The Standard Display
The Standard Display appears when the unit is turned on and no other functions have been selected. The return air temperature appears in the display. In Figure below, the display shows a load compartment temperature of 38 degrees F, and that the unit is cooling the load compartment.
Note The unit undergoes a 20-second system
check when the On/Off switch is turned On. During this time, the Standard
Display shows the word CHEck.