question for HVAC guys

We have a no heat problem...
First to detail this system... All electric, air handler in a closet setting, heat section on top, then blower, vaporator coil , return air underneath.
A/C condenser outdoors of course.
The condition...
Call for a/c and spark appears at thermostat mercury bulb ( normal ) condenser unit starts, blower in air handler does not.
Call for heat and absolutely nothing, not even the spark at bulb ( not normal ).
Call for fan only gets no response either.
Is most likely culprit blower motor failure ?
TIA