Why does my garage door opener hum but the door does not move? Why does my garage door opener hum but the door does not move? There are several potential reasons for the garage door opener to hum and the door does not move. The trolley may be stuck on the stop bolt or stop tab. There may be stripped gears, a stripped rack, a bad capacitor, or motor. To prevent possible SERIOUS INJURY OR DEATH from electrocution, disconnect ALL electric and battery power (if your opener has the EverCharge standby power) BEFORE performing ANY service or maintenance. To resolve humming issues for a chain or belt drive If the garage door opener hums twice: Check the trolley and ensure it is not stuck on the stop bolt or stop tab. See How do I get the trolley off the stop bolt or stop tab? Remove the metal cover and inspect the capacitor. Look for oil or swelling, these are telltale signs of a failed capacitor. If the capacitor is replaced and the humming has not been resolved, replace the motor.

If the garage door opener hums for about 30 seconds: Ensure the door is connected to the garage door opener. Use the emergency release handle to reconnect the door. See  How can I disconnect the garage door opener to manually open or close my garage door? Check the belt or chain to be sure it has not fallen off the sprocket. After re-installing the chain or belt back on to the sprocket, ensure to check your owners manual on setting the tension to the chain or belt. If the belt/chain is connected properly, remove the metal coverto inspect the gears. If you see white plastic shavings inside the unit, or the gears appear to be worn or stripped, replace the gears. If the garage door opener is a screw drive, check for a stripped rack. It is a small black piece that runs up and down the screw. If it appears to be worn out even a little, replace the rack. If the garage door opener hums until unplugged, the receiver logic board is damaged and must be replaced. If this is a new installation, verify that the correct bolts are used to mount the rail to the chassis.

If longer bolts are used, they will interfere with the operation of the motor. Make sure you are using the bolts that came already installed on the chassis. The bolts are black in color, not silver. To resolve humming issues for jackshaft operators (3800/8500) If motor hums for 1 to 2 seconds, the door may be disengaged. Pull on the red emergency cord, then try opening door manually. If motor hums for more than 2 seconds, the collar may be slipping on the jackshaft. Tighten all 6 screws on the collar then try operating the door again. For further assistance on the 3800/8500, check the LED indicator light for diagnostic codes. Answers others found helpful How do I get the trolley off the stop bolt or stop tab? Belt and Chain Drive Gear and Sprocket Kit Replacement Instructions CDO - Logic 3 and Logic 4 single phase operator clicks and hums Screw drive does not fully open or close GDO - How to resolve issues with an out of phase chain/belt drive opener

Chamberlain 1/2 hp garage door motor hums but nothing moves.... Chamberlain 1/2 hp garage door motor hums but nothing moves. It is about 12 yrs old. Is there a repair I can do or is it time to replace?door lock cylinder retainer Is it a hum or a motor that is running but not driving stripped gears.http://www.diyforums.net/changing-gear/shaft-assembly-on-chain-drive-opener-184.htmlpatio screen doors tucson sounds like a motor running but not driving anythinglowes screen door kit Did you open the link I included ??sliding glass patio door lowes yes, printing it out and going to work on it.emergency exit door regulations uk

I will reply again in a couple minutes.There is so much white plastic shavings. there is no droop in the chain. So it looks like I need to replace the shaft and gear assembly. I had the same problem. windows and doors guildfordMy garage door was in open position, when I press the button to close it, all I hear was hum noise for 2 seconds.car window repair tallahassee fl What I found out the problem is the metal piece (Trolley) that door arm attach to was in contact with the stop screw on the rail. In Chamberlain manual that piece is called Trolley. Door Arm is attahced to Trolley and can be released from Trolley by pulling the rope. There is a big screw on the rail that stops trolley from going further towards the opener housing. You should leave some space between the screw and trolley.

Once I made the adjust, it works. I have a photo but I cannot post it here. You just solved my problem. Thanks for saving my $$ & time! Just thought i'd add to the success stories as this ended up being my exact issue as well. The trolley had gotten stuck against the bolt, i had actually had to gently tap on it with a flat head screwdriver and mallet before it would start moving again but after making the neccessary adjustments we're back in business. Thanks for the useful info, so glad it didn't end up being a logic board. Thanks that worked for us too. Worked like a charm. The capacitor supplies an extra power surge to a garage door opener. Most garage door openers use 120-volt electricity from a wall outlet located in the garage and draw about 4 amps of current when they are in operation. Like the compressor in a refrigerator or the fan motor in a furnace, the motor in a garage door opener draws much more than than this when it starts, however. This extra power comes from the capacitor, an electrical component included with every garage door opener.

How Capacitors Work Capacitors, also known as condensers, are common electrical circuit elements. Their purpose is to store electrical energy and provide bursts of power that are stronger than the power normally flowing through the circuit. A capacitor has two conducting plates or surfaces separated by a dielectric, such as paper or glass. Power incident on one of the conductors can't flow until its voltage exceeds the threshold created by the dielectric. When the conductor discharges, power must build up once more before it will discharge again. Capacitors can thus provide cyclical bursts of high-energy electricity, but in a garage door opener, only one such burst is needed. Start Capacitors The capacitor in a garage door opener is known as a start or electrolytic capacitor. When you energize the motor by pressing the switch or using the remote, power flows to the start capacitor and builds up enough charge to supply the torque to open the door. Storage capacity, or capacitance, is measured in farads, where one farad equals a voltage of one volt created by a current of one coulomb.

The capacitance of a start capacitor is typically larger than that of a run capacitor, which energizes cyclically while the motor is running. It is usually around 100 microfarads. Bad Capacitor Symptoms When the capacitor isn't working in your garage door opener, the symptom is usually humming or buzzing without any motion of the door when you press the start button. If the capacitor isn't completely bad, the motor may start working after you manually start the motion of the door, but the motor may stop again while the door is partially open. Some door openers have warning lights that flash when the capacitor is bad, and the combination of humming and flashing lights can be disconcerting. The remedy is simple: replace the capacitor. Replacing a Capacitor When you remove the cover from the door opener, you should find the capacitor clamped to the side of the housing, It's usually a large black cylinder. It has two blue wires connected to one terminal and two red ones connected to the other.