Huebsch QN Washer-Extractor Error Code Eio 38: Mosfet Enable Stuck Off
Eio 38 means the control tried to turn the Mosfet enable on and could not, so the board's outputs stay dead. Turn the machine off at the disconnect, switch on once to see if it repeats, and leave the control cover alone.
High: the outputs cannot be enabled, so the machine does nothing until the board is repaired.
What does Huebsch error code Eio 38 mean?
The Mosfet enable is the permission switch for the board's outputs. When a cycle starts, the control asks the board to turn it on so valves, the lock and other loads can work. In Eio 38, the request was made and the enable did not turn on. With the enable off, the outputs stay dead and nothing can run. Operators see a washer that does nothing when a cycle is started. The code is the mirror image of Eio 39, where the enable cannot be turned off. It also differs from Eio 29 and Eio 33, which report on the circuit's self-tests. The board's enable circuit and its supply are the places to test. The board condition and its connectors come next, and the signal that the user control sends to the board completes the list. A dead output stage looks the same from the front as a missing signal, so a meter is needed to separate them.
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
- Starting a cycle does nothing and the display shows Eio 38
- No water, lock or drain action follows the start key
- The code returns after every restart
Possible causes
Listed in Huebsch's documentation
- Board unable to switch its enable on
- Supply voltage to the board missing or low
- Board condition or connectors damaged
- User control signal to the board not arriving
Other likely causes — what usually sits behind error code Eio 38 on this control. A technician confirms which one it is before any part is replaced.
- A cable between the user control and the board with a broken conductor from repeated flexing
- A board stage damaged by water that reached the housing
Safe checks before calling for service
- Turn the machine off at its disconnect and wait a moment.
- Switch on once to see whether the code repeats.
- Leave the control cover alone.
- Contact us to schedule service for the board, and bring the code to the call.
How a technician diagnoses error code Eio 38
- Read the code and confirm Eio 38 returns on each start request.
- Measure the supply voltage to the board.
- Check the signal from the user control to the board.
- Inspect the board and connectors for damage with the power locked off.
- Replace the board after the supply and signal checks are good.
- The board carries live 208 to 240 V circuits behind a cover that should stay closed.
- A board that cannot enable and a control that does not ask look alike without a meter and the signal levels.
- Replacing a board without proving the supply can lead to a repeat failure.
How error code Eio 38 differs from similar codes
Eio 38 is the enable that cannot be turned on. Eio 39 is the enable that cannot be turned off, which carries a safety concern.
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
What is the difference between Eio 38 and Eio 39?
Eio 38 means the enable will not turn on, and Eio 39 means it will not turn off.
Why does nothing happen when I press start?
With the enable off, the outputs stay dead.
Is it safe to leave the machine plugged in?
Keep it off at the disconnect until we test it.
Need help with Huebsch error code Eio 38?
A technician confirms the cause on site and gives you the price in writing before any work starts.