Ruud U802VA050317MSA Error Code T117_F: Detect RPM Motor Failure (Transient)
What Does Code T117_F Mean?
Fault code T117_F on the Ruud U802VA is a transient fault indicating that the blower motor RPM was detected outside the expected range at some point. The IFC monitors the blower motor's actual speed and compares it to the commanded speed. When these values diverge significantly, the fault is logged.
The T (transient) prefix means this was an intermittent observation — the motor may have been running at the wrong speed briefly rather than continuously failing. On the U802VA, fault history is accessible through the Bluetooth contractor app, and a technician can review when this fault occurred in relation to other events.
The U802VA blower is an ECM (electronically commutated motor). These motors have an integrated control module that can degrade over time, causing intermittent speed regulation issues before eventually failing. Worn motor bearings create mechanical load that the motor controller compensates for less effectively as bearing wear progresses. A dirty blower wheel adds unbalanced load that can also cause speed instability. While the furnace may currently be operating, T117_F is often an early warning that the blower motor system needs attention before a complete failure occurs.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Blower motor speed instability | Most common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- Schedule a service call — a technician should inspect the blower motor and ECM module before the intermittent fault becomes a full motor failure
- A technician can use the Bluetooth contractor app to review fault history and live RPM data to assess motor condition
- If left unaddressed, RPM instability typically progresses to persistent A117_F or complete motor failure A061_F
✓ Verified against manufacturer service manual — March 2026