Rheem R96VA0702317MSA Error Code 68: No Blower Communications
What Does Code 68 Mean?
The Rheem R96V is a communicating furnace: its Integrated Furnace Control (IFC) sends the variable-speed ECM blower digital speed commands over a data connection rather than a simple on/off signal. Code 68 (No Blower Communications) means that conversation has failed — the IFC can no longer reach the motor. Because the control cannot command any airflow, the furnace shuts down completely; no heating, cooling, or fan-only operation is possible until the link is restored.
When code 68 strikes during a heat call, the R96V fails safe: the gas valve closes and the flame goes out immediately, the indoor blower stops, and the induced-draft motor finishes its post-purge at the correct speed. After post-purge (or right away if there was no heat call), the furnace waits idle until the fault is cleared.
The most common cause is a loose, corroded, or disconnected connection in the harness between the IFC and the ECM motor, since that harness carries both the motor's line voltage and the communication signal — losing either one breaks the link. No line voltage reaching the motor, corrupted model data, or a motor that has failed internally are less common causes. Distinguish code 68 from code 61 (Blower Fault - Motor Cannot Run): code 61 means the motor itself cannot turn, while code 68 means the control simply cannot talk to it, even if the motor is otherwise capable of running. Diagnosing which is the case involves line-voltage wiring and control connections, so this is technician-only work.
What You'll Notice
- The furnace is dead in all modes — no heat, no cooling, no fan
- The dual 7-segment display on the R96V control shows 68
- During a heat call the burners light briefly then drop out with no blower ever starting
- You hear the inducer run its post-purge, but the indoor blower never comes on
- The problem may have started after recent service, a power event, or work near the blower wiring
Common Causes
How This Is Diagnosed
A technician starts with the most common and simplest cause: the wiring between the IFC and the ECM motor. With power off they check every connector and terminal in that harness for looseness, corrosion, or a partial disconnection, since this run carries both the motor's line voltage and its communication signal.
If the wiring is sound, they confirm line voltage is actually reaching the motor, inspect the Power Factor Correction choke and its connectors, and verify the model data is not corrupted before testing the motor itself. This description is informational: checking line-voltage connections and the ECM motor on a live gas appliance, and replacing the motor or control if needed, is work for a qualified HVAC technician, not a DIY repair.
When to Call a Professional
This code involves components that are not homeowner-serviceable, so have a licensed HVAC technician diagnose and repair it. Keep in mind:
- The furnace shows 68 and will not run in any mode
- The burners light briefly but the indoor blower never starts and the furnace shuts back down
- The code appeared after recent service, a power outage or surge, or work near the blower
- Cycling power does not clear the code, or it returns on the next call
- You can see blower wiring that looks loose, chafed, or disconnected but are not sure how it should land
Frequently Asked Questions
Does code 68 mean my blower motor is bad?
Not necessarily. Code 68 means the control board cannot communicate with the motor. Often the motor is fine and the real problem is a loose or damaged wiring connection or lost power to the motor. A failed motor is only one of several possible causes a technician will check.
Why does the whole furnace stop, not just heating?
The same ECM blower moves air for heating, cooling, and fan-only. Since the IFC cannot command that motor at all with code 68, it disables every mode until communication is restored — there is no way to move air safely otherwise.
Can I clear code 68 by resetting power?
Cycling power may momentarily clear the display, but if the cause is a loose connection, lost voltage, or a failed motor, the code returns on the next call. The underlying wiring or motor issue has to be found and repaired by a technician.
✓ Verified against manufacturer service manual — March 2026