Speed Queen Washer Error Code Eio 37: Door Lock Full Hardware
Eio 37 reports a door lock solenoid full hardware failure on the input and output board of a CHM1792C washer-extractor. The full side is the stage that holds the lock at full strength after the initial pull, and its check failed. A lock that cannot be held is a safety problem, so the machine stops until the lock releases and you book service.
High: the lock may not hold safely, and the machine will not run until the cause is fixed.
- Code
- Eio 37
- 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 37 mean?
After the short pull-in pulse, the board holds the door lock closed through a holding stage. Eio 37 concerns the full side of that stage, where the lock is held at full strength. The board tests the stage, and Eio 37 means the test failed in hardware. A washer-extractor must have its lock held for the entire spin, and a door that might let go under a full load is a safety problem, so the control stops the machine and keeps the code on the display. The manual lists the hold circuit for the lock on the board, the lock solenoid, and the board supply and connectors. In practice a worn solenoid that overheats while holding, or a connector that makes poor contact, can look the same as a failing board until it is measured. The machine stays out of service until the check passes.
Affected models and control systems
CHM1792C family washer-extractors, QN models, 20 to 100 lb, with the front-end control and its 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 37 on the display
- The lock may buzz or drop out while holding
- No cycle will start afterward
Possible causes
Listed in Speed Queen's documentation
- Hold circuit for the lock on the board
- Lock solenoid
- Board supply and connectors
Other likely causes — what usually sits behind error code Eio 37 on this control. A technician confirms which one it is before any part is replaced.
- A solenoid coil that overheats while holding and loses strength after long cycles
- A connector that makes poor contact and drops the holding current
Safe checks before calling for service
- Write down the full code, including the digits after Eio.
- Let the machine sit until the lock releases.
- The lock and door switches are left as they are.
- Post an out-of-service sign and book service with us.
How a technician diagnoses error code Eio 37
- Read the full code and confirm it returns after a power cycle.
- Inspect the solenoid and connectors for heat marks, with power off and locked out.
- Measure coil resistance and compare it with a good lock.
- Check the supply to the board while the lock holds.
- Test the hold output on the board.
- Replace the solenoid or board according to the result.
- A lock that fails to hold during extract is a serious hazard, so testing it needs a trained hand and a locked-out machine.
- The holding circuit runs on live voltage that is unsafe to probe by hand.
- Telling a weak solenoid from a failing board takes a meter and comparison readings.
How error code Eio 37 differs from similar codes
Eio 37 is the full-hold hardware. Eio 36 is the pulse hardware and Eio 35 is the lock output hardware.
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 does the full side mean?
It is the holding stage after the pull-in pulse, where the lock is held at full strength.
Why does it stop instead of warning me?
A lock that cannot be held under a full spin is a safety risk, so the control will not take the chance.
Could the solenoid be the problem?
Yes. The manual lists it, along with the board and its connectors.
Need help with Speed Queen error code Eio 37?
A technician confirms the cause on site and gives you the price in writing before any work starts.