My auto door is installed on the back of the coop and it doesn't get anything beyond part-sun during the height of daytime. No issues w/ early closure, even on a rainy day.
The default setting is #1, which closes at dusk and opens at dawn. Dusk and dawn are subjective times, more dependent on the amount of ambient light hitting the sensor vs. a specific time. On that note, is your sensor facing inside or outside the coop (meaning, did you mount the door inside or outside the coop)?
If setting #1 isn't doing the trick (after determining there were no obstructions over the sensor, etc.),change the setting to #2.
The instructions tell how to set programming, but here is a quick description:
SHOW PROGRAMMING
step 1: Open box cover and remove an alligator clip from its battery terminal. With left hand, be ready to re-connect alligator to the battery terminal.
step 2: With right hand thumb, hold in the push button switch (located behind green dome on the cover).
step 3: While holding in the push button switch with right hand, re-connect power with left hand.
step 4: Let go of switch and stand back to watch the Red LED.
step 5: In about 5 seconds, the LED will start flashing. Write down the numbers. When ADOR is finished showing all the numbers, the door will power the motor to shut the door (no matter what position the door was in).
Write down the numbers means you need to count how many flashes separated by idle time and you should get a series of numbers like: 1, 4, 6, ... etc.
CHANGE PROGRAMMING
You can only change one program setting at a time. That means you have to initiate SHOW PROGRAMMING for each setting you want to make and then pulse the button X times for your desired setting.
step 1: do the process of SHOW PROGRAMMING steps 1, 2, 3. Immediately go to the next step 2.
step 2: within about 4 or 5 seconds, you need to start setting a program number. If you wait too long, the ADOR will complete SHOW PROGRAMMING.
step 3: you set the program number "X" by simply pulsing the push button X number of times.
step 4: when you quit pulsing the button, ADOR will then go back to finish SHOW PROGRAMMING. Stand back and write down the numbers and you should see that you changed one of the settings. At the end of the "SHOW", ADOR records your settings so don't interrupt it till it is finished. When the motor starts, that's when you know it recorded your new setting.
EXAMPLE. CHANGE SETTING 1 to SETTING 2
step 1: Perform steps 1, 2, 3 under SHOW PROGRAMMING. Go immediately to following step 2.
step 2: Pulse the switch twice. The speed of your pulsing can be quite variable but just count it out verbally and pulse the button each count.
step 3: Stand back and write down the flashes. Wait till it finishes the SHOW and your new setting should be recorded.
step 4: If you want, disconnect the battery connection and then repeat SHOW PROGRAMMING to see that your new setting was remembered by ADOR.