To troubleshoot a Chamberlain door opener, first identify the specific problem and symptoms associated with it. Common problems with a Chamberlain door opener include failure to open or close, reversing before or after closing and the motor running continuously. Other problems include failure to operate and vibration.
Dirty safety sensors, a worn-out circuit board or shorted wiring to the safety sensors can result in the garage door opener failing to open or close. To fix this, clean and correctly align the safety sensors, replace the circuit board and repair the wiring to the safety sensors. A malfunctioning close force adjustment can cause the garage door to reverse before or after closing. Increasing the force setting on the opener can eliminate this problem.
A defective limit switch can cause the garage door motor to keep on running. Adjusting the switch either on the rear of the opener unit or on the track can help to rectify this issue. The garage door fails to operate when the unit is stuck in manual mode, or due to old and weak springs. Ensuring that the Chamberlain door opener is in active mode, replacing the spring, and tuning the force adjustment can help to rectify this problem.
Loose nuts and bolts or failure in the track system can cause the garage door opener to produce unusual noises. Tightening the components as required, as well as lubricating the travel mechanism as recommended by the manufacturer, can help to solve this problem.