Speed Queen CHM495R Washer Error Code Ed10: Low DC Bus Notice
Ed10 on a Design 2 or 3 CHM495R washer-extractor is a low DC bus notice: the internal power line feeding the motor sagged below its normal level. The cycle goes on. Note when it shows, and call us if it happens often.
Low: a notice, since the cycle continues and no action is needed unless it repeats.
- Code
- Ed10
- Maker
- Speed Queen
- Equipment
- Washers
- Applies to
- CHM495R family washer-extractor front-end control (20-100 lb)
What does Speed Queen error code Ed10 mean?
The motor drive keeps an internal DC line, the DC bus, at a steady level. Ed10 appears when that line sags below normal. Unlike most Ed codes, this one is a notice. The cycle goes on and no input is needed from you, so the machine keeps washing. A sag that repeats often points at the building supply or a loose connection, and it is worth reporting to us. The causes the manual gives are supply voltage that sags at the washer, loose connections at the incoming supply terminals, and a drive board that misreads the bus voltage. Notes about when it happens carry real information. If it appears when other machines start, or when lights dim, the building supply is the likely cause. If it appears at random with nothing else changing, a loose terminal or the drive board moves up the list. This notice belongs to Design 2 and 3 models. Its high-side counterpart, Ed02, does stop the machine.
Affected models and control systems
This page covers Design 2 and Design 3 machines of the CHM495R family washer-extractor front-end control. Ed02 is the high-side bus error that does stop the machine.
Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.
What you may notice
- Ed10 flashes while the cycle keeps running
- The machine runs normally otherwise
- Lights or other machines may dim at the same time
Possible causes
Listed in Speed Queen's documentation
- Supply voltage that sags at the washer
- Loose connections at the incoming supply terminals
- A drive board that misreads the bus voltage
Other likely causes — what usually sits behind error code Ed10 on this control. A technician confirms which one it is before any part is replaced.
- A shared circuit that also feeds a large dryer, which pulls the voltage down when it starts
- A terminal that has loosened from heating and cooling over years of use
Safe checks before calling for service
- Let the cycle continue; no action is needed for the code itself.
- Make a note of when it shows and whether lights or other machines also dip.
- Leave the cabinet closed.
- If it shows often, call us to arrange a visit and share your notes.
How a technician diagnoses error code Ed10
- Read the code and review the operator's notes on when it appears.
- Measure the supply voltage at the machine during a cycle and when nearby equipment starts.
- Check the incoming terminals for tightness and heat marks.
- Compare the drive's bus reading with a known supply.
- Replace the drive board only after the supply and terminals test good.
- Tightening incoming terminals is live-voltage work and needs lockout by a licensed technician.
- Voltage sag may come from the building's electrical service, which is beyond the washer.
- A drive board that misreads the bus can only be proved by comparing it with a measured value.
How error code Ed10 differs from similar codes
Ed02 is the high bus error that stops the machine; Ed10 is a low bus notice that lets it continue.
Technical reference
- Document
- Washer-Extractor Programming CHM495R_SVG, Part No. F8208501ENR10, March 2017, Error Codes (pp. 36-37)
- Edition
- Part No. F8208501ENR10, March 2017
- Models / control
- CHM495R family washer-extractor front-end control (20-100 lb)
- Section
- Error Codes table, pp. 36-37 (E Pr only on Design 1 models; Ed01-Ed11 on Design 2 and 3 models)
- Checked
- October 2026
We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.
Related Speed Queen washer error codes
Do I need to stop the machine for Ed10?
No. The cycle goes on and no input is needed from you.
Why does it matter if it keeps running?
A repeating sag can mean a loose connection or a weak supply that gets worse.
Is Ed10 the same as Ed02?
No. Ed02 is a high bus that stops the machine; Ed10 is a low bus notice.
Need help with Speed Queen error code Ed10?
A technician confirms the cause on site and gives you the price in writing before any work starts.