I noticed my 5-in-1 weather station was posting erroneous readings, 145F and -40F in the same day. The other sensors appear to be working fine. I decided to change the batteries and noticed a some corrosion on one of the batteries removed from the 5-in-1. I changed the batteries anyways and now it is stuck on -40 degrees F. I found some help topics on the matter and performed the following steps:
"Perform a hard reset:This did not fix my issue, the unit is still reading -40 degree F. The model of my 5-in-1 is 01512 for the display and VN1TXCA1 for the outdoor unit. This is very frustrating as I've lost all of the history on the display unit. Please help!
1.Bring both the sensor and display unit indoors side by side.
2.Remove batteries from the sensor.
3.Remove batteries from the display unit and unplug the AC adapter (if applicable).
4.Wait 2 minutes to ensure any remaining battery power is discharged from both units.
5.Change the A-B-C Channel on both the display and sensor making sure they both match.
6.Reinstall batteries in outdoor sensor first.
7.Reinstall batteries in display unit second.
8.Let the units sit within a couple feet of each other for 30 minutes when comparing for accuracy
* The display should receive the signal within several minutes.
9.After a connection has been established you may place the sensor outdoors.
*If the signal connection fails after the units are separated try a new or different location for the display unit, the sensor or both."