Furnace Blower Not Working? Causes & Blower Motor Cost
If the furnace or AC runs but almost no air comes out of the vents, the blower isn't moving air: a failed blower motor, a bad motor capacitor or a control problem. Replacing a standard (PSC) blower motor typically costs $400–$900 installed, and a variable-speed (ECM) motor $600–$2,300.
Last reviewed September 2026
Troubleshoot it now
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Switch the fan to on
Set the thermostat fan from auto to on. If air starts flowing, the blower works and the problem is elsewhere.
Signs it's this problem
- Little or no air from the vents while the system runs
- Humming from the furnace but no airflow
- A burning smell from the indoor unit
- The furnace overheats and shuts off repeatedly
Why it happens
The blower pushes heated or cooled air through the ducts for both the furnace and the AC. Motors wear out after years of running, their start capacitors fail, and a severely clogged filter makes them overheat.
Not sure? Run the heating and cooling problem finderHow to fix it, step by step
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Safety: Turn off power before opening the furnace. A burning smell means switch the system off and call a technician.
Furnace Blower Not Working? Causes & Blower Motor Cost cost
| Job | Typical cost |
|---|---|
| Replace a standard (PSC) blower motor | $400–$900 |
| Replace a variable-speed (ECM) blower motor | $600–$2,300 |
Got a quote? Check if it's fair
Typical professional price for this job: $400–$2,300
Common questions
Can I run my furnace if the blower doesn't work?
No. Without airflow the furnace overheats and shuts off repeatedly, which stresses the heat exchanger. Turn it off until it's repaired.
Why are ECM blower motors more expensive?
They're variable-speed motors with built-in electronics. They cost more to replace but use less electricity and run more quietly.