B&D SDO-6v3 Garage Door Closes Then Opens Again

B&D SDO-6v3 Garage Door Closes Then Opens Again: How I Fixed It

My B&D SDO-6v3 garage door opener developed a strange intermittent fault. The garage door would close all the way to the ground, but the motor would continue trying to close it. Around 10 to 20 seconds later, the door would unexpectedly open again.

What made this especially frustrating was that it didn't happen every day. I'd noticed the problem during very hot weather and also on particularly cold days. On other days, the garage door worked perfectly.

After some troubleshooting, I discovered that the likely problem was the closing travel limit. Resetting the travel limits resolved the issue without needing to replace the motor or any parts.

The Problem: Garage Door Closes, Then Reopens

These were the symptoms I experienced:

• The garage door travelled down normally and reached the concrete floor.
• Even though the door was closed, I could still hear the motor trying to drive it further down.
• Approximately 10 to 20 seconds later, the door automatically reopened.
• The motor produced eight audible beeps.
• The blue DOWN arrow LED on the motor was flashing.
• The fault seemed more likely to occur during very hot or very cold weather.
• On other days, the garage door operated without any issues.

Why Did It Happen on Hot or Cold Days?

This was one of the most confusing aspects of the problem. The garage door could work perfectly for weeks and then suddenly start reopening after closing.

My theory is that temperature changes were affecting the mechanical tolerances or resistance of the garage door.

Metal components expand and contract with temperature, while rubber seals, tracks and rollers can behave differently depending on the conditions.

If the closing travel limit is already set slightly too far down, these small changes could be enough to trigger the opener's obstruction detection.

In other words, the temperature itself may not have been the actual fault. It may simply have exposed a closing limit that was already marginal.

This is a plausible explanation rather than a confirmed measurement of thermal expansion.

The Key Clue: The Motor Was Still Trying to Close

The breakthrough came when I listened carefully to the motor after the door reached the ground.

Although the door appeared fully closed, the motor hadn't actually stopped. I could still hear it trying to drive the door further down.

This suggested that the motor hadn't correctly recognised the closed position.

The B&D SDO-6v3 has an obstruction detection system designed to reverse the door when excessive resistance is detected during closing.

The eight audible beeps and flashing blue DOWN arrow were additional clues that something wasn't right with the closing cycle.

The Fix: Resetting the Garage Door Travel Limits

Fortunately, the solution was straightforward. I needed to recalibrate the motor's opening and closing travel limits.

The B&D SDO-6v3 has four control buttons:

• Blue DOWN arrow: Moves the door down.
• Red STOP/SET: Confirms settings and travel positions.
• Green UP arrow: Moves the door up.
• Yellow MODE: Accesses configuration settings.

Step 1: Remove the Plastic Control Cover

Initially, I couldn't even press the MODE button because there was a clear plastic cover over the controls.

There is a small notch along the bottom edge of the cover. Gently release and remove the cover to expose the buttons.

You don't need to dismantle the main motor housing.

Step 2: Clear the Existing Travel Limits

1. Press the yellow MODE button repeatedly until the gear-shaped indicator LED illuminates.
2. Press and hold MODE for approximately 10 seconds.
3. Release MODE when the main light stops flashing.
4. The blue DOWN arrow LED should now flash continuously, indicating that the previous travel limits have been cleared.

Tip: Continue with the programming promptly, as the opener may exit programming mode after a period of inactivity.

Step 3: Set the New Closed Position

1. Press and hold the blue DOWN button to lower the garage door.
2. Release the button before the door reaches the ground.
3. Use short presses of DOWN to move the door down in small increments.
4. Stop when the bottom rubber seal just touches the concrete floor.
5. If you move too far, press the green UP button to raise the door slightly.
6. Press the red STOP/SET button once to save the closed position.

The green UP arrow LED should now begin flashing.

Important: The bottom rubber seal should only just contact the floor. Don't continue driving the door down until the seal is heavily compressed or the door starts flexing.

Step 4: Set the Fully Open Position

1. Press and hold the green UP button to raise the garage door.
2. Release it as the door approaches the desired fully open position.
3. Use short presses of UP to fine-tune the position.
4. If you go too far, use the blue DOWN button to lower the door slightly.
5. Press the red STOP/SET button once to save the open position.

Step 5: Allow Automatic Calibration

After saving the open position, the motor automatically runs a calibration sequence to learn the door's travel characteristics and obstruction settings.

Keep people, pets and objects clear of the door during this process. Allow the calibration to complete without interruption unless stopping is necessary for safety.

Step 6: Test the Safety Reversal

Once calibration is complete, perform the obstruction reversal test specified in the B&D installation manual before returning the opener to normal use.

If the door fails the test, binds, or continues straining against the floor, stop using it and arrange professional servicing.

The Result: Problem Solved

After resetting the travel limits, the garage door started closing correctly again.

The motor now stops when the door reaches the ground instead of continuing to drive against the concrete.

Most importantly, the door no longer unexpectedly reopens after 10 to 20 seconds.

No replacement motor, circuit board, safety sensor or remote control was required.

I'll continue monitoring the door during future temperature extremes to make sure the problem doesn't return.

What to Check if Your B&D SDO-6v3 Does the Same Thing

• Closing travel limit: Does the motor continue trying to close after the door reaches the floor?
• Bottom rubber seal: Is it being compressed excessively or sticking to the concrete?
• Tracks and rollers: Is there any unusual friction or binding?
• Warning indicators: Are there audible beeps or flashing LEDs?
• Temperature: Does the problem happen more often during hot or cold weather?

Final Thoughts

What initially appeared to be an intermittent electronic problem turned out to be a travel-limit calibration issue.

The biggest clue was that the motor continued running even though the garage door was already fully closed.

If your B&D SDO-6v3 garage door closes and then reopens, particularly with eight beeps and a flashing blue DOWN arrow, checking the travel-limit settings may help identify the problem.

Safety note: Garage doors operate under significant spring tension. Do not adjust springs or other high-tension components yourself. If the door is difficult to move, binds, or fails its safety reversal test, contact a qualified garage door technician.

Reference: Official B&D SDO-6v3 / SDO-7v3 Installation Manual (PDF), Sections 12 and 13.