Speed Queen Washer-Extractor Error Code E d 32: Back EMF Error
E d 32 reports a back-EMF error on CHM1792C washer-extractors. The voltage the spinning motor feeds back to the drive differed from what the drive expected, so it stopped. Power down as the manual says, and call us if the code returns.
High: the drive stops and the machine cannot spin until the cause is fixed.
- Code
- E d 32
- Maker
- Speed Queen
- Equipment
- Washers
- Applies to
- CHM1792C family washer-extractor (QN models, 20-100 lb) front-end control
What does Speed Queen error code E d 32 mean?
A spinning motor generates a small voltage of its own, called back EMF, which travels back to the drive on the motor leads. The drive uses that voltage to know how fast and how smoothly the motor is turning, much like a speedometer. If the reading does not match what the drive expects for the speed it has commanded, it cannot trust its control, so it stops and shows E d 32 (display text: E d 32). The owner's manual points a technician at the drum and the motor harness, and at the motor or the drive board should the code persist. The possibilities it lists are a drum or motor that does not spin cleanly, a motor harness with a loose or damaged wire, a motor whose back voltage differs from the drive's reading, and a drive board that cannot read the motor feedback. The code is not about supply voltage or temperature. Keep customers away from the machine while it shows the code.
Affected models and control systems
Speed Queen CHM1792C family washer-extractors (QN models, 20-100 lb) with the front-end control. Other washer-extractor families, such as CHM495R, list different codes.
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
- E d 32 on the display
- The motor stutters or stops as it speeds up
- The load stays in the drum
Possible causes
Listed in Speed Queen's documentation
- Drum or motor that does not spin cleanly
- Motor harness with a loose or damaged wire
- Motor whose back voltage differs from the drive's reading
- Drive board that cannot read the motor feedback
Other likely causes — what usually sits behind error code E d 32 on this control. A technician confirms which one it is before any part is replaced.
- A motor lead with a hairline break that opens only while it vibrates
- A bearing that makes the drum run unevenly at certain speeds
Safe checks before calling for service
- Power down the machine, as the owner's manual says for drive codes.
- Let the lock release before the door is opened.
- Leave the cabinet closed.
- If the code returns, ask us to come out and keep customers away from the machine meanwhile.
How a technician diagnoses error code E d 32
- Read E d 32 and note the speed at which it trips.
- Turn the basket by hand with power locked out to check for roughness.
- Check the motor harness and its connectors along the run.
- Measure motor winding resistance and compare phases.
- Replace the motor or drive board only after the harness and drum are cleared.
- Back EMF is a live signal on the motor leads, and testing it needs the drive powered and the cabinet open.
- Intermittent harness breaks show up only with the machine running.
- Telling a motor mismatch from a drive reading problem needs the right comparison data.
How error code E d 32 differs from similar codes
E d 32 concerns the motor's feedback signal; E d 21 concerns the drive's DC bus.
Technical reference
- Document
- Washer-Extractor Programming CHM1792C_SVG, Part No. F8641001ENR4, Error Codes Table 29 (pp. 100-107)
- Edition
- Part No. F8641001ENR4, January 2020
- Models / control
- CHM1792C family washer-extractor (QN models, 20-100 lb) front-end control
- Section
- Error Codes, Table 29, pp. 100-108 (PDF pages equal printed pages)
- 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
What is back EMF?
It is the voltage a spinning motor feeds back to the drive.
Could an unbalanced load cause E d 32?
The manual lists the drum and motor, not the load, so a clean drum check is the first step.
Will a power-down clear it?
It clears the display; if the cause is still there, the code returns.
Need help with Speed Queen error code E d 32?
A technician confirms the cause on site and gives you the price in writing before any work starts.