Typically your control board kicks on the furnace ignition system either a spark generator glow coil or pilot light after receiving a single from your thermostat that the temperature is too low.
Furnace blower control board.
Icm controls furnace fan blower circuit control board.
Use with compatible heating units and components available separately.
The r40403 003 blower control provides outputs for a 2 speed indoor blower motor and single speed inducer motor.
2 next last.
Furnace control boards these circuit boards are designed for controlling furnaces and heating units in hvac systems.
They can replace oem control boards in direct wire for wire replacement.
The armstrong r40403 003 blower control replaces all 40403 001 40403 002 and st9120a b or c blower controls.
Same day shipping order now and get same day shiping guarateed for assistance please call 1 877 733 9241.
If the furnace s draft inducer will not start or if the blower motor will not start then this could very well be a control board problem.
The control receives inputs from the thermostat w y and g pressure switch and high temperature limit switches.
I hope the youtube video below will help you troubleshoot your furnace s control board.