Why Does My Chamberlain myQ Sensor Think the Door Is Open When Closed?

Problem Description

Your Chamberlain myQ app shows the garage door as open even though the door is physically closed, or shows closed when it is open. The incorrect status prevents myQ automations from working correctly and causes false notifications. The door position sensor has misaligned from the opener rail or the sensor magnet has shifted and the sensor no longer reads the correct door position.

Symptoms

• myQ app shows garage door open when it is physically closed
• Door status in app never updates when door opens or closes
• App shows door closed but notifications say it is open
• myQ automation closes door based on false open reading
• Sensor LED does not change colour when door opens or closes
• Door status correct sometimes but wrong after a fast open or close

Recognize these? Here's what usually causes it.

Common Causes

• Door position sensor misaligned from its magnet on the door
• Sensor magnet fell or shifted from original mounting position
• Sensor battery low causing unreliable position readings
• Sensor interference from metal garage door reinforcement brackets
• myQ hub lost connection preventing status updates to the app
• Sensor placed too far from door header reducing detection accuracy

Tools & Requirements

Step-by-Step Solution

1

Check Sensor and Magnet Alignment

The myQ door sensor consists of two parts: a white sensor unit mounted on the door track header and a separate magnet mounted on the door panel itself. When the door is closed the magnet should be within 2.5 centimetres of the sensor. Open the garage door and look at both components. Verify the sensor has not rotated on its bracket and the magnet is still mounted on the door panel at the same height as the sensor. Even a small misalignment of 3 to 4 centimetres causes incorrect readings.

2

Reattach Loose Magnet

Inspect the door panel magnet which is typically a small white rectangular piece attached with adhesive or screws near the top of the first door panel. If it has fallen off or shifted reinstall it directly across from the sensor unit with a gap of no more than 2.5 centimetres when the door is fully closed. Use the double-sided tape included with the myQ sensor or use a small screw through the magnet mounting hole. After repositioning test by opening and closing the door while watching the status update in the myQ app.

3

Replace Sensor Battery

The myQ door sensor uses a CR2032 or CR2 lithium battery depending on the model. A low battery causes the sensor to transmit weak or intermittent signals producing unreliable door status readings. Open the sensor housing by pressing the tab on the back of the sensor and removing the cover. Replace the battery with a fresh one of the same type. After replacement the LED should blink once to confirm power. Test the door status in the myQ app by manually opening and closing the door twice.

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4

Power Cycle myQ Hub

Unplug the myQ Smart Garage Hub from its power outlet and wait 30 seconds. Reconnect power and wait 60 seconds for the hub to fully restart and reestablish its connection to the myQ cloud servers. Open the myQ app and check if the door status now shows correctly. The hub caches the last known door position and a stale cache from a connectivity dropout can cause the app to show the wrong status even when the sensor is reporting the correct position.

5

Re-Pair Sensor with Hub

If the status is still incorrect open the myQ app and go to Devices then tap the affected door sensor. Select Remove Device to unpair it from the hub. After removal follow the Add Device wizard to re-pair the sensor. During pairing stand next to the sensor and ensure the hub has strong WiFi. After successful pairing open and close the door three times and verify the app updates correctly each time before relying on the status for automations or notifications.

Quick Solutions

Still having issues? This is usually the deeper cause below.

Need More Help? Chamberlain Support

Note: The contact information below connects you directly to Chamberlain's official customer support team, not Trunetto. They can help with warranty claims, device replacements, and advanced technical issues.