LiftMaster MyQ Smart Garage Hub Troubleshooting

LED Indicators (Hub)

Door Sensor Won’t Program to the Wi-Fi Hub

1. Press the sensor Test button.
   • Yellow blinks + hub beeps once/twice = linked (slot 1/2).
   • No blink → replace CR2450 battery. If still no blink, replace sensor.
   • Blinks but won’t enroll → clear the target hub slot: press/hold 1 or 2 on the hub until yellow LED turns off, then re-add.
2. Sensor types: G821LMB-2SENSOR / 821LMC-SENSOR (red LED, RF) work with 821LMB/821LMC-S natively and 821LM/MyQ-G0301 on current firmware. 821LM-SENSOR (yellow LED, Bluetooth) pairs only to 821LM or MyQ-G0301.

Hub Not Connecting to Internet

• Verify 2.4 GHz signal in garage (phone shows ≥2 bars is ideal).
• Join the hub near the router, then relocate; confirm green solid.
• If unstable, add a Wi-Fi range extender near the garage.

“Add non-MyQ Garage Door” Option Missing

The hub has data in both non-MyQ slots. Fix:

1. Preferred: delete the hub from the account, power-cycle, re-register by serial.
2. Or: clear slots manually — press/hold 1 until yellow off; repeat for 2, then power-cycle.

Android Won’t Connect During Setup

• Disable auto-switch features (Smart Network Switch / Adaptive Wi-Fi).
• Wi-Fi Advanced: uncheck “Check for internet service”.
• Reconnect to the hub’s temporary network and retry.

iOS Says Hub Already Paired (Bluetooth)

1. With hub blue light flashing, open Settings → Bluetooth.
2. Tap the “i” next to MyQ-XYZ → Forget This Device.
3. Re-pair and share Wi-Fi credentials again.

Hub Not Registering

Each hub can be linked to one account. If it’s on a LiftMaster/MyQ account, remove it there first, then register on Alarm.com.

Remotes Disconnected During Enrollment

Holding the opener’s Learn too long wipes all remotes. Re-enroll each remote; next time, press Learn briefly.

821LM Doesn’t Operate the Opener

1. Confirm opener compatibility and that the door moved during enrollment.
2. If tilt falsely triggered, delete and re-add; choose Unknown manufacturer if needed.
3. Manual program (821LM only):
   1. Program sensor: Press hub 1 or 2 (yellow solid) → press sensor Test until hub beeps (1=slot1, 2=slot2).
   2. Program opener: Press hub Settings (blue solid) → hold until green/yellow alternate → press again (yellow solid). Press 1 or 2 per slot mapping, then Settings (blink) → press opener Learn → press 1/2 until click → press again to activate → hold Settings to exit (blue blink or green solid).

Two Openers: Both Doors Move

Both motors learned the same hub channel.

1. Erase the motor’s remote memory (then re-add remotes/codes).
2. On 821LM, clear slot 1 (hold 1 ~10s) and slot 2 (hold 2 ~10s).
3. Power off the motor you’re not enrolling; enroll the powered one.
4. Swap power and enroll the second; then power both and test.

Door Sensor Shows “Unknown” or “Malfunction”

1. Open/close via wall control to force a status update.
2. Refresh the equipment list in your account.
3. Ensure hub is within ~30 ft open air of the sensor.
4. Press Test on sensor:
   • No yellow blink → replace CR2450; if still none, replace sensor.
   • Yellow blinks but hub doesn’t beep → remove door from account, clear that hub slot, re-add the door.

Door Sensor Low Battery

Replace with a new CR2450 lithium coin cell, then cycle the door once to refresh status.