We are having a similar problem. Our girls are almost 7 weeks old, and this week we started letting them in the run during the day. We have an automatic coop door that opens at dawn and closes at dusk, so far all week we have been having to go out there after the door closes and chase down all 10 of them and place them in the coop. The thing is, we brooded (is that even the right word?) them in the coop since we had it set up before we got them and it was just easier. So they have been in the coop for 6 weeks, but once the door opens in the morning they run out and dont go back in until we put them in. Its been close to 90 during the day and around 65-70 at night so we took the heat lamp out when we started letting them outside during the day. We got the automatic door so we did not have to go out and put them up every night, in case we were out of town for the weekend or whatever. So how do I get them to go in the coop before the door closes and they are stuck in the run all night?
I would disable the photosensor and close the door manually after the birds are in.
Doors that close according to the level of light are inferior to timer activated doors because they can be fooled by cloudy/stormy weather. A timer activated door has to have the setting adjusted, but you KNOW when it will open and close and can monitor it more readily.