---|
| Left side | 0 in. |
| Right side | 0 in. |
| Back | 0 in. |
| Top | 1 in. |
| Front | 2 in. |
| Vent | 0 in. |
| Service (front) | 24 in. recommended |
- Same values for R95PA040 through 115.
- Column order read from a rotated drawing header - confirm on the furnace clearance label.
- Downflow non-zero-clearance installs need the right-side vent clearance in Figure 4, otherwise use kit RXGY-ZK.
Source: Rheem (-)95P Series single-stage condensing furnace Installation Instructions 92-24161-111-03, Figure 6 Unit Dimensions (Clearance to Combustibles), p.14-15
Filter sizes as shipped, upflow (Table 19)
Filters · 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.
- Some filters must be ordered or cut to fit.
- High-efficiency filters add resistance - check airflow if you change filter type.
- Side return: use both sides at 1800 CFM or more.
Source: Rheem RGPE/RGLE 2-stage 80+ communicating furnace Installation Instructions 92-24161-77-02, Table 19 Filter Sizes, p.60 (printed)
Reduced clearance to combustibles, upflow/horizontal (Fig. 4)
Clearances · 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.
- Values are inches from the furnace casing to combustible material.
Source: Rheem (-)802P/(-)(-)80MDP installation instructions 92-24161-146-02, Figure 4 Upflow/Horizontal Dimensions - Clearance to Combustible Material, p.10 (manual page; PDF p.13)
Reduced clearance to combustibles (Fig. 3 and 4)
Clearances · 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.
- Downflow on a combustible floor needs the combustible floor base unless the furnace sits on a coil box.
- Do not install the upflow/horizontal furnace on its back with the access doors facing up.
- Values are inches from the casing to combustible material.
Source: Rheem RGPE/RGLE 2-stage 80+ communicating furnace Installation Instructions 92-24161-77-02, Figure 3 Upflow/Horizontal Dimensions and Figure 4 Downflow Dimensions - Clearance to Combustible Material, p.8-9 (printed; PDF p.12-13)
Models covered
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.