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
- Turn off and unplug the washer from the power source.
- Wait 5–10 minutes to allow any transient electronic faults to clear.
- Plug the washer back in and power it on to see if the CO error clears.
- 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
- Disconnect power and open the control panel to access the machine’s control boards.
- Inspect harnesses and connectors between the Front End Control (FEC) and Machine ID/Output Control (MIC) for damage, corrosion, or looseness.
- Secure or replace damaged wiring harnesses or connectors as needed.
- Test control boards and communication signals with diagnostic tools.
- 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
- 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.
Next step
Choose the next step for CO
Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.
Most relevant component to inspect
Wiring Harness
Connects controls, sensors, motors, and other electrical components inside the appliance.
- Typical part-only price
- $20 - $120
- DIY difficulty
- Medium
- Estimated time
- 30-90 mins
Where can I find the model number?
Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.
Verify the complete model and part number on the retailer's compatibility page before ordering.
Other parts options
Check related components first; use model search as a fallback.
Main Control Board
The central brain of the appliance that controls all components, cycles, and timings.
Model-compatible Washing Machine parts
Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. We may earn a commission from other qualifying purchases or service requests made through links on this page, at no additional cost to you. Recommendations are based on repair relevance, not commission rate.
Optional routine care
Maintenance supplies
These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.
Washing Machine Cleaner Tablets
Routine tub-cleaning supplies for residue and odor control. They do not repair a mechanical, drainage, or electronic fault.
Braided Washer Inlet Hoses
A maintenance replacement option for visibly worn external fill hoses. Verify thread size, length, and hot/cold connection requirements.
Washer Drain Hose Holder
Helps secure an external drain hose at the standpipe. It does not correct an internal pump or control fault.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.
Technical Specifications
| note | The previous model-independent part specification was removed. Verify the full model number and diagnosis in the manufacturer's official parts catalog before ordering. |
|---|---|
| part_number | None |
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: 2026-07-31
User Comments (0)
Share your experience or solution below.
Please login to post a comment.
Be the first to comment!