Speed Queen Washer Er, CO Error Code: What It Means & What to Check
Q: My Speed Queen washer is showing Er, CO. What does it mean, and what should I check?
A: On many Speed Queen washers, Er, CO indicates a drive board communication error. In plain English: the washer’s main control board isn’t communicating correctly with the motor/drive electronics (often called the drive board or inverter). When the controls can’t “talk” reliably, the washer may stop to prevent motor damage or unpredictable operation.
This is usually a service-level issue, but a few safe checks can sometimes clear a temporary glitch (especially after a power event).
What you might notice
- The washer stops and displays Er, CO
- The washer may not start, or may stop shortly after starting
- It may happen during agitation or spin (when the drive system is active)
- The error appears after a power flicker, outage, or surge
- Unusual sounds or the motor not responding normally (sometimes)
Safety first
- Motor-drive electronics can involve stored energy and higher voltages. Do not remove panels or attempt electrical testing.
- If you notice a burning smell, unusual heat, or repeated breaker/GFCI trips, stop using the washer and schedule service.
- Avoid repeated restarts—if the code returns quickly, it’s time to call for help.
Step-by-step quick checks (safe homeowner checks)
1) Power reset (most common first step)
- Press Power to stop the cycle.
- Unplug the washer for 2 minutes.
- Plug it back in and try a short cycle.
2) Confirm stable power to the washer
- Plug the washer directly into a proper wall outlet (no extension cords or power strips).
- If the outlet is loose or the plug feels wobbly, that can cause intermittent power that disrupts communication.
- If the code started after a storm or outage, wait a bit for power to stabilize before testing again.
3) Reduce load and retest
- If the washer was overloaded or badly unbalanced, remove some items and redistribute the load.
- Try a small test load on a standard cycle and see if the code returns.
4) Note the timing of the error
- Does it happen immediately when you press Start?
- Does it happen when the motor tries to ramp up for spin?
- Did it begin after a power event?
Those details help our friendly technicians in yellow pinpoint whether this is a connection issue, a drive board issue, or a control issue.
Common causes (and likely parts)
- Loose/damaged wiring harness or connector between the main control and drive board
- Drive board / inverter failure
- Main control board communication failure
- Power quality issue (flicker/surge) causing the boards to lose sync
Note: If Er, CO is repeatable, it usually requires diagnostic testing and repair.
When to call Beacon
If Er, CO comes back after a reset—especially if it repeats on a small load—it’s time to call our friendly technicians in yellow. We can check the control-to-drive communication, verify harness connections, and determine whether the drive board/inverter or the main control needs attention so your washer runs reliably again.
Request service online or call (352) 726-7530. You can also visit www.BeaconSaves.com.
Content Update & Editorial Review
Date: February 21, 2026
Reviewed by: Chris
Frequently Asked Questions
What is a “drive board” in a Speed Queen washer?
The drive board (often called an inverter) is the electronic module that controls the washer motor—especially motor speed changes during wash and spin.
Does Er, CO mean the motor is bad?
Not necessarily. Er, CO points to a communication problem between control electronics. The motor can be fine, but the boards (or wiring between them) aren’t communicating properly.
Will unplugging the washer fix Er, CO permanently?
A reset can clear a temporary glitch (often after a power event). If the issue is a failing board or a wiring/connector problem, the code will return until repaired.
Can a power flicker cause Er, CO?
Yes. A brief flicker or surge can interrupt communication and cause the controls to lose sync. If it becomes repeatable, it’s likely more than a one-time power event.
Why does it show up during spin?
Spin is a high-demand point where the drive system is most active. If communication is unstable, it often shows up when the washer tries to ramp up motor speed.
What should I tell Beacon when I call?
Tell us the code (Er, CO), when it happens (start vs spin), whether it began after a power event, and whether it repeats on small loads. That helps our friendly technicians in yellow diagnose faster.