2003 Ford F150 Temperature/Heater Controls

Thank you for your help.
The heater controls on my 2003 F150 Supercrew have recently malfunctioned. They are the Auto controls with the push button sets. Any set I select causes the air to come out the defrost ducts in auto or manual. The only way I can get it off the defrost is to put it on the vent setting. I am not sure if there is a fuse or some other reset.

Thanks in advance for your help.

Cory