My Harman isn't putting out much heat. The ESP light is on (3 blinks) and the fan is now on full speed. Even if I move the knob it remains on full speed. This is a repeat of yesterday. If I turn it off and unplug it, it clears the code. It ran most of yesterday on 1, it turned it up to 4 last night and this morning, it was blinking again. Again putting out minimum heat. I'm going to replace it today any way. Just checking to see if it's the right solution based on symptoms.