York TM9V080B12MP11 Error Code 11 Red Flashes: Limit Circuit Open 5-15 Minutes
What Does Code 11 Red Flashes Mean?
An 11 red flash code on the York TM9V080B12MP11 indicates the limit circuit has remained open for more than five minutes but less than fifteen minutes. The control board uses this time window to distinguish between a simple airflow restriction (which would resolve as the furnace cools) and a more serious blower failure. At the 5-minute mark, the board concludes that the blower is likely not functioning and enters a hard lockout.
A failed blower motor is the most common cause. The variable-speed ECM motor in this furnace can fail due to burned windings, a seized bearing, or a failed electronic module within the motor housing. A damaged or detached blower wheel — the fan assembly that moves air through the ductwork — can also cause inadequate airflow even if the motor is running. Without sufficient air movement, the heat exchanger overheats and the limit switch remains open.
The furnace will not restart automatically. After the problem is corrected, power must be cycled off and back on to clear the hard lockout. A qualified HVAC technician needs to inspect the blower motor, test it electrically, check the blower wheel condition, and replace failed components.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Failed blower motor | Most common | ✗ Call a pro → |
| Failed blower wheel | Common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- When this code appears — blower motor or wheel failure requires professional diagnosis and replacement
✓ Verified against manufacturer service manual — March 2026