How To Test Garage Door Opener Capacitor

Look inside the garage door opener and locate the long cylinder capacitor with 4 wires coming out it will be in either gray black yellow or blue.

How to test garage door opener capacitor.

There should be wires that connect to the same colors much like jump starting a car. When you energize the motor by pressing the switch or using the remote power flows to the. You can use an ohm meter to test a capacitor. You can test the capacitor with an ohm meter.

Write notes or draw a picture of where the wires go for reassembly. 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. The capacitor in a garage door opener is known as a start or electrolytic 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. Disconnect the power to the garage door opener and remove the wires from the capacitor. Symptoms include the hum of a garage door opener and its failure to start working or the failure of an air conditioner to cool the room. Do this by hooking the voltmeter s wires up to the capacitor itself.

This light may be located beneath the plastic button requiring you to pop the button off with a screwdriver. If the green button is blinking the garage door is locked.