Huebsch QN Washer-Extractor Error Code Eio 39: Mosfet Enable Stuck On
Eio 39 means the control tried to turn the Mosfet enable off and could not, which can leave outputs live when they should be dead. Switch the washer off at its main disconnect, leave it off, and call us right away.
High: outputs may stay live, so the machine must stay switched off until the board is tested.
What does Huebsch error code Eio 39 mean?
The Mosfet enable lets the board's outputs work when it is on and keeps them dead when it is off. Eio 39 is the opposite case to Eio 38: the control asked for the enable to switch off, and it stayed on. An enable that stays on can leave valves, the lock or other loads powered when they should be quiet, so the control posts the code and keeps the machine from running. Operators see a stopped washer, and some parts may remain powered. The danger is the main reason this code is treated seriously, and the reason we ask you to keep the machine switched off at its disconnect until the board has been tested. The usual suspects are whether the enable is letting outputs stay live, the board condition and connectors, and the signal the control sends to the board. A board with a switch stuck on is not repaired by restarting 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 is stopped and Eio 39 is on the display
- Some parts of the machine may stay powered
- The code remains after the control is restarted
Possible causes
Listed in Huebsch's documentation
- Enable letting the outputs stay live
- Board condition or connectors damaged
- Control signal to the board wrong
Other likely causes — what usually sits behind error code Eio 39 on this control. A technician confirms which one it is before any part is replaced.
- A switching stage that has shorted closed after a surge
- A solder joint or connector problem that holds the enable line high
Safe checks before calling for service
- Switch the washer off at its main disconnect and leave it off.
- Do not open the cover or touch the board.
- Wait until the door lock lets go before you open the door, and keep clear of the basket.
- Call us right away to schedule service, and note any part that still seemed powered.
How a technician diagnoses error code Eio 39
- Read the code and confirm Eio 39 appears with the cycle idle.
- With the power locked off, check whether outputs remain energized once the enable is commanded off.
- Inspect the board and connectors for damage.
- Check the control signal to the board.
- Replace the board after the readings show the enable stuck on.
- An enable stuck on can leave outputs energized, so any work must start with the power locked out and verified dead.
- Confirming that outputs stay live takes a meter on 208 to 240 V circuits.
- Releasing a door lock that may not be controlled correctly is a hazard near a basket that may turn.
How error code Eio 39 differs from similar codes
Eio 39 is the enable that cannot be turned off. Eio 38 is the one that cannot be turned on, which stops the machine without live outputs.
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 39 treated as more serious than Eio 38?
An enable that stays on can leave outputs live. One that stays off simply leaves them dead.
Can I keep using the machine?
No. Keep it switched off at the disconnect.
Can I open the control cover to look?
No. Leave it closed.
Need help with Huebsch error code Eio 39?
A technician confirms the cause on site and gives you the price in writing before any work starts.