Outside temperature shows incorrect. Will not change upon reset.

my unit tells me to insert fresh batteries into the outside sending unit first. then insert new batteries into the inside receiving unit. after the outside temperature shows up, then can reset my inside unit's time, choose F or C and
switch channels. please try changing channels if your
outside temp doesn't show. you can do both units in the house then put one outside after they work properly.

ambient temp sensor outside faulty or the interior display

or both

Have you changed the batteries in the outdoor temperature sensor?

The outside air temperature indicator's displayed temperature can be recalibrated. Press and hold the reset select button for 10 seconds . While you continue to hold the button, the display will scroll through temperature settings from +3 to -3. When the desired correction value appears on the display, release the button, and the recalibrated outside air temperature will be displayed. Each time a desired correction value is entered, it replaces the previous value. Give that a try mmkayyy:)

Contact Intermatic:
http://www.intermatic.com/en/CustomerSupport.aspx

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you probably need to 'pair' the outdoor sensor with the main base: look for a 'channel' button, as these units usually can get information from several sensors and differentiate them by a channel number.

I would suspect that the connection to the outside temperature sensor is not good or the sensor itself is bad. Check the connection and clean and reattach as necessary. Otherwise replace the sensor. I think they're pretty reasonably priced.

The outside air temperature sensor for a 2000 Windstar is located under the front bumber on the passengers side. It is clearly visible if you lay down and look through the lower two air openings in the plastic bumper. It is the only electrical device in that area and it is made of black plastic.

you need to replace the ambient temperature sensor or do the math

check the sensor itself it may have become disconnected, have a broken wire to it or be a bad sensor its located behind the grille

Try changing the batteries in the CLOCK. I had the same problem in a 3M similar clock and it didn't read the transmitter correctly or eventually, at all, when the CLOCK batteries were getting low.