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2500B, 2500D, 3500 and 3850 - Diagnostic Code Chart
Your garage door opener is programmed with self-diagnostic capabilities. The diagnostic LED next to the learn button will flash a number of times, then pause before repeating, signifying it has found a potential issue. The Diagnostic Chart is below.
| Code | Description | Symptom | Things to look for |
|---|---|---|---|
| 1 | Door will not close, lights flash Note: Any garage door opener or replacement logic board manufactured after February 3, 2022, will no longer have this feature. | One or both of the indicator lights on the safety reversing sensors does not glow steady | Inspect the sensor wires for a short (staple in a wire), incorrect wiring polarity (black/white wires reversed), broken or disconnected wires; replace or reattach as needed |
| 2 | Door will not close, lights flash Note: Any garage door opener or replacement logic board manufactured after February 3, 2022, will no longer have this feature. | One or both of the indicator lights on the safety reversing sensors does not glow steady | Inspect the sensor wires for a short (staple in a wire), incorrect wiring polarity (black/white wires reversed), broken or disconnected wires; replace or reattach as needed |
| 3 | Door control not working | LED is not lit on door control | Inspect the door control wires for a short (staple in wire), and replace as needed. Disconnect wires at the door control, then touch the wires together. If the garage door opener activates, replace the door control. Short between the red and white terminal |
| 4 | Door will not close, lights flash Note: Any garage door opener or replacement logic board manufactured after February 3, 2022, will no longer have this feature. | Sending indicator light glows steady, receiving indicator light is dim or flashing | Loosen the wing nut on the receiving sensor, clean the lens, realign the sensor until it glows steadily, then tighten the wing nut and secure the brackets. Verify the door track is firmly secured to the wall and does not move |
| 5 | No RPM in the first second | No movement, grinding sound, 0-6" of door travel | Stop or obstruction, bad motor gears, disconnected encoder harness, open armature, brush failure |
| 6 | RPM pulses detected after the motor was turned off | Door coasts down or up after limits have been reached | Check the door, does it coast down or open on it's own when disconnected from the opener? If the door isn't extremely heavy or out of spec for the opener replace the motor |
| 7 | Motor short | No movement or sound | |
| 9 | Not used | N/A | N/A |
| 10 | Force reversal, up direction | Door stops during the open cycle | Cycle the opener again and it should automatically ratchet up to the next force setting |
| 11 | Max force, down direction | Door stops and reverses during close cycle | Reset limits and forces, it unable to resolve look for a door issue |
| 12 | Force reversal, down direction | Door stops and reverses during close cycle | Cycle the opener again and it should automatically ratchet up to the next force setting |
| 13 | Max force, up direction | Door stops during open cycle | Reset the limits and forces, if unable to resolve look for a door issue |
| 15 | Bad CRC | No movement, no sound | This is an error detecting code known as cycle redundancy check, logic board needs to be replaced |
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