Why won't my garage door close when sunny?
The obstruction detection system mounted on each side of the garage door is an infra red transmitter and detector. This is meant to ensure safety and prevents closure of the door if there is an obstruction like car or person blocking the doorway.
In your case the sunlight might be hitting the detector and not allowing the infra red signals to reach it. Many people provide some cone like an empty toiler roll around it to prevent sunlight hitting it.
Give it a try. You could also buy proper shades for the device from the supplier of the garage door.
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