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ACTUATOR MOTOR ELECTRICAL TESTS
The following tests are for troubleshooting the actuator motor and related circuits:
Use an AC voltmeter set for the proper range. Voltages in the tables are measure across the
motor reversing capacitor (between the colored motor lead wires.
If there is no ice in the evaporator(s) and the water plate(s) is (are) not fully closed (with the water
plate switch(es) pushed up and the “ARMS UP” LED on), the actuator motor(s) and pump(s)
should be running. If not, be sure there is power to the motor(s) and also that the motor(s) is(are)
not overheated and off due high temperature. Allow the motor to cool down before starting the
test procedure.
Always refer to the proper wiring diagram when troubleshooting.
Motor winding resistances at 75˚ F (24˚ C) out of the circuit are as follows:
REX 115 volt motors, white to black or yellow, approximately 95 ohms
REX 230 volt motors, white to red or yellow, approximately 400 ohms
Voltages for Actuator Motor Electrical Tests
Actuator Motor Test Parameters
115 volt motors, reads 180-240 or
230 volt motors, reads 290-370
Tap gear case to align
bearings
Line voltage for any voltage motor
Line voltage for any voltage motor
in one actuator switch position and
0 volts in the other position
115 volt motors, reads 180-240 or
230 volt motors, reads 290-370
in one actuator switch position and
0 volts in the other position
0 volts in both actuator switch
positions. Be sure there is power to
the motor (line voltage) by leaving
one probe on either capacitor lead
and placing the other probe on the
white motor lead.
Disconnect the actuator
motor from the circuit and
test the winding resistance.
If approximately 500 ohms
from white to red or yellow,
replace the capacitor. If the
resistance is erratic, replace
the motor.
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