Homeowner stated furnace would kick flame on but cut out two seconds later. Homeowner stated he pulled and cleaned flame sensor. Also stated furnace kicked a fault code of 45. Looked up code and it states circuitry lockout. It said to check gas valve to make sure the relay wasn’t stuck open, also check flame sense. Checked both and had no issues. The code also states if code persists after multiple restarts to replace control board. Talked with Jake with gluon tech support and he also deemed it a faulty control board. All recommendations declined at this time. Homeowner will follow up tomorrow if he wants to move forward with repair.