Have GMV95 furnace that attemps to turn on, but circulating blower will not kick on. When heat is called for:
1) draft blower turns on.
2) burners ignite and heat up
3) circulatory blower does not start so gas is shut off when temp limit is reached.
4) four red flash code set.

Is there a way to test the blower motor after disconnecting from the circuit board so I don't harm the board? Is there anything else that could be bad other than the motor itself under this scenario?