Start with the handset battery, then try a second handset or the wall switch. If the wall switch works, the problem is the handset or the receiver. If nothing works, check that the opener has power and that nothing is blocking the photocell, because a blocked sensor can stop the door from moving.
If those checks do not help, Qasar Al Neil Automatic Doors can test the receiver, reprogram handsets and check the control board.
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