Rheem RGRM-12 Error Codes
Rheem RGRM-12 error codes and diagnostic codes (also listed as RGRM-12*RAJS). The RGRM-12 is a Rheem furnace in the Rheem RGRM/RGTM 90 Plus series.
Rheem RGRM-12 error codes list
| Code | Meaning | Severity |
|---|---|---|
| 6 blinks | Line and neutral reversed | Medium |
Troubleshooting the RGRM-12
- Blowing cold air All brands · Furnace
- No heat All brands · Furnace
- Short cycling All brands · Furnace
- Blower does not start after burners light Rheem · Furnace
- Burners go out before the heat call ends / short cycling Rheem · Furnace
- Communicating system not found / no communication Rheem · Furnace
- ECM blower does not start on heat Rheem · Furnace
- Furnace no heat - sequence troubleshooting Rheem · Furnace
- Furnace short cycles or does not hold setpoint Rheem · Furnace
- Gas valve does not shut off when heat call ends Rheem · Furnace
- Indoor blower does not start after burners light Rheem · Furnace
- Inducer (draft motor) does not start on heat call Rheem · Furnace
- Inducer does not run / does not run on low speed Rheem · Furnace
- Inducer runs 60 s then shuts off for 5 minutes, or runs continuously Rheem · Furnace
- Inducer runs 60 seconds then off for 5 minutes Rheem · Furnace
- No heat - inducer (IDM) does not start Rheem · Furnace
- No heat - POWER LED off Rheem · Furnace
- Read target airflow from the CFM LED Rheem · Furnace
- Thermostat does not hold room temperature Rheem · Furnace
Rheem RGRM-12 specs and setup data
- Filter sizes Rheem · Furnace · Rheem RGRM/RGTM 90 Plus
All Rheem Furnace error codes →
Homeowner help: Furnace Not Turning On: What to Check · Furnace Blinking Light: What the Flash Codes Mean
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.