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Error code reference

Speed Queen Dryer Error Code ICM COMM ERROR

Output board failed to communicate with the ignition control module (ICM); control turns off all outputs.

Speed Queen codesSpeed Queen dryer codes

Output board failed to communicate with the ignition control module (ICM); control turns off all outputs.

First step from the service manual

Control allows IO board to clear error 3 times before entering Machine Error Mode. Clear by powering down, pressing Clear Fatal Error keys, or sending Clear Fatal Error network command.

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

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What ICM COMM ERROR means on a Speed Queen dryer

The ICM COMM ERROR on a Speed Queen dryer indicates that the output (IO) board has lost communication with the ignition control module, commonly referred to as the ICM. The ICM is responsible for managing the gas ignition sequence in gas dryer models, and the IO board must maintain a continuous communication link with it during operation. When this link fails or is interrupted, the control system detects the breakdown and immediately shuts off all outputs as a protective measure to prevent unsafe operating conditions.

This communication failure can stem from several sources: a faulty wiring harness or connector between the IO board and the ICM, a failed ICM, a failed IO board, or electrical interference disrupting the signal. Loose or corroded connectors at either end of the communication circuit are among the most common physical causes. In some cases, a transient power fluctuation or voltage spike can trigger the error without any permanent component failure.

The control system includes a built-in recovery allowance before locking out completely. It will permit the IO board to clear the error up to three times before entering Machine Error Mode, which requires deliberate intervention to reset. Clearing can be accomplished by powering the unit down completely, pressing the designated Clear Fatal Error key sequence on the control panel, or issuing a Clear Fatal Error command over the network in commercial installations. If the error returns after three clearing attempts, a deeper diagnostic of the ICM, wiring, and IO board is necessary.

Source: manufacturer service documentation.

Common causes of ICM COMM ERROR

  1. 01

    Loose or corroded wiring connector

    Wiring / connection

    A loose, corroded, or damaged connector between the IO board and the ignition control module is the most frequent cause of this communication failure. Inspect all connectors in the ICM communication circuit for corrosion, bent pins, or incomplete seating.

  2. 02

    Damaged wiring harness

    Part replacement

    A wire in the harness linking the IO board to the ICM may be broken, pinched, or shorted. Visually trace the harness and use a multimeter to check for continuity breaks or shorts to ground.

  3. 03

    Failed ignition control module (ICM)

    Part replacement

    The ICM itself may have failed internally, preventing it from responding to the IO board. If wiring and connectors check out, the ICM is the next component to test or replace.

  4. 04

    Failed IO board

    Part replacement

    The output board may be unable to properly transmit or receive the communication signal to or from the ICM. If the ICM and wiring are confirmed good, the IO board should be evaluated for replacement.

  5. 05

    Transient power disturbance

    Wiring / connection

    A brief voltage spike or power interruption can disrupt the communication signal and trigger this error without causing permanent hardware damage. If the error clears after a power cycle and does not return, a one-time power event was likely the cause.

See the test procedure for each cause

Frequently asked questions about ICM COMM ERROR

What does ICM COMM ERROR mean on a Speed Queen dryer?
It means the output board (IO board) failed to communicate with the ignition control module (ICM), the component that manages gas ignition. When this communication breakdown is detected, the control shuts off all outputs as a safety measure. The dryer will allow up to three reset attempts before locking into Machine Error Mode, which requires a deliberate reset procedure to exit.
Can I reset the ICM COMM ERROR myself on a Speed Queen dryer?
Yes, you can attempt a reset by powering the dryer down completely, pressing the Clear Fatal Error key combination on the control panel, or sending a Clear Fatal Error network command on commercial units. The control allows up to three self-clearing attempts before entering Machine Error Mode. If the error returns after three resets, a technician should inspect the ICM, wiring harness, and IO board before further use.
Is it safe to use my Speed Queen dryer when the ICM COMM ERROR is showing?
No, you should not attempt to operate the dryer while this error is active. The control intentionally shuts off all outputs when the error occurs, and continuing to force operation without resolving the underlying cause could create an unsafe ignition condition in a gas dryer. Have the communication circuit between the IO board and the ICM inspected before resuming use.
What does it cost to fix an ICM COMM ERROR on a Speed Queen dryer?
Repair costs vary depending on the root cause. If the fix is simply reseating a loose connector, costs may be limited to a service call fee, typically in the range of $75 to $150. Replacing the ignition control module or the IO board will add parts costs, with total repairs generally ranging from $150 to $400 or more depending on labor rates and parts pricing in your area.
Will the ICM COMM ERROR clear on its own after the dryer is unplugged?
Powering down the dryer is one of the three accepted methods to clear this error, so unplugging the unit may allow it to reset temporarily. However, if the underlying cause is a hardware failure in the ICM, IO board, or wiring, the error will return once the dryer is restarted. Repeated returns of the error after power cycling indicate a component or wiring problem that must be repaired.

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