GE Washer Error Code 71: Motor Communication Fault... | appliancefaults.com

Technical Background:

error code 71 on a GE washer indicates a communication failure between the main control board and the motor control unit (MCU). The MCU controls the motor speed and direction based on signals received from the main control board. This communication typically involves a low-voltage serial data line and a power supply line. The main control board sends commands, and the MCU reports back on motor status. A break in this communication link triggers the 71 error.

Symptoms:

The washer displays error code 71, the motor may not start or runs intermittently, and the washer may not complete its cycle. The control panel may appear unresponsive at times.

Possible Causes:

Faulty motor control unit (MCU)
Wiring harness issue between the main control board and MCU
Defective main control board
Motor winding failure causing MCU overload
Loose connections or corrosion at the MCU or main control board connectors
Voltage fluctuations on the incoming power supply

Solution:

1

Disconnect power to the washer at the breaker panel.
2

Locate the motor control unit (MCU), typically near the motor.
3

Inspect the wiring harness connecting the MCU to the main control board for any damage, loose connections, or corrosion.
4

Using a multimeter, check the voltage at the MCU power input. You should see approximately 120V AC.
5

Disconnect and reconnect the connectors at both the MCU and the main control board to ensure good contact.
6

If possible, with the power disconnected, check the motor windings for shorts to ground using a multimeter. Expect a high resistance reading.
7

If all wiring and connections appear good, replace the MCU. If the issue persists after MCU replacement, replace the main control board.

Safety Warning:

Always disconnect power to the appliance at the breaker panel before performing any repairs. This appliance operates at 120V AC, which can cause serious injury or death. Lock Out/Tag Out (LOTO) procedures should be followed to prevent accidental energization.

Prevention:

Periodically inspect the wiring harness for any signs of wear or damage. Ensure the washer is connected to a dedicated, properly grounded outlet to prevent voltage fluctuations. Avoid overloading the washer to prevent stress on the motor.

Expert Tip:

On some GE washer models, you can enter service mode by pressing and holding the Start button for 3 seconds, then pressing the Power button. This may allow you to run diagnostic tests on the motor and communication circuits.

Frequently Asked Questions

•What is the exact location of the MCU on my specific GE washer model?

The MCU is usually located near the motor, often mounted on the motor housing or nearby frame. Refer to the specific service manual or parts diagram for your model to pinpoint its exact location.

•How can I test the communication signal between the main control board and the MCU with a multimeter?

While you cannot directly test the digital communication signal with a standard multimeter, you can check for voltage on the communication lines. Consult the service manual for your specific model to identify the communication pins and expected voltage levels. A lack of voltage may indicate a broken wire or faulty control board.

•If replacing the main control board, do I need to program it, and how is this done?

Some GE main control boards require programming or configuration after replacement. This is usually done through a specific service mode or using a GE appliance programmer. Consult the service manual or a GE appliance technician for model-specific programming instructions.

GE Washer Error Code 71: Motor Communication Fault Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the exact location of the MCU on my specific GE washer model?

•How can I test the communication signal between the main control board and the MCU with a multimeter?

•If replacing the main control board, do I need to program it, and how is this done?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: