Bought inside/outside wireless weather station. Inserted batteries as directed. Inside works, outside temps don't register at all.

You shoud use new batteries because you dont know how old the ones that are present are. You should also use lithium battteries in the weather station sensors because they last longer and have better low temp response. The batteries should have marks on them that correspond with the marks inside the sensors.

I've had the same problem since I bought this unit 2+ years ago; when the outside temperature moves into the freezing zone, the sensor stops transmitting. I contacted Lacrosse-- all they could suggest was change the batteries. My solution: throw it in the trash!

After inserting the batteries, DO NOT set the time until the OUTSIDE temperature registers. That's the trick.

I had the same problem, Since the outside temp wouldn't read, I figured it was the outside unit batteries. Went through half a dozen AAA batteries and wouldn't read. It was the indoor unit. Had the same bats I installed 3 years ago. DUH! Replaced the AAA, and all was well. When the inside batteries die out, it has just enough juice to read indoor temp, but not enought to sense exterior signal.

My outside display stopped working, but the inside display still worked. I found that one of the two batteries in the inside unit was almost all the way dead. Once I replaced both batteries the outside display worked. I also checked the batteries in the outside unit. After all batteries were installed, I pushed the small button that is inside the battery compartment on the outdoor unit. It's now working perfect..

All these wireless weather station devices have to be paired to the base unit whenever the batteries are changed in any of the remotes. It's a poor design issue, but there is no way around it, due to the nature of wireless operation.

Place both units near each other and look on the back of your base and remote sensor units, you should find a reset button (or a small hole). Either press the button or use the end of a paper clip to depress and hold the reset on each unit; Base 1st, then the remote 2nd.

After a brief moment, the remote should register with the base and you'll be back getting wireless readings.

Hope you find this Very Helpful and best regards!