Disconnect the wires that supply power to the motor with appropriate screwdrivers.
How to test a attic fan motor.
An infinite reading on the other hand may indicate an open motor winding.
Look for a resistance reading.
Once done test that the motor still works by.
How to test an attic fan motor.
This guide will hopefully make testing fan motors for you easy regardless of your experience level or type of fan motor that you are testing.
Step 3 test the connection between the thermostat and the power source.
Let the wires that run from the capacitor to the motor.
Step 2 test the thermostat.
Switch the analog volt meter from ohms to volts.
Create a parallel circuit by placing the leads on.
A reading of zero means the fan motor winding is likely shorted and causing the breaker to trip or blow.
If either of these conditions exists the fan motor needs to be replaced.
Step 1 test the fan motor.
How to test fan motor starting capacitors.