Upon arrival, thermostat was in off mode. Turned on heating to do a run test. Inducer kicks on, ignitor comes on and then gas valve opens and ignition is successful. After 30 seconds, the blower relay on the control board clicks, but blower does not come on. After further investigation, found that control board is not powering the blower motor. Once board is removed, found that solder joint on back of the board that connects the blower relay to the blower has been burned off. Replace failed control board with new universal White Roger's 50M56U-843 control board. Run test to ensure all modes operate properly. System is operational at this time.