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Error code reference

Continental Washer Error Code COM

Communication failure between microprocessor and inverter, inverter displays Er8.

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Communication failure between microprocessor and inverter, inverter displays Er8.

First step from the service manual

Remove the communication cable at micro position X-14 and set meter for DC voltage to verify the micro is producing the 5 VDC required to communicate.

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

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What COM means on a Continental washer

The COM error code on a Continental washer indicates a communication failure between the main microprocessor control board and the inverter drive board. When this fault is active, the inverter will display Er8 as a secondary indicator of the same underlying problem. The two boards rely on a dedicated communication cable to exchange control signals, and when that link is disrupted or the required voltage is absent, the washer cannot regulate motor speed or direction and will halt operation.

The microprocessor must supply 5 VDC through the communication cable to establish and maintain the data link with the inverter. The first diagnostic step is to disconnect the communication cable at micro connector position X-14 and use a multimeter set to DC voltage to measure whether the micro is producing that 5 VDC output. If the voltage is absent at X-14, the microprocessor board itself is likely faulty. If 5 VDC is present at the micro side but the COM error persists when reconnected, the fault is either in the cable, the connector pins, or the inverter board's ability to receive and respond to that signal.

Common causes include a damaged or unseated communication cable, corroded or bent connector pins at X-14 or the inverter side, a failed microprocessor control board, or a failed inverter board. Because both boards must be functional for communication to succeed, systematic voltage testing at the cable connectors is essential before condemning either board.

Source: manufacturer service documentation.

Common causes of COM

  1. 01

    Loose or disconnected communication cable

    Wiring / connection

    The cable connecting the microprocessor at connector X-14 to the inverter board can work loose over time from vibration. Inspect both ends of the cable for secure seating and reseat any loose connectors before further testing.

  2. 02

    Damaged communication cable

    Part replacement

    The cable itself may have broken wires, pinched insulation, or internal opens caused by repeated machine vibration or physical damage during installation. Check the full length of the cable for visible damage and test continuity across each wire.

  3. 03

    Corroded or damaged connector pins

    Wiring / connection

    Pins at connector X-14 on the microprocessor or at the inverter board connector can become corroded, bent, or backed out of the housing, preventing reliable electrical contact. Inspect pins visually and clean or re-tension any that appear compromised.

  4. 04

    Failed microprocessor control board

    Part replacement

    If the DC voltage measurement at connector X-14 shows less than 5 VDC or no voltage at all with the cable disconnected, the microprocessor board is not producing the signal required for communication and will need replacement.

  5. 05

    Failed inverter board

    Part replacement

    If 5 VDC is confirmed at the microprocessor side of the cable and the cable and connectors test good, the inverter board may be unable to receive or process the communication signal. The Er8 code on the inverter display supports this as a possible origin point of the fault.

See the test procedure for each cause

Frequently asked questions about COM

What does COM mean on a Continental washer?
The COM error code means the main microprocessor control board and the inverter drive board have lost communication with each other. The inverter will simultaneously display Er8 as a companion fault code. The communication link depends on a dedicated cable and a 5 VDC signal from the microprocessor. Without it, the washer cannot control the motor and will stop operating.
Can I fix the COM error on my Continental washer myself?
Some causes of the COM error, such as a loose communication cable, can be addressed without special tools by inspecting and reseating the connector at microprocessor position X-14 and at the inverter board. However, diagnosing whether the microprocessor or inverter board has failed requires a multimeter and comfort working around live electrical circuits. If you are not experienced with appliance electrical diagnostics, a qualified technician should perform the voltage testing and any board replacement.
Is it safe to keep using my washer when the COM error is displayed?
No. When the COM error is active, the washer cannot properly communicate between its control board and motor drive system, which means motor speed and direction cannot be reliably regulated. Operating the machine in this condition risks further damage to the inverter or control board. The washer should remain out of service until the fault is diagnosed and corrected.
How much does it cost to repair a COM error on a Continental washer?
Repair costs vary depending on the failed component. Replacing the communication cable is typically the least expensive fix, generally in the range of a service call fee plus a low-cost part. Replacing the microprocessor control board or the inverter board is more involved, with parts and labor costs typically ranging from $150 to $400 or more depending on parts availability and local labor rates. Getting a firm diagnosis before ordering parts will prevent unnecessary expense.
Will resetting the washer clear the COM error code?
A power reset may temporarily clear the COM error code from the display, but if the underlying fault with the communication cable, connector, microprocessor, or inverter board still exists, the error will return as soon as the washer attempts to operate. A reset alone is not a repair. The 5 VDC signal at connector X-14 and the condition of the communication cable must be verified to permanently resolve the fault.

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