When a garage door opener diagnostic LED blinks three times, it typically indicates an issue with the door control wire circuit, push-button wiring, or RPM sensor / rotation sensor failure. On many modern openers, a 3-flash code points directly to a short in the wall console wiring or a failing speed sensor that prevents the motor from tracking door travel correctly. Callout type="warning" title="Electrical Safety Warning": Unplug the opener before inspecting low-voltage terminal wires. Verification: Check that wall control wires are securely connected to the correct terminal screws and test operation.
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