How To Test Garage Door Opener Capacitor

Write notes or draw a picture of where the wires go for reassembly.

How to test garage door opener capacitor.

Short between the terminals of the capacitor to be sure it doesn t have an electrical charge stored in it. Do this by hooking the voltmeter s wires up to the capacitor itself. There should be wires that connect to the same colors much like jump starting a car. If the green button is blinking the garage door is locked.

This light may be located beneath the plastic button requiring you to pop the button off with a screwdriver. Disconnect the power to the garage door opener and remove the wires from the capacitor. Simply hold down the lock button for a couple of seconds until the green light stops blinking then try your remote or keypad again. The capacitor in a garage door opener is known as a start or electrolytic capacitor.

You can use an ohm meter to test a capacitor. When you energize the motor by pressing the switch or using the remote power flows to the. You can test the capacitor with an ohm meter. If you don t notice anything that may look like damage to the capacitor itself then you can hook up your voltmeter.

It s an all or nothing test that tells you if the capacitor is dead but it won t diagnose one that is still functioning weakly but about to stop working. Step 3 extract the old garage door starter capacitor.