[ctuna]

Try pressing the + fan button(turning the fan up)
or rotating one of the heater controls.
You can turn the heater control completely off by turning the fan
down all the way.(which means all the display lights on the panel are off)
I thought I had broke my heater controls when I disconnected the
battery and it looked dead turning up the fan brought it back .
It works that way, I sometimes turn it off if the inside temp is right.