not quite. Lol.
Both of the LEDs are the indicators.
I do see on all the other knob buttons, there are 2 LEDs; one for the picture and one for the light, but this is NOT the case with the heaters. I'm not honestly sure where the picture gets it's light from, though I'm guessing it's from the other surrounding LEDs.
Pictures below just show both of the LEDs working when buttons are reinstalled.