Blower Motor Not Running? Here’s What to Check
Your blower motor is the part that pushes conditioned air through your ductwork and into your rooms. When it stops running, you’ll notice right away — the AC or furnace turns on, but no air comes out of the vents. Before you call a technician and spend $300 or more on a service call, there are several things you can check yourself.
Check the Basics First
Start with the simple stuff. Make sure the thermostat fan setting is on AUTO or ON. Check that the air filter isn’t completely clogged — a severely restricted filter can cause the blower motor to overheat and shut down on its thermal overload. Also check your breaker panel for a tripped circuit. These three things account for a surprising number of “dead blower” calls that cost homeowners hundreds in unnecessary service fees.
The Blower Motor Capacitor
Many blower motors use a run capacitor to start and maintain their speed. If the capacitor fails, the motor might hum but not spin, or it might not respond at all. The blower capacitor is usually a small oval or round canister mounted near the blower motor inside your air handler or furnace cabinet. It’s separate from the dual run capacitor in your outdoor unit.
Pull it and bring it in — we’ll test it for free. Blower motor capacitors typically run between $10 and $20.
The Motor Itself
If the capacitor tests good, the motor is the next suspect. Common failure modes include burned-out windings (no resistance on your multimeter between leads), seized bearings (motor is stiff or won’t turn by hand), or a tripped internal thermal overload (motor was running hot and shut itself off — it may restart after cooling down for an hour, but it’ll keep doing it).
A motor that restarts after cooling but keeps tripping is on its way out. Don’t wait for it to fail completely in the middle of a Dallas heat wave — replace it while you can plan the job on your own schedule.
The Control Board or Relay
On many systems, the furnace control board sends the signal to start the blower motor. If the board’s blower relay fails, the motor never gets power even though everything else works fine. You can test for voltage at the motor leads with a multimeter — if you’re getting 120V to the motor and it still won’t run, the motor is bad. If you’re getting no voltage, the problem is upstream in the control board, relay, or wiring.
Matching the Right Blower Motor
When it’s time to replace the motor, you’ll need to match several specs: horsepower (typically 1/4 to 1 HP for residential), RPM (usually 1075), voltage (115V or 230V), rotation direction, and the number of speed taps. The easiest approach is to bring the old motor in or give us the air handler’s model number. We stock direct replacements and universal motors that fit most residential systems.
Blower motors run $80 to $200 at our counter depending on the size. A pro charges $400 to $700 for the same job. Browse our motor selection for reference, then come in and we’ll match it and walk you through the wiring.
For more troubleshooting steps, check our complete blower troubleshooting guide.
Open To Public HVAC Parts — 10226 Plano Rd, Suite 104, Dallas, TX 75238. Call or text (214) 340-9421. Open Monday–Friday 10–7, Saturday 10–3.
