Range Hood Ventilator Motor For: NuTone SM550-SU ERSM550-SU

ERP SM550-SU Range Hood Ventilator Motor

This ERP replacement single-speed ventilator motor is intended for compatible NuTone range hood applications. It can restore ventilation when the original motor is worn, noisy, intermittently operating, electrically open, or otherwise confirmed defective. Match the complete appliance model, original motor, shaft, impeller, rotation, mounting, wiring, and plug before ordering.

Compatible Part Numbers

• SM550-SU
• ERSM550-SU
• UPC: 840993045547

Key Features and Specifications

• Application reference: NuTone.
• Speed: Single speed.
• Shaft diameter: 7/32 inch, flat.
• Shaft length: 1 inch.
• Rotation: CCW when viewed from the shaft end.
• Stack: Verify the original component and service documentation.
• Leads: 9 inches with 120 VAC plug.
• Impeller diameter: 4-9/16 inches.
• Shaft hole inside diameter: 0.218 inch.

Fixes These Symptoms

• Range hood ventilator does not run.
• Fan runs intermittently or stops unexpectedly.
• Motor is noisy, vibrates, or turns slowly.
• Ventilation is weak after the impeller, duct, and controls are confirmed.
• Visible motor damage or an electrically open winding.

These symptoms may also be caused by switches, controls, wiring, impellers, bearings, obstructions, or blocked ductwork. Diagnose the appliance before replacing the motor.

Compatible Models

Fits various models. Please verify compatibility with us before ordering. The NuTone brand reference does not guarantee fitment to every model.

Compatible Brands

NuTone.

Installation Guidance

1. Disconnect electrical power before service and verify the circuit is de-energized.
2. Record the original motor wiring, plug, shaft orientation, rotation, impeller, mounting, and hardware before removal.
3. Confirm the shaft dimensions, rotation, plug, impeller diameter, mounting arrangement, and appliance model against the original and service documentation.
4. Inspect the impeller, housing, duct, switch, wiring, and bearings for obstructions or damage before installation.
5. Secure connections and route wiring away from moving or hot components.
6. Reinstall covers, guards, and the impeller before restoring power. Test for correct rotation, airflow, noise, and safe operation.
7. Use a qualified technician when electrical wiring, appliance access, or compatibility is uncertain.

ERP replacement part. Confirm the full appliance model and original part number before ordering.