Huebsch QN Washer-Extractor Error Code Eio 37: Door Lock Full Test
Eio 37 reports a complete lock-circuit failure: the door lock solenoid circuit failed its full hardware test. The control cannot trust any lock command, so power the machine off, wait for the lock to release, and leave the door and latch alone.
High: the whole lock circuit failed its test, so the machine will not run.
What does Huebsch error code Eio 37 mean?
Most lock codes on the QN washer-extractor name one part of the path to the door lock solenoid. Eio 37 is wider. The board's full hardware test covers the whole drive path, from the pin to the output that powers the solenoid, and the result was a failure. Since no single stage is named, the control cannot trust any lock command and will not run the machine. Operators see a washer that stays idle, with the door lock behaving oddly. The board's lock circuits and the solenoid wiring are tested together. A failed drive path on the output board is the first possibility. A lock solenoid or harness with a short or an open winding, a poor connector or ground in the lock circuit, and a weak supply during the test are the others. Because the failure can be anywhere along the path, narrowing it down is the technician's job.
Affected models and control systems
This applies to Huebsch QN-series washer-extractors in the CHM1792C family, 20 to 100 lb, with the front-end control in that programming manual.
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 washer stays idle and shows Eio 37
- The door lock makes no sound or sticks
- Power cycling does not clear the code
Possible causes
Listed in Huebsch's documentation
- Lock drive path on the output board failing, from pin to output
- Lock solenoid or harness with a short or open winding
- Poor connector or ground in the lock circuit
- Weak supply to the output board during the test
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 ground strap at the door frame that has corroded and raises resistance in the lock circuit
- A board whose drive path was damaged by a surge when the solenoid shorted
Safe checks before calling for service
- Turn the machine off at its disconnect and wait until the lock lets go.
- Do not tamper with the door or its latch.
- Reapply power once and read the display.
- A repeat tells us to come and test the lock circuit; give us the exact code.
How a technician diagnoses error code Eio 37
- Read the code and confirm Eio 37 returns after a power cycle.
- Check the supply and ground at the output board.
- With the power locked off, test the solenoid coil and the harness continuity.
- Inspect connectors and the door frame ground.
- Test the board's drive path and replace the board or solenoid only after the earlier steps are clean.
- The test spans the whole lock circuit, which carries live voltage on the board and at the door.
- The lock is a safety device for a basket spinning at speed, so its repair follows the maker's procedure.
- With many possible points of failure, narrowing the cause needs a meter, the diagram and an organized sequence.
How error code Eio 37 differs from similar codes
Eio 37 is the full hardware test of the lock circuit. Eio 34, Eio 35 and Eio 36 each test one stage of it.
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 Huebsch washer error codes
Why is Eio 37 more serious than the pin codes?
It reports that the whole lock drive path failed its test, so the control trusts no lock command.
Can I try to open the door?
Only after the power is off and the lock has released.
Will it clear itself?
A circuit failure does not clear by itself.
Need help with Huebsch error code Eio 37?
A technician confirms the cause on site and gives you the price in writing before any work starts.