Huebsch QN Washer-Extractor Error Code Eio 42: Door Lock Input Pin
Eio 42 means the pin that reads whether the door is locked failed its check on the input and output board. That signal tells the control it is safe to turn the basket, so the machine stops. Turn it off, close the door squarely, and restart once.
High: the control cannot confirm the door is locked, so it will not run the basket.
What does Huebsch error code Eio 42 mean?
Before a QN washer-extractor spins its basket, the control wants proof that the door is locked. A lock feedback switch sends that proof to a pin on the input and output board, and the board checks the pin as part of its self-test. In Eio 42 the check failed. Without a trustworthy door-locked signal the control stops the machine, so a washer will not begin a cycle or quits just after beginning. The test is about the input side of the lock, not the solenoid that moves it. The board's input circuit, the lock switch wiring and the connector are the places to test. A feedback switch with a broken or loose wire is a typical cause, and so is a connector at the board that has worked loose from vibration. Looking for lint or a garment caught in the door opening is worthwhile, though the code does not name it.
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 will not start a cycle and shows Eio 42
- The cycle stops soon after starting
- The door looks closed but the machine acts as if it is not locked
Possible causes
Listed in Huebsch's documentation
- Lock input circuit on the board failing
- Lock feedback switch with a broken or loose wire
- Connector at the board loose
Other likely causes — what usually sits behind error code Eio 42 on this control. A technician confirms which one it is before any part is replaced.
- A feedback switch contact coated with detergent residue near the door latch
- A wire fatigued where the harness crosses the door hinge
Safe checks before calling for service
- Turn the machine off and let the lock release on its own.
- Shut the door squarely and look for anything wedged in the opening.
- Switch power back on and see if the code has cleared.
- If not, use the online form to book service and tell us whether the lock sounded.
How a technician diagnoses error code Eio 42
- Read the code and confirm Eio 42 returns after a power cycle.
- Watch the lock feedback input on the board as the door is closed and locked.
- Check the lock switch and its wiring for continuity with the power locked off.
- Inspect the connector at the board.
- Replace the switch or board only after the readings point to it.
- The lock input is part of the safety chain for a basket that spins at speed, so its repair follows the maker's procedure.
- The board sits behind a cover near live 208 to 240 V circuits.
- Telling a broken switch wire from a failing input pin takes a meter and the wiring diagram.
How error code Eio 42 differs from similar codes
Eio 42 concerns the input that reads the lock. Eio 30 to Eio 37 concern the outputs that move the lock.
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
Does Eio 42 mean the lock itself is broken?
Not necessarily. It means the signal that confirms the lock did not pass its check.
Can I clear it by slamming the door?
No. Close the door gently and squarely.
Will it clear on its own?
A loose connector may seat again after a restart, but a failed input returns.
Need help with Huebsch error code Eio 42?
A technician confirms the cause on site and gives you the price in writing before any work starts.