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5-Flashes Flame signal sensed out of proper sequence. 6-Flashes System Lockout. LED SECTION 8: Troubleshooting Guide. Ener-Radiant XL START Check Thermostat and Wiring. Is the power supply to unit 115V? Turn on thermostat Does blower turn on? Check door fit. If damaged, replace door. Remove door. Is voltage at door switch 115V? Depress switch. Does blower come on? Is blower side door in place? No Yes Yes Yes Yes No No No No Find the source of the electrical problem Check voltage to motor. Is it