We have a carrier heater and the blower motor won't come on. The burners will come on and after a few minutes they go off;limit switch I assume. Have replaced the blower motor, capacitor and the circit board. Could the ignitor box, the box with the orange wire be the problem?

You should check and see if there is a blower motor control separate from the circuit board on your unit. Here is also something you can try. Turn the blower motor control on the thermostat from auto to on. If all else is OK with the blower motor power circuit in the furnace the blower should come on and stay on until the switch is moved back to auto. Most units have the blower switch on the thermostat especially if A/C is also installed.