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Motor and Motor Control System Test
These tests check the machine controller power to the motor controller, the motor controller board, the
wiring connections between the control board and the drive motor, and the drive motor itself.
Machine Control Relay
1. Check for 120VAC on the power cord connection to the line filter. If no AC power is present,
replace the power cord.
2. Check for 120VAC on the line filter connection to the machine controller. If no AC power is
present, replace line filter.
3. Check for 120VAC to the control board. With the washer off but connected to the AC outlet,
measure the AC voltage between Pins 4 and 2 at connector P16.
• If 120VAC is present, continue with remaining Trouble Shooting Tests as needed.
• If voltage is not present, check circuit breaker or fuse box, power cord connection at outlet
and washer.
4. Set the probes of a volt-ohmmeter between P16-5 (BK/WH) and P16-1 (WH/BU) on the ma-
chine controller. Start the washer by pressing HEAVY DUTY and then START. Confirm that
120VAC is present when the relay clicks closed. Press STOP/CANCEL twice to stop the
cycle.
5. Set the probes of a volt-ohmmeter between P1-1 (BK/WH) and P1-2 (WH/BU) on the motor
controller. Start the washer by pressing HEAVY DUTY and then START. Confirm that 120VAC
is present when the relay clicks closed. Press STOP/CANCEL twice to stop the cycle.
Motor Controller
Check power to motor controller board:
• P1 of the motor control board should have 120VAC across its two terminals when the motor
controller is powered. Replace the control board if connector is broken.
Check link between machine controller and motor controller:
• With the power disconnected, check continuity between P4 of the machine controller and
P2 of the motor controller. Replace upper harness if open wire is found.
Check Fuse:
• With the power disconnected, check for an open fuse. The conformal coating may need to be
scratched away from the bare metal of the fuse.
• If fuse is open, replace the motor controller.