civic climate control....????

it's possible that my climate control is broken...coz this morning when I got out of the house to go to school...i turned on the Heater but it only coming out cold air...i havent been using the heater in a few months but my last climate control which i replaced a month ago (bought the climate control on Ebay), the heater work jz fine when i tested few months ago. It is possible that my climate control is broken??? ohhh, and the lighting in the climate control doesnt light up at night as well...the only thing that light up is the button when i press it...plz let me know, so i can order a new one.