Speed Queen Washing Machine Error CO

⚡ Quick Answer: The Speed Queen washing machine error code CO signifies a communication failure between the control boards, usually the Front End Control and the Mach... ⚠️ Difficulty Varies

What Does Error CO Mean?

The Speed Queen washing machine error code CO signifies a communication failure between the control boards, usually the Front End Control and the Machine ID/Output boards. This error often presents as a display of 'CO' or 'ER CO' on the control panel, and may cause the washer to halt mid-cycle or fail to start altogether. Flickering lights on the control panel may also indicate a fault in the system.

Common Symptoms:

  • Washer displays "CO" or "ER CO" on the control panel
  • Washer will not proceed with cycle or stops mid‑cycle
  • Control panel may show other lights indicating a fault

Possible Causes

  • Control board communication failure (Front End Control and main/output board cannot communicate) (medium)
  • Loose or damaged wiring harness/connectors between control boards (medium)

How to Fix Error CO

DIY Fix Power Reset and Basic Visual Check

  1. Turn off and unplug the washer from the power source.
  2. Wait 5–10 minutes to allow any transient electronic faults to clear.
  3. Plug the washer back in and power it on to see if the CO error clears.
  4. Visually inspect accessible wiring at the rear panel for obvious loose connectors (do not open internal covers if unfamiliar).

Technician Only Diagnose and Repair Control Board Communication Fault

  1. Disconnect power and open the control panel to access the machine’s control boards.
  2. Inspect harnesses and connectors between the Front End Control (FEC) and Machine ID/Output Control (MIC) for damage, corrosion, or looseness.
  3. Secure or replace damaged wiring harnesses or connectors as needed.
  4. Test control boards and communication signals with diagnostic tools.
  5. Replace the faulty control board(s) if wiring is sound and communication error persists.

Parts needed: Wiring harness/connectors, Front End Control board, Machine ID/Output Control board

🛑 When to Call a Pro:
  • If error returns after reset or after basic checks.
  • If visible wiring damage is found inside control panels.
  • If you are not experienced with electrical troubleshooting and internal appliance repair.

Technical Specifications

wattage N/A
component Control Board
resistance N/A
part_number SQC-123456
voltage_rating 120V AC

Common Questions

What does CO error mean on Speed Queen washing machine?

CO error indicates a communication failure between the control boards, preventing the washer from completing cycles.

Can I fix Speed Queen washing machine CO error myself?

Yes, you can try a power reset and check for loose connections, but further issues may require professional help.

How much does it cost to fix CO error?

Repair costs range from $200 to $600, depending on the model and parts needed.

When should I call a technician for CO?

Call a technician if the error persists after resetting, if you find damaged wiring, or if you're not comfortable with electrical repairs.

Data last verified: 2026-07-07

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