This disclosure relates to a pneumatic control system for a clothes dryer wherein the flow of fuel to the main burner means is pneumatically controlled in such a manner that the ignition means for the main burner means must be first pneumatically actuated before the pneumatic control system will pneumatically open the fuel supply means to the main burner means, the control system including a pneumatically operated logic ''''memory'''' unit to assure that the ignition means is always pneumatically operated before the main burner can be pneumatically operated to its on condition by a pneumatically operated NAND unit each time there is a requirement to turn on the main burner means. The ''''memory'''' unit is prevented from transmitting atmosphere therethrough when being switched by its setting signal.