Outdoor temperature reading shows -40 with wind chill -62. Outdoor temp is in fact +45.

Have you changed the batteries in the outdoor temperature sensor?

Batteries, both car and portable are affected by the temperature. Gently warm or replace as necessary.

Have you changed the batteries in the outdoor temperature sensor?

sound like faulty out side air temperature sensor located center radiator support.

Remove ALL batteries in transmitter AND clock.
Insert new batteries in outdoor transmitter.
Insert new batteries in the (receiver) clock.
Wait until outdoor temperature is received AND displayed on clock BEFORE setting time/date/etc.

you need to make sure your humidity level in the house isnt higher then what your humidifier will provide at any givin outdoor temp. this chart is in the owners manual. you cant remove the wires going to the ODS or it will give an error unless you have a resistor to put in its place. Anyway if the humidifier works in test mode according to AA it works so you may have higher humidity than you think, the highest your gonna get is 45% as the temp outside drops it will allow less humidity so it doesnt cause window condinsation (property damage) here is a copy of the chart. the #s on the left are the dial setting
TABLE 2 – % Relative Humidity Guide
Outdoor Temperature (°F)
-10°F 0°F 10°F 20°F 30°F 40°F
1 10% 10% 10% 15% 20% 25%
2 10% 10% 15% 20% 25% 30%
3 10% 15% 20% 25% 30% 35%
4 15% 20% 25% 30% 35% 40%
5 20% 25% 30% 35% 40% 45%
6 25% 30% 35% 40% 45% 45%
7 30% 35% 40% 45% 45% 45%

After replacing the transmitter batteries several times, I tried replacing the clock batteries. They must have been getting low. Once I put in new batteries in the clock it worked fine. Good Luck.