Furnace inducer (draft) motor not starting

Work from mechanical to electrical: does the wheel turn freely, is 120 V reaching the motor, and is the board sending it. A seized motor is replaced as an assembly; no output from the board points to the board relay or a safety input.

Cross-checked ~40 min moderateBrands: All

Before you start

Turn off power at the furnace switch and breaker before handling the inducer; live tests only with insulated probes.
Discharge any inducer capacitor before testing.
Do not disturb the vent connection beyond reconnecting it; vent repairs go to a licensed installer.

Diagnostic steps

Unlock all 8 steps with expected values

Full library + AI assistant for $34.90, one time.

Get lifetime access

OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work.

More furnaces guides

Guide · Furnace

Reading furnace LED flash codes by brand family (Carrier, Goodman, ICP, Rheem)

The flash code narrows the fault to one circuit before you open anything. Read it with power on, identify the board family, then use the door label to confirm. Only codes that two independent sources agree on are listed here.

8 steps ~10 mineasy

Guide · Furnace

Flame sensor microamp test and cleaning (measuring flame signal)

Measure the actual flame current in series with a µA DC meter before and after cleaning. A clean sensor with a low reading points to ground, wiring, board or burner flame problems rather than the rod itself.

8 steps ~30 minmoderate

Guide · Furnace

Furnace flame rollout switch tripped (safety shutdown, refer)

A rollout trip means flame or heat escaped where it should not: a blocked flue, blocked or cracked heat exchanger, dirty burners, or gas pressure problems. Our role is to identify the code, make the appliance safe, check for CO and refer. Do not bypass or keep resetting.

6 steps ~20 mineasy