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Error code reference

Speed Queen Dryer Error Code SCI COMM ERROR

Communications problem between the front-end control and the output board; all outputs turned off.

Speed Queen codesSpeed Queen dryer codes

Communications problem between the front-end control and the output board; all outputs turned off.

First step from the service manual

Check connection between control and output board. Can also be caused by output board detecting a System Integrity Error.

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

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What SCI COMM ERROR means on a Speed Queen dryer

The SCI COMM ERROR on a Speed Queen dryer indicates a failure in serial communication between the front-end control board and the output board. These two boards work together continuously: the front-end control sends commands and the output board executes them by energizing components like the motor, heater, and drum light. When this communication link breaks down, the output board cannot safely receive instructions, so it shuts off all outputs as a protective measure. The dryer will stop functioning completely until communication is restored.

The most direct cause is a wiring or connector problem between the two boards. Loose, corroded, or damaged connectors on the communication harness are frequent culprits, and the first diagnostic step is always a thorough inspection of those connections. Beyond physical wiring issues, the error can also be triggered when the output board itself detects an internal System Integrity Error, meaning the output board has identified a fault in its own operation and is reporting that condition back through the communication link.

Diagnosing this code requires distinguishing between a harness or connector problem and an actual board failure. Start by inspecting and reseating the connectors at both the front-end control and the output board. If connections are secure and the error persists, the output board may be generating the underlying System Integrity Error that is propagating as an SCI COMM fault. In that scenario, board-level testing or replacement becomes necessary to resolve the condition.

Source: manufacturer service documentation.

Common causes of SCI COMM ERROR

  1. 01

    Loose or disconnected wiring harness connector

    Wiring / connection

    The connector linking the front-end control to the output board may have worked loose due to vibration. Inspect and firmly reseat all connectors at both boards to confirm a solid connection.

  2. 02

    Damaged or corroded communication harness

    Part replacement

    Wires in the communication harness can develop breaks, pinches, or corrosion at connector pins that interrupt the data signal. Visually inspect the harness for any damage and check pins for corrosion or pushed-back contacts.

  3. 03

    Output board System Integrity Error

    Part replacement

    The output board can detect an internal fault in its own operation and report it in a way that appears as an SCI COMM ERROR on the front-end control. If harness connections check out, the output board itself should be suspected.

  4. 04

    Faulty output board

    Part replacement

    The output board may have failed in a way that prevents it from maintaining communication with the front-end control. Board-level testing or substitution is needed to confirm this as the root cause.

  5. 05

    Faulty front-end control board

    Part replacement

    Less commonly, the front-end control board may be unable to send or receive communication signals correctly. This should be considered after the harness and output board have been ruled out.

See the test procedure for each cause

Frequently asked questions about SCI COMM ERROR

What does SCI COMM ERROR mean on a Speed Queen dryer?
SCI COMM ERROR means the front-end control board and the output board have lost serial communication with each other. As a safety response, the output board shuts off all outputs, including the motor and heater, so the dryer stops running. The fault can stem from a loose wiring connection between the two boards or from the output board detecting an internal System Integrity Error.
Will resetting my Speed Queen dryer clear the SCI COMM ERROR?
A power reset may temporarily clear the error if the communication disruption was caused by a momentary glitch, but the code will return if an underlying problem exists. If the connectors are loose or the output board has a recurring internal fault, resetting without addressing the root cause will not produce a lasting fix.
How do I fix an SCI COMM ERROR on a Speed Queen dryer?
Start by unplugging the dryer and inspecting the wiring harness that connects the front-end control to the output board. Reseat all connectors firmly and look for any damaged, corroded, or broken wires. If connections are secure and the error returns, the output board is likely generating a System Integrity Error internally and may need to be replaced. A technician can perform further board-level diagnostics if needed.
Is it safe to use my Speed Queen dryer when it shows an SCI COMM ERROR?
The dryer should not be operated while this error is active. The output board has intentionally shut off all outputs in response to the communication failure, meaning the dryer cannot run in a controlled manner. Attempting to bypass or ignore the fault without diagnosing it first is not advisable, as the root cause could involve a board fault.
How much does it cost to repair a Speed Queen dryer showing SCI COMM ERROR?
Repair costs vary depending on the cause. If only a harness connector needs reseating or a wiring repair is required, costs can be relatively low, generally in the range of $50 to $150 for a service call. If the output board requires replacement, parts plus labor typically fall in the range of $150 to $400 or more depending on your location and the specific board pricing at the time of repair.

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