Genie 18004B 50–60 MFD 220V Garage Door Opener Start Capacitor

The Genie 18004B is a replacement motor start capacitor designed for compatible Genie and Overhead Door garage door openers using a 50–60 MFD, 220 VAC capacitor.

A start capacitor provides the temporary electrical boost needed to help the opener motor begin turning. A weak or failed capacitor can cause the motor to hum, hesitate, struggle to start, or fail to operate even though electrical power is reaching the opener.

### Product Features

- Genuine Genie replacement start capacitor
- 50–60 MFD / µF capacitance range
- 220 VAC rating
- 60 Hz
- Designed for compatible Genie and Overhead Door openers
- Replaces 18004B / 18004-B / X-18004-B applications
- Helps restore proper motor starting torque
- Direct replacement when electrical specifications match
- Cylindrical capacitor configuration
- No programming required after replacement

### Specifications

- Manufacturer: Genie
- Part Number: 18004B / 18004B.S
- Product Type: Motor Start Capacitor
- Capacitance: 50–60 MFD (µF)
- Voltage Rating: 220 VAC
- Frequency: 60 Hz
- Approximate Length: 3-3/8"
- Approximate Diameter: 1-7/16"
- Application: Garage Door Opener Motor Starting Circuit
- Quantity: 1 Capacitor

### What Is It Used For?

This capacitor helps provide the extra starting torque required when the garage door opener motor first turns on.

Common symptoms of a failing start capacitor may include:

- Motor hums but does not start
- Opener starts slowly or inconsistently
- Motor struggles to begin moving the door
- Capacitor shows swelling or leakage
- Burnt electrical odor near the capacitor

These symptoms can also be caused by other opener or garage door problems, so proper diagnosis is recommended before replacing the capacitor.

### Compatibility

Designed for compatible Genie and Overhead Door openers originally equipped with a:

50–60 MFD
220 VAC

start capacitor.

Genie confirms compatibility as a replacement for capacitors marked:

- 18004B
- 18004-B
- X-18004-B
- Select original capacitors with equivalent approved ratings

Always compare the part number, MFD rating, voltage rating, physical dimensions, and terminal configuration of the original capacitor before ordering.

### Important Electrical Rating

The replacement capacitor must match the requirements of the opener motor.

Do not select a capacitor based only on physical size.

Verify:

- Capacitance / MFD rating
- Voltage rating
- Original part number
- Motor/opener model
- Terminal configuration

Installing an incorrectly rated capacitor can damage the opener motor or electrical components.

### Package Contents

Includes:

- 1 – Genie 18004B 50–60 MFD 220V Start Capacitor

Motor, opener, mounting bracket, wiring, and other components are not included unless specifically stated otherwise.

### Important Safety Warning

Capacitors can retain a potentially dangerous electrical charge even after the garage door opener has been unplugged.

Disconnect power before servicing the opener and follow the manufacturer's procedures for safely discharging and replacing the capacitor.

If you are not experienced with electrical components, replacement should be performed by a qualified garage door or electrical service technician.