98 Honda accord ac/heater control unit stops working after hour. Could it be a faulty unit?

98 Honda accord ac/heater control unit stops working after hour. Could it be a faulty unit?

Very poor description of the problem. What do you mean the "Unit" stop working after hour? What is not working? AC, heater, blower, not blowing cold or not blowing hot etc…

What's the "After hour" meant? What's the sub-model? 2.3L or 3.0L engine? Auto or manual HVAC system?