What It Means
Loss of communication between control board and ECM blower motor.
Rheem Furnace
Rheem Furnace Error Code 68
Troubleshooting guide for the Rheem Furnace system fault 68.
Possible Causes
- Disconnected blower control wiring.
- Loss of line voltage to motor.
- Failed ECM blower motor.
- Corrupted model data or board failure.
Not sure which one it is — or if it's none of these? Try ACLogics today.
Disclaimer: This information is for general reference. Error codes can vary by model and production year. Always refer to your machine's specific manual and the information printed on the unit itself.
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Full Diagnosis
No blower communication.
All Recorded Causes
Disconnected or poor wiring connection between furnace control and blower motor, no line voltage to motor, faulty/corrupted model data, failed ECM motor, or failed control/motor communication circuit.
Verify Before Replacing Parts
- Confirm the exact Rheem model family and furnaces context before acting on a generic code description.
- Confirm board LEDs, wiring polarity, and model compatibility before replacing control boards — this Rheem fault points at disconnected or poor wiring connection between furnace control and blower motor, no line v….
- Check for intermittent communication faults caused by connectors, moisture, or damaged harnesses, and rule out the next candidate on the list.
- After the correction, run the system long enough to confirm the furnaces fault does not return under normal load.
Still unsure about this fault?
ACLogics walks you through Rheem Furnace diagnostics step-by-step — so you confirm the cause before swapping parts.
