did you check the ceiling above the unit for a “firematic” switch. they look like the old style round light switches form the knob and tube days, but they actualy melt inturnaly and pop out the center to disconnect the power incase of a fire. i’ve seen them on every furnace around here. plus there’s some times a rugular looking light switch on the furnace above the burner that’s called a “service shut off”, for when someone is working on it. the one in the other room is correct, and should have a red cover indicating that it not for a light, but for the furnace. i call 'em out if they don’t.