Heater not heating. I recently purchased this in very good shape.

What is your question?

Blower works, air conditioner get cool, lights change on cabin control unit. No heat when turned to a hot setting on the thermostat. This worked one time. Not since then

What makes this problem better or worse?

Has only worked once.

How long has your 2017 Ford F-250 Super Duty had this problem?

Purchased this in August