Cause 1

Halogen Lamp

One or more of the halogen lamp bulbs may be burned out. Since it’s very difficult to visually determine if any of the halogen lamps have burned out, use a multimeter to test them for continuity. Alternatively, you can just try replacing the bulbs.

Cause 2

Light Bulb

Try replacing the light bulb before replacing any of the other parts associated with the light bulb.

Cause 3

Light Assembly

If the vent hood light is burned out, replace it. Some manufacturers do not sell the light bulb as an individual part; instead, they require you to purchase the light assembly.

Cause 1

Main Control Board

The main control board may be defective. To determine if the touchpad is defective, try pressing some of the keypad buttons. If some of the keypad buttons work while other buttons do not work at all, the keypad is likely defective. If none of the keypad buttons work, the main control board may be defective.

Cause 2

User Control and Display Board

The user control and display board may be defective. Control boards are often misdiagnosed—before replacing the user control and display board, first check all of the more commonly defective parts.

Cause 3

Touchpad

To determine if the touchpad is defective, try pressing some of the keypad buttons. If some of the keypad buttons work, while other buttons do not work, the touchpad might be at fault.

Cause 1

Blower Motor

Usually, when the blower motor hums but does not turn, it indicates that the motor shaft bearings are worn out. Some older, larger motors have oil spouts. If your motor has oil spouts, try adding oil to the motor bearings to get the fan to turn freely. If lubricating the motor bearings does not solve the problem, or if the motor can’t be lubricated, replace the blower motor.

Cause 2

Fan Motor

Usually, when the blower motor hums but does not turn, it indicates that the motor shaft bearings are worn out. Some older, larger motors have oil spouts. If your motor has oil spouts, try adding oil to the motor bearings to get the fan to turn freely. If lubricating the motor bearings does not solve the problem, or if the motor can’t be lubricated, replace the fan motor.

Cause 3

Exhaust Fan Motor

Usually, when the blower motor hums but does not turn, it indicates that the motor shaft bearings are worn out. Some older, larger motors have oil spouts. If your motor has oil spouts, try adding oil to the motor bearings to get the fan to turn freely. If lubricating the motor bearings does not solve the problem, or if the motor can’t be lubricated, replace the exhaust fan motor.

Cause 1

Blower Motor

To determine if the blower motor is defective, turn on the vent hood and check to see if the fan blade is spinning. If the fan blade does not spin, ensure that power is getting to the motor. If power is not getting to the motor, test the switch for continuity. If the motor is receiving power, but the motor won’t turn, replace the blower motor.

Cause 2

Fan Motor

To determine if the fan motor is defective, turn on the vent hood and check to see if the fan blade is spinning. If the fan blade does not spin, ensure that power is getting to the motor. If power is not getting to the motor, test the switch for continuity. If the motor is receiving power, but the motor won’t turn, replace the fan motor.

Cause 3

Exhaust Fan Motor

To determine if the fan motor is defective, turn on the vent hood and check to see if the fan blade is spinning. If the fan blade does not spin, ensure that power is getting to the motor. If power is not getting to the motor, test the switch for continuity. If the motor is receiving power, but the motor won’t turn, replace the exhaust fan motor.

Cause 1

Micro Switch

To determine if the micro switch is defective, use a multimeter to test the switch for continuity. If the micro switch does not have continuity, replace it.

Cause 2

Thermal Fuse

To determine if the thermal fuse has blown, use a multimeter to test the fuse for continuity. If the thermal fuse does not have continuity, replace it.

Cause 3

Incoming Power Problem

If the vent hood plugs into a wall outlet, plug something else into the outlet to determine if the outlet is getting power. If the vent hood is not plugged into a wall outlet, check the home circuit breakers or fuses.

Cause 1

Fan Motor

The fan motor bearings might be worn out. To determine if the motor bearings are worn out, try wiggling the motor shaft back and forth. The motor shaft should not move at all. If the motor shaft moves even by a slight amount, the motor bearings are worn out. If the bearings are worn, replace the motor. Do not attempt to lubricate or repair the motor—if the motor is defective, it must be replaced.

Cause 2

Exhaust Fan Motor

The exhaust fan motor bearings might be worn out. To determine if the motor bearings are worn out, try wiggling the motor shaft back and forth. The motor shaft should not move at all. If the motor shaft moves even by a slight amount, the motor bearings are worn out. If the bearings are worn, replace the motor. Do not attempt to lubricate or repair the motor—if the motor is defective, it must be replaced.

Cause 3

Drive Motor

Check the drive motor to determine if it is running. If the drive motor still runs, but [information to be provided], replace the motor. If the drive motor does not run, use a multimeter to test it for continuity. If the motor does not have continuity, replace it.

Cause 1

Selector Switch

To determine if the selector switch is defective, consult your vent hood’s wiring diagram and use a multimeter to test the switch for continuity. If the selector switch does not have continuity, replace it.

Cause 2

Rocker Switch

To determine if the switch is defective, use a multimeter to test the switch for continuity. If the rocker switch shows continuity at every setting, replace it.

Cause 1

Rocker Switch

To determine if the rocker switch is defective, use a multimeter to test the switch for continuity. If the rocker switch does not have continuity, replace it.

Cause 1

Drive Motor

Check the drive motor to determine if it is running. If the drive motor still runs, try turning the motor by hand. If the motor does not turn freely, this indicates that the drive motor is worn out and should be replaced. If the drive motor does not run, use a multimeter to test it for continuity. If the motor does not have continuity, replace it.

Cause 2

Rocker Switch

To determine if the rocker switch is defective, use a multimeter to test the switch for continuity. If the rocker switch does not have continuity, replace it.