Rheem Error Code CFM LED blinks: CFM LED blink count = target airflow (Furnace)
Rheem error code CFM LED blinks on a furnace means: CFM LED blink count = target airflow. It is also called Rheem diagnostic code CFM LED blinks.
Homeowner? What Rheem code CFM LED blinks means for you
Usually minor Your furnace is reporting: CFM LED blink count = target airflow. This code is usually informational or minor. The safe checks below often clear it; call us if it keeps showing up.
Safe things you can check yourself
- Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
- Make sure the unit has power: its on/off switch (often looks like a light switch near the unit) is ON and the breaker in the electrical panel is not tripped.
- Make sure the furnace front door or panel is closed properly; many furnaces will not run with the door switch open.
- Look at the air filter. If it is grey and clogged, replace it; a blocked filter causes many shutdowns.
- Outside, make sure the intake and exhaust pipes or vent cap are not blocked by snow, ice, leaves or a nest.
- Check that the gas valve next to the furnace is open (handle in line with the pipe). Do not force it.
- Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.
Call (647) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does Rheem error code CFM LED blinks mean?
The CFM LED on the RGRM/RGTM control reports the blower's target airflow by blinking. One full blink is 100 CFM and a half blink is about 50 CFM, followed by a pause of about one second before the count repeats. Example: eleven and a half blinks means roughly 1150 CFM. It is a target value and only a rough guide, not a measurement.
Applies to: Rheem RGRM/RGTM 90 Plus furnaces
Rheem models that use code CFM LED blinks
RGRM-04RGRM-06RGRM-07RGRM-09RGRM-10RGRM-12RGTM-06RGTM-07RGTM-09RGTM-10
Other Rheem Furnace codes
All Rheem Furnace error codes →
Rheem code CFM LED blinks: homeowner questions
What does Rheem code CFM LED blinks mean?
CFM LED blink count = target airflow. The CFM LED on the RGRM/RGTM control reports the blower's target airflow by blinking. One full blink is 100 CFM and a half blink is about 50 CFM, followed by a pause of about one second before the count repeats. Example: eleven and a half…
Is it safe to keep using my furnace with code CFM LED blinks?
Usually yes. Code CFM LED blinks is normally minor, but if it keeps coming back have it checked.
Can I reset Rheem code CFM LED blinks myself?
You can try one reset (power off for 30 seconds, then on). If Rheem code CFM LED blinks comes back, the cause is still there and a licensed technician should check it.
Who can fix Rheem code CFM LED blinks near me?
Aurora Star Tech Inc. repairs Rheem furnaces in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.
Homeowner help: Furnace Not Turning On: What to Check · Furnace Blinking Light: What the Flash Codes Mean
Troubleshooting guides
- Blowing cold air All brands · Furnace
- No heat All brands · Furnace
- Short cycling All brands · Furnace
- Blower codes 66, 61 and 60 - what to look for Rheem · Furnace
- Blower does not start after burners light Rheem · Furnace
- Burners go out before the heat call ends / short cycling Rheem · Furnace
- Clear the fault history Rheem · Furnace
- Clearing lockouts Rheem · Furnace
- Codes look upside down - display orientation switch S1-1 Rheem · Furnace
- Communicating system not found / no communication Rheem · Furnace
- ECM blower does not start on heat Rheem · Furnace
- ECM blower will not run - power and communication checks (code 68) Rheem · Furnace
- Extended display mode Rheem · Furnace
- Force low or high fire for testing (RGPE/RGLE) 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
- Heat call troubleshooting walk-through (two-stage communicating IFC) 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
- Pushbutton status menu: fault history, CFM, fire rate, unit size, temperature rise Rheem · Furnace
- Read or clear the six-fault history from the thermostat (RGPE/RGLE) Rheem · Furnace
- Read target airflow from the CFM LED Rheem · Furnace
- Replacing the furnace control: keep the memory card and copy the dipswitches Rheem · Furnace
- Replay or clear the fault history on power-up (802P / 80MDP / R95P) Rheem · Furnace
- Replay or clear the last five faults (RGPE/RGLE) Rheem · Furnace
- Reset a soft lockout (R95P) Rheem · Furnace
- Single-stage thermostat on a two-stage furnace: auto staging Rheem · Furnace
- Test communication with the LEARN button (RGPE/RGLE) Rheem · Furnace
- Thermostat does not hold room temperature Rheem · Furnace
Source: Rheem RGRM Installation Instructions (Nature Air), Flame, Status, Power and CFM LED descriptions, p.53. Written in our own words as a summary; always check the original manual.
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.