the q7 max keeps getting stuck on my medium-pile rug, says 'obstacle detected' and backs off.

Diagnosis

The Roborock Q7 Max utilizes a combination of physical bumper switches and infrared sensors to detect obstacles. When navigating medium-pile rugs, the dense fibers or a slightly raised edge can apply constant pressure to the floating front bumper. Because the bumper is designed to be highly sensitive to prevent damage to furniture, the robot interprets this sustained pressure as a physical collision with a solid object rather than a soft surface. This triggers the "Obstacle Detected" error message and forces the robot to execute its retreat sequence. This is especially common on rugs with a slight "lip" or those that have bunched up over time. You can confirm this is the issue if the robot consistently fails at the same entry point of the rug, or if you notice the bumper is slightly depressed when the robot is sitting stationary on the carpet fibers.

How to Fix It

To resolve this, you need to adjust the robot's driving logic and suction power to ensure it has enough momentum and sensor clearance to override the bumper sensitivity.

1. Open the Roborock App and select your Q7 Max from the device list.
2. Tap the three dots (Settings) in the top right corner of the main screen.
3. Navigate to Vacuum Settings and locate the Carpet Settings menu.
4. Enable Carpet Boost+. Set this to "Always" or "Automatic." This increases the motor RPM, which creates a slight change in the chassis's center of gravity and provides more torque to the drive wheels to push through the pile.
5. Go back to the main map view and select Edit Map.
6. Select No-Go Zone or Virtual Wall. Instead of blocking the rug entirely, draw a narrow "No-Go Zone" specifically over the transition strip or the exact edge where the robot typically triggers the error. This forces the robot to approach the rug from a different, flatter angle.
7. Clean the front bumper. Use a can of compressed air to blow out any dust or debris lodged in the gap between the bumper shroud and the main chassis, as trapped grit can make the bumper "stick" in the depressed position.

If That Didn't Work

• Install Transition Strips: If the rug has a high edge, install a low-profile rubber or aluminum transition strip (approximately 3mm to 5mm thick) at the entry point. This creates a ramp that prevents the bumper from hitting the rug at a 90-degree angle, allowing the robot to glide onto the surface.
• Check for "Rug Bunching": Medium-pile rugs often slide on hardwood or tile. If the rug has shifted and created a fold or wrinkle, the Q7 Max will almost always trigger an obstacle error. Use a non-slip rug pad or double-sided rug tape to ensure the surface is perfectly flush with the floor.
• Modify the Bumper Tension: For advanced users, check if the bumper is sticking. Gently press the bumper in and out across its entire width. If one section feels "stiffer" than the others, a small piece of debris is likely lodged inside. Use a thin plastic shim or a toothpick to clear the gap around the perimeter of the bumper.
• Update Firmware: Ensure your device is on the latest firmware version. Roborock frequently releases "driving logic" updates that calibrate the bumper sensitivity specifically for different floor transitions to reduce false-positive obstacle detections.

Heads Up

• Avoid using high-pile "shag" rugs with the Q7 Max; the long fibers can wrap around the main rolling brush and trigger a "Main Brush Stuck" error.
• Regularly check the cliff sensors on the bottom of the unit. If they are coated in dust, the robot may misinterpret the dark colors of a medium-pile rug as a "cliff" or drop-off, causing it to back away.
• If you use a "No-Go Zone" to avoid a specific rug edge, remember to update these zones if you rearrange your furniture or move the rug.
• Do not attempt to lubricate the bumper with oils or WD-40, as this will attract dust and hair, eventually seizing the bumper mechanism permanently.