1.5 year old unit. Blower fan not coming on. Tested in A/C, heat & fan only and blower fan does not engage. T-stat appear okay - jumped fan wires and nothing. Compressor and compressor fan come in both heat and cold, but still no fan.

The X-13 motor is new to me as there is no external fan rely, so is it possible the defrost board is bad? Can abad defrost board cause the fan not to come on?

It was 90 degrees outside & I was surprised to feel that the blower motor was actually cold to the touch. I know the fan has an internal thermostat control... the coils are not frozen either.