2017 peterbuilt 579 vents not blowing air, defrost barely on

Hi,
2017 peterbuilt 579 vin HD423757 vents not blowing air. defrost barely blowing air to the windshield.
my vent controls are not working either. Nothing happens when turning knobs

any suggestions?
Thank you in advance for your help

 

Thank you fast reply’s but I didn’t have to take the truck to the shop or look around the fuse box this time.
im suspecting the truck was just cold and actuator or some parts were frozen and caused the blower not to activate.
The truck was in snow conditions for about 12 hours and not running. After I ran the trucks for 8 hours while sleeping/freezing I resoaetrf the truck and blower started to work. Horray. Really glad it worked out with pit paying for the fix.
ty again

on side Question
My bunker floor is always soaked after running in showers for couple hours.
I removed all pads on the floor and try to find traces of water coming in but nothing showering, I can see that the water is collection where the cab and sleeper connect and prob starts somewhere in the back of the truck. Seals on windows and door are perfect, seal between sleeper and cab is fine.
I do have a heather system with a fan installed in the back of the cab with two vents there but theirs a seal that’s covering those vents. Look fine.

any suggestions ?

 

Sleeper boot between the cab and sleeper ?

 

I’ll be back In The truck on Sunday and will take some photos. Their is a rubber boot between day cab and sleep (step) and it’s in Perfect condition.