Rheem Furnace Codes: Manual-Based Code Table
If you smell gas or a CO alarm sounds, leave the home and call the gas utility or 911 from outside.
Rheem furnace codes must be matched to the furnace model and control family. This table quotes the manufacturer manual for (-)801T upflow/horizontal and (-)(-)80MSX. Record the exact display or flash count before requesting service, then use the linked code page for the documented meaning and source.
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HVAC Responder Editorial Team · Reviewed 2026-11-01 · Facts quoted from manufacturer documentation
Covered manual and furnace series
(-)801T upflow/horizontal and (-)(-)80MSX; 92-24161-144-09
Coverage is limited to the named manual. Other controls can assign different meanings to the same signal.
Ruud model matching
The source uses the model prefixes (-)801T and (-)(-)80MSX. Match the complete model and control before applying these definitions to Ruud equipment.
Rheem furnace code table
| Code | Meaning |
|---|---|
| Rheem Furnace Code 10 | One-hour lockout |
| Rheem Furnace Code 11 | Failed ignition |
| Rheem Furnace Code 12 | Low flame sense |
| Rheem Furnace Code 13 | Flame lost |
| Rheem Furnace Code 14 | Unexpected flame |
| Rheem Furnace Code 20 | Twinning fault |
| Rheem Furnace Code 22 | Main limit or HALC open |
| Rheem Furnace Code 26 | Line and neutral reversed |
| Rheem Furnace Code 33 | Manual-reset rollout limit open |
| Rheem Furnace Code 55 | Pressure switch stuck closed |
| Rheem Furnace Code 57 | Pressure switch stuck open |
| Rheem Furnace Code 61 | Blower unable to run |
| Rheem Furnace Code 93 | Internal control fault |
Discuss your Rheem furnace codes with a contractor
Call (877) 565-3062One call reaches a contractor registered for your ZIP; ask the fee and the arrival window.
What happens when you call about your Rheem furnace codes
- Your call routes to an independent local contractor registered for your ZIP code.
- Ask the fee and the arrival window.
- The decision to hire stays with you.
One call reaches a contractor registered for your ZIP; ask the fee and the arrival window.
Sources and review date
- Rheem (-)801T installation instructions (92-24161-144-09), PDF · Read 2026-11-01
- CPSC Carbon Monoxide Fact Sheet · Read 2026-11-01