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Diagnostic Codes for Chamberlain & Liftmaster Garage Door Openers
How to Read Diagnostic Codes
Chamberlain and LiftMaster openers use a built-in self-diagnostic system. When something goes wrong, the LED light near the Learn button will flash in a repeating pattern (e.g., 4 flashes, pause, 4 flashes). The number of flashes helps identify the issue.
To troubleshoot effectively:
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Count the flashes between pauses.
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Use the correct chart based on your opener model.
| Type of Garage Door Opener | Where to Find the Diagnostic Codes |
|---|---|
| Sec+2.0 myQ openers | Garage Door Opener Diagnostic Codes |
| AC powered garage door openers | What the flashing LED next to the learn button means |
| 3800/3900/8500/RJO20/RJO20C | Diagnostic codes for Residential Jackshaft Opener (RJO) |
| 8500W, LJ8900W, LJ8950W | Diagnostic Codes: Wi-Fi Residential and Light-Duty Commercial Jackshaft Operators |
| 2500B, 2500D, 3500 and 3850 -DC Unit- | 2500B, 2500D, 3500 and 3850 - Diagnostic code chart |
| 2500 | 2500 - Diagnostic code chart |
Need Help Identifying Your Model?
If you're unsure which opener you have:
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Look on the motor unit for a label with the model number.
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