Webwhat causes a soft lockout condition? No flame sense was detected after four ignition trials. Four flame failures during one call for heat. Turn off the 115 volt power supply to. The main control board regulates the power supply to all of the components of the furnace. If the control board. Webfeb 9, 2024 · ignition failure: If the furnace doesn’t ignite, ensure the gas valve is open and there’s a pilot light or ignition spark. No spark or pilot light could mean a faulty. Webjan 3, 2022 · ignition…