Maytag Refrigerator Error Code Er: Communication Fault... | appliancefaults.com

Technical Background:

The 'Er' error code on a Maytag refrigerator indicates a communication failure between the Main Control Board and the User Interface (UI) Board. The Main Control Board controls the cooling system and other functions, while the UI Board provides the user interface for setting temperatures and other options. These two boards communicate via a serial communication link. The MCU logic expects constant communication. If communication is disrupted, the error is displayed. Voltage pathways are critical for board functionality. Loss of voltage prevents data transfer.

Symptoms:

The Maytag refrigerator displays the 'Er' error code on the control panel. The refrigerator may or may not be cooling, and some functions might be disabled. The UI may be unresponsive.

Possible Causes:

Main Control Board failure.
User Interface (UI) Board failure.
Wiring harness or connector issues between the Main Control Board and the UI Board.
Power supply problems affecting one or both boards.
Software Glitch requiring reset or update.

Solution:

1

Disconnect power to the refrigerator at the breaker panel.
2

Locate the Main Control Board (typically in the back of the refrigerator) and the User Interface (UI) Board (in the door).
3

Inspect the wiring harness and connectors between the two boards for any signs of damage (fraying, corrosion, loose connections). Reseat all connections.
4

Using a multimeter, verify 120V AC power is reaching the Main Control Board from the power supply. If not, troubleshoot the power supply.
5

Check the DC voltage (typically 5V DC or 12V DC) output from the Main Control Board to the UI Board. Consult the wiring diagram for the correct voltages.
6

If the voltage checks out, and connectors are secure, suspect a faulty Main Control Board or UI Board. Replacing the Main Control Board is often the first step.
7

After replacing either board, restore power and monitor the refrigerator for proper operation and error code clearance.

Safety Warning:

Disconnect power to the refrigerator at the breaker panel before performing any repairs. Always use proper Lock-Out/Tag-Out (LOTO) procedures. Be aware of high voltage present in the power supply and control board areas. Use insulated tools when working near electrical components.

Prevention:

Periodically inspect the refrigerator's wiring connections for any signs of damage or corrosion. Ensure the refrigerator is plugged into a dedicated, properly grounded outlet. Avoid overloading the circuit. Clean the refrigerator coils regularly (every 6 months) to prevent overheating, which can stress the electronic components.

Expert Tip:

Some Maytag refrigerators have a service mode that allows you to run diagnostic tests. To enter service mode, simultaneously press and hold the 'Freezer Temp' and 'Refrigerator Temp' buttons for 3-5 seconds. This may allow you to pinpoint which board is failing before replacement.

Frequently Asked Questions

•Where can I find the wiring diagram for my specific Maytag refrigerator model?

The wiring diagram is typically located on the back of the refrigerator or inside the control panel access cover. You can also find it online by searching for your model number and 'wiring diagram'.

•How do I know if the power supply is bad?

Use a multimeter to test the voltage output of the power supply. Refer to the wiring diagram for the correct voltage specifications. If the voltage is significantly lower or absent, the power supply is likely faulty.

•If I replace the Main Control Board, will I need to calibrate or program it?

Some Main Control Boards require programming or calibration after installation. Check the manufacturer's instructions for your specific model. You may need a special tool or software to perform this.

Maytag Refrigerator Error Code Er: Communication Fault Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where can I find the wiring diagram for my specific Maytag refrigerator model?

•How do I know if the power supply is bad?

•If I replace the Main Control Board, will I need to calibrate or program it?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: