HVAC Cheat Sheethvaccheatsheet.com/charts/furnace-codes/rheem-r96v
Rheem / Ruud R96V / 96MDV Furnace Codes
Sold as Rheem R96V and Ruud U96V / 96MDV. Other Rheem and Ruud communicating furnaces use similar two-digit codes, but check the label on the unit.
| Code | Meaning | What to check |
|---|---|---|
| d1 | No model data. | Memory card missing or not seated. Use the card that came with the furnace. |
| d4 | No valid model data on memory card. | Wrong or damaged memory card. |
| d6 | Horsepower conflict on memory card. | Blower motor horsepower doesn't match the model data, usually after a motor replacement. |
| 10 | One-hour lockout. | Shown alternating with the code that caused it (11, 13, 14, 59, 61). Fix that fault. How to fix → |
| 11 | Failed ignition. | Gas supply, igniter, gas valve, flame sensor. How to fix → |
| 12 | Low flame sense. | Clean the flame sensor, check wiring and burner ground. How to fix → |
| 13 | Flame lost after established. | Flame sensor, gas pressure, ground, unstable flame. How to fix → |
| 14 | Flame present with gas valve off. | Miswired gas valve, valve stuck open, or control fault. How to fix → |
| 22 | Main limit open. | Airflow: filter, blower, ducts, coil. Check temperature rise. How to fix → |
| 23 | HALC open. | No continuity between pins 3 and 5 of connector P1 on the control. Repair the jumper or wiring. |
| 26 | Line and neutral reversed or poor ground. | Swap hot and neutral; verify a solid ground. How to fix → |
| 30 | Open fuse. | Short in 24 VAC wiring to ground or common. How to fix → |
| 33 | Over-temperature switch (roll-out) open. | Venting, inducer, heat exchanger, flame pattern. Manual reset. How to fix → |
| 44 | Low pressure switch closed, inducer off. | Stuck or bypassed switch, or abnormal vent pressure. How to fix → |
| 45 | Low pressure switch open, inducer on high speed. | Vent or intake blockage, excess vent length, hoses, inducer. How to fix → |
| 46 | Low pressure switch open, inducer on low speed. | Vent or intake blockage, hoses, inducer, high-altitude kit. How to fix → |
| 55 | High pressure switch closed, inducer off. | Stuck or bypassed switch. How to fix → |
| 57 | High pressure switch open, inducer on high speed. | Vent or intake blockage, hoses, inducer. How to fix → |
| 58 | Water circuit open. | Blocked-drain (water) sensor wiring open or disconnected. |
| 59 | Water sensed. | Blocked condensate drain or trap; clear it and check the sensor. |
| 60 | Blower fault – blower can still run. | High static pressure or restrictive ducts. How to fix → |
| 61 | Blower fault – motor cannot run. | Motor wiring, choke, failed motor or seized wheel. |
| 66 | Blower cutback. | Blower at its torque or speed limit: high static pressure. How to fix → |
| 68 | No blower communications. | Communication wiring between control and motor, or failed motor. |
| 93 | Internal control fault detected. | Check for 24 VAC applied where it shouldn't be; otherwise replace the control. |
| 99 | Remote faults reset performed. | Informational: the fault history was cleared. |
How to read the codes
- The two-digit fault code shows on the seven-segment display on the control. Communicating thermostats also show the code and a message.
- Some codes alternate: for example 10 (one-hour lockout) alternating with 11 means four failed ignitions in a row.
- Codes 'd1', 'd4' and 'd6' relate to the plug-in model data (memory) card.
Codes point to a circuit, not a part. Test before replacing anything, and never jumper a limit, rollout or pressure switch to keep a furnace running. Gas and line-voltage work is for trained technicians.
Source: Rheem R96V / 96MDV Installation Instructions, 92-24161-124-08, Table 20 Fault Codes. The "meaning" column follows the manufacturer's wording; "what to check" is our field summary. Always go by the label on the furnace you're working on.
Related
- How to read furnace LED flash codes
- Furnace pressure switch troubleshooting
- Flame sensor microamps and cleaning
Other brands
- Lennox Merit ML180UH (80% single-stage)
- Carrier 58CVA / 58CVX (80% variable-speed two-stage)
- Goodman / Amana GR9S80 / GD9S80 (80% single-stage)
- Trane / American Standard S9X1 / S9X2 / S9B1 (96% condensing)
- Lennox SL280UHV (80% two-stage variable speed)
- Goodman / Amana / Daikin GM9S96 / GC9S96 / GM9S92 (96% and 92% condensing, single-stage)
- Carrier 59TP6C two-stage condensing with InteliSense (Performance series)
One field tip a week
A short, practical HVAC tip in your inbox every week: diagnostics, charging, airflow and code changes. Free, unsubscribe anytime.
We'll only use your email for the newsletter. Privacy policy.
HVAC Cheat Sheet · Free PT charts, code lookups and calculators for techs at hvaccheatsheet.com