Why isn't my Empire heater blower working?
Have you read through the Owner's manual
Have you tried oiling it?

Oiling
The blower motor has an oil hole located on each end of the motor.
Use #20 motor oil only. It is best to oil the motor several times during
the heating season using 2 or 3 drops each time. If the motor fails
to start and hums, it could be a tight bearing due to lack of oil. This
may be corrected by pouring kerosene in the oil holes, allowing to
stand for a few hours and then oiling properly

Have you tried cleaning it?

Cleaning
The blower wheel will collect lint and could require cleaning once
a year. If the air output decreases or the noise level increases, it
indicates a dirty wheel. Complete removal of the wheel and scrubbing
it with a brush under flowing water is recommended

Are you waiting long enough?

Fan Control
The automatic fan control is located in the switch box. The switch
box is attached to the front of the blower assembly. The switch box
is adjacent to the combustion chamber. The fan control is a nonadjustable
automatic type. The fan control will require between
5 and 10 minutes of main burner operation before the fan control
“closes” and activates the blower. The blower will continue to run
between 5 and 10 minutes after the main burner shuts off, before
the fan control “opens” and deactivates the blower

Have you tried connecting the fan directly to power, to make sure it spins at all?