Climate control stuck at HIGH

[ukrsindicat]

First time using the heat on my 4Runner this season, and it looks like it’s now stuck on the highest temperature setting. The temperature on the display doesn’t respond when I press the controls. Where should I start troubleshooting?
Here’s the video of the issue:
- YouTube

 

[SocalSam]

Blend door actuator could be bad. Fairly sure it is the Air Mix Damper Control Servo. If you have Limited, there will be a second servo on the left side. I changed the left side servo in mine. It is easy to get at for DIY.

 

[ukrsindicat]

Thank you. Would the broken servo also lead to not being able to change the reading on the climate control display?

 

[SocalSam]

Auto button means you have Limited. Try: Press Auto button to cycle between L R and Combined zones.

 

[ukrsindicat]

Auto button means you have Limited. Try: Press Auto button to cycle between L R and Combined zones.

Thank you. Any theories as to why my temperature setting is not changing despite pressing up and down buttons?