Brandon and Taylor wrote:Does it matter if I don't have a high limit switch?
You should have a L4064B Combination fan limit. It works differently on our furnace. If the Furnace plenum gets to the high limit temperature it disables the combustion fan and feed motor and sets the convection fan to high bypassing the coal trol. The other function it performs is the middle and lower switch control whether or not the fan is allowed to run based on the plenum temp. The coaltrol still controls the convection fan and speed but the fan is disabled till the plenum temp reaches what ever the middle pin is set for. Then it will again become disabled if the temp drops below the lower pin setting. All furnaces had the high limit. When did you buy it and where. You can PM me this info if you like.