Speed Queen Washer Error Code Eio 31: Door Lock Pulse Pin
Eio 31 on a CHM1792C washer-extractor reports a failure of the door lock solenoid pulse pin. The check on the line that pulls the lock in did not pass, so the machine cannot count on locking the door and stops. Let the lock release, leave a sign on it, and call us.
High: the lock cannot be confirmed, and the machine will not run until the cause is fixed.
- Code
- Eio 31
- 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 Eio 31 mean?
The door lock solenoid in a CHM1792C washer-extractor does not simply switch on. The input and output board first sends a short pulse that pulls the lock in firmly, then settles into a holding state. The control checks the line that carries this pulse. Eio 31 means that check did not pass. With the pulse in doubt, the machine cannot count on the door locking, and a washer-extractor must not spin with the lock uncertain, so it stops and the code stays on the display. The manual lists the board output for the lock pulse, the lock solenoid wiring and plug, and the input and output board itself. It does not point at water level, load or balance. The result is a machine that refuses to continue and may leave the door either locked or unlocked, depending on when the stop happened.
Affected models and control systems
CHM1792C family washer-extractors, QN models, 20 to 100 lb, front-end control with input and output board.
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
- The machine stops with Eio 31 on the display
- The door may not release right away
- Further cycles will not start
Possible causes
Listed in Speed Queen's documentation
- Board output for the lock pulse
- Lock solenoid wiring and plug
- Input and output board
Other likely causes — what usually sits behind error code Eio 31 on this control. A technician confirms which one it is before any part is replaced.
- A solenoid connector with burned or green contacts that cannot carry the pull-in pulse
- A cracked wire strand near the door hinge where the lock cable flexes
Safe checks before calling for service
- Write down the whole code, including the digits after Eio.
- Let the machine sit until the lock releases.
- Do not tamper with the door switch.
- Leave a sign on it and schedule a repair visit with us.
How a technician diagnoses error code Eio 31
- Read the full code and confirm it repeats after a power cycle.
- Inspect the lock solenoid, its plug and the cable run to the door, with power off.
- Check the pulse output at the board against the commanded signal.
- Test the solenoid coil for continuity.
- Check the board supply.
- Replace the lock, wiring or board only after the test points to it.
- Probing the lock pulse circuit means working beside live voltage that powers a door safety device.
- A door that does not latch properly on a high-speed extractor is an injury hazard.
- Separating a weak pulse output from a failing solenoid needs a meter.
How error code Eio 31 differs from similar codes
Eio 31 is the pulse pin check. Eio 36 is the pulse hardware failure, and Eio 30 and Eio 32 cover the disable and relay pins.
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 the lock pulse?
It is a short burst that pulls the lock in before it is held. If the check fails, the control cannot rely on the lock.
May I run a cycle anyway?
No. The control will not run, and the lock should not be defeated.
Will it clear by itself?
Not reliably. The failed check usually returns until the cause is repaired.
Need help with Speed Queen error code Eio 31?
A technician confirms the cause on site and gives you the price in writing before any work starts.