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Error code reference

Maytag Refrigerator Error Code Error

Open communication link between high volt board and low volt board.

Maytag codesMaytag refrigerator codes

Open communication link between high volt board and low volt board.

First step from the service manual

Check voltage readings across JP4 connector pins 2 to 4 (should be 4-5 VDC) and pins 1 to 3 (should be 18-24 VDC) on Low Volt Board.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What Error means on a Maytag refrigerator

This error code indicates an open or broken communication link between the high voltage board and the low voltage board in a Maytag refrigerator. These two control boards work in tandem: the high voltage board manages power delivery to major components such as the compressor and fans, while the low voltage board handles logic, user interface signals, and sensor data. When the communication pathway between them is interrupted, the refrigerator's control system cannot coordinate operations correctly, and this error is triggered.

The first diagnostic step focuses on the JP4 connector on the low voltage board. Technicians should measure voltage between pins 2 and 4, which should read 4 to 5 VDC, and between pins 1 and 3, which should read 18 to 24 VDC. Readings outside these ranges point to either a loss of power supply to the low voltage board, a failed high voltage board that is not delivering the correct output, or a wiring fault between the two boards. Correct voltage at both pin sets with the error still present can indicate a failed low voltage board that is not properly receiving or interpreting the signal.

Common root causes include damaged wiring harnesses connecting the two boards, loose or corroded connector pins at JP4, a failed high voltage board that is not producing the required supply voltages, or a failed low voltage board. Physical inspection of the harness for pinched, burned, or broken wires should accompany the voltage measurements to fully isolate the fault.

Source: manufacturer service documentation.

Common causes of Error

  1. 01

    Loose or corroded JP4 connector

    Wiring / connection

    The JP4 connector on the low voltage board can develop loose pins or corrosion over time, interrupting the communication signal. Inspect the connector for discoloration, bent pins, or a loose fit and reseat it firmly.

  2. 02

    Damaged wiring harness between boards

    Part replacement

    The wiring harness connecting the high voltage board to the low voltage board can become pinched, chafed, or broken, especially near mounting brackets or sharp edges. Visually trace the harness and check for any visible damage.

  3. 03

    Failed high voltage board

    Part replacement

    If voltage at JP4 pins 1 to 3 measures outside the 18 to 24 VDC range, the high voltage board is not supplying the correct power to the low voltage board. A failed high voltage board will need replacement.

  4. 04

    Failed low voltage board

    Part replacement

    If the JP4 connector and wiring check out and both voltage readings are within spec, the low voltage board itself may have failed and is not processing the incoming communication signal correctly. Replacement of the low voltage board would be required.

  5. 05

    Incorrect supply voltage at JP4 pins 2 to 4

    Part replacement

    A reading below 4 VDC or above 5 VDC at JP4 pins 2 to 4 indicates the logic supply is out of range, which can prevent communication from being established even if the harness appears intact. This points to a board-level power supply fault.

See the test procedure for each cause

Frequently asked questions about Error

What does Error mean on a Maytag refrigerator?
This error indicates that the communication link between the high voltage board and the low voltage board has been broken or interrupted. The two boards must exchange signals continuously for the refrigerator to operate correctly. When that link is open, the control system flags the fault and the refrigerator may stop functioning normally. Diagnosis involves checking specific voltage readings at the JP4 connector on the low voltage board.
Can I fix this error myself, or do I need a technician?
A knowledgeable DIYer comfortable with a multimeter can start by inspecting the JP4 connector and the wiring harness for visible damage and by measuring the voltages at pins 2 to 4 (4 to 5 VDC) and pins 1 to 3 (18 to 24 VDC). However, if a control board needs replacement, the repair becomes more involved and a technician is recommended to ensure the correct board is identified and installed safely.
Is it safe to keep using my refrigerator while this error is displayed?
With this error active, the refrigerator's control boards are not communicating properly, which means cooling and compressor operation may be unreliable or completely stopped. Food safety is at risk if the temperature inside rises. It is best to address the error promptly and avoid relying on the refrigerator until the fault is resolved.
Will resetting the refrigerator clear this error?
A power reset may temporarily clear the error display, but if the underlying cause such as a wiring fault or failed board is still present, the error will return. Resetting without diagnosing the root cause is not a reliable fix, and the communication fault will continue to affect refrigerator operation.
How much does it cost to repair this error on a Maytag refrigerator?
Repair costs depend on which component has failed. If only the wiring harness or connector needs attention, costs are generally lower, typically in the range of $100 to $250 including labor. If a control board requires replacement, costs can range from $200 to $500 or more depending on the specific board, part availability, and local labor rates.

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