Will not display outside temperature even though I changed the battery on both the inside and outside unit

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.

Double check your batteries in both the outside and inside units changing the outside ones FIRST before you change to reset the inside batteries, IF you have two separate units. If this doesn't help, it could be the control switch/relay for your interior unit. Please go to your browsers information line and type in DOMETIC CORPORATION.COM AND SEARCH FOR YOUR SPECIFIC THERMOSTAT by entering your CCC2 Comfort Control Center 2 information. They should have a help section at this website.
I hope this helps. Check to see if its still under warranty.

how do you adjust the weather forecaster 63-1090 clock

Check the batteries in the main unit. If they get low it will only show dashes for the remote sensors.