The sensor should flash briefly when you put in good batteries. Afterwards it should flash about every couple of minutes. If you have a voltmeter check the batteries are at least 1.3 volts (the voltage will drop when they get colder). Ideally they should be about 1.4-1.6 V. Try cleaning the battery compartment contacts and springs with a cotton bud and alcohol. If the contacts look rusted then use fine emery paper or scrape with a screwdriver to remove the rust and tarnish. Clean the ends of the batteries by rubbing with a tissue or cloth. When inserting new batteries twist them inside the battery housing to help make better contact. Another thing you might try is to use a screwdriver to very carefully stretch the springs in the battery compartment a little to allow better contact. (Warning do not pull the spring too hard so as not to damage it) If using new batteries does not help then the sensor may have a fault. If the led on the outdoor sensor is flashing but the indoor sensor does not pick up the signal you can try putting the indoor sensor closer to the outdoor sensor. Otherwise you may need to re-tune the indoor sensor to the correct frequency (there is a small adjustable screw inside).
SOURCE: Omnitech Wireless Weather Station model
Push and hold down the channel button, wait for beep, then on the sensor, push and hold the tx button, wait for beep.
SOURCE: the sensor from my weather station is not registering outside temperature
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!
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