Auto Air Conditioning & Heater Repair: ac/heater, blower fan, climate control

Question
I have no power to ac/heater on a 2009 Honda Civic, it was working fine and suddenly it just turned off. What would it be ?

Answer
Hello
I need a little bit more information please.
What is it that stops working, the fan, the air conditioning or,if you have climate control, is the display panel going blank ?

If its the blower fan will it work on maximum ?

Thanks & let me know