York TM9V080B12MP11 Error Code 11 Red Flashes: Limit Circuit Open 5-15 Minutes
What Does Code 11 Red Flashes Mean?
When the limit circuit remains open longer than five minutes but less than fifteen, this York board concludes that the blower is not moving air — because a working blower would have cooled the cabinet and closed the limit well before five minutes. It commits to that interpretation by entering a hard lockout, so the furnace will not restart on its own even after cooling.
The most common cause is a failed blower motor. This model uses a variable-speed ECM motor, which can fail from worn bearings, burned windings, or a failure of the electronic module built into the motor. A damaged or loosened blower wheel is the other listed cause: even with a running motor, a slipping or broken wheel cannot move enough air, so the heat exchanger overheats and the limit stays open.
This is the middle rung of the limit-circuit escalation ladder. The board reaches it from the 4 Red Flashes overheating code once the limit has been open past five minutes; if the limit instead stays open past fifteen minutes, the board escalates to the 5 Red Flashes code and assumes a rollout-switch trip. Eleven flashes specifically points the finger at the blower.
What You'll Notice
- The burners fire, but the blower never starts or clearly runs too weakly to move air.
- The furnace overheats and then shuts down into a lockout that does not clear by itself.
- You may hear a humming, grinding, or silent blower where normal airflow should be.
- Little or no air comes from the registers even though the furnace tried to run.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Failed blower motor | Most common | ✗ Call a pro → |
| Failed blower wheel | Common | ✗ Call a pro → |
How This Is Diagnosed
A technician confirms the blower is the problem by checking whether the ECM motor spins up and holds speed on command, testing the motor and its electronic module, and inspecting the blower wheel for damage, imbalance, or a loose set screw. They also verify the limit switch and its wiring so a good blower is not condemned for a bad limit signal. Because the fix involves motor or wheel replacement and clearing a hard lockout, this is professional work rather than a homeowner 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 burners fire but no air, or very little air, comes from the registers.
- The blower makes humming, grinding, or rattling noises, or does not spin at all.
- The furnace locks out and will not restart even after it has cooled.
- The furnace had been throwing 4 red flash overheating codes before escalating to this.
Frequently Asked Questions
Why won't my furnace restart after an 11 red flash code?
The board has entered a hard lockout because it concluded the blower is not working. It will not restart until the blower motor or wheel is repaired and power is cycled by a technician.
What is the difference between 11 red flashes and 5 red flashes?
Both come from the limit circuit staying open, but 11 flashes (open five to fifteen minutes) points to a blower motor or wheel failure, while 5 flashes (open over fifteen minutes) points to a rollout-switch trip and possible heat-exchanger problem.
Is a blower motor replacement expensive?
It varies by region and whether the motor, its module, or the wheel is at fault. A variable-speed ECM motor is a larger repair than a simple part swap; a technician can quote it after diagnosis.
✓ Verified against manufacturer service manual — March 2026