Huebsch QN Washer-Extractor Error Code Eio 29: Mosfet Enable Pin
Eio 29 on a Huebsch QN washer-extractor means the input and output board's self-check found a problem with the pin that switches on the Mosfet enable. The machine stops; turn it off at the disconnect and wait until the door lock releases.
High: the board's outputs are blocked, so the machine will not run until the cause is fixed.
What does Huebsch error code Eio 29 mean?
The input and output board on a QN-series washer-extractor runs a self-check of its own circuits. One of them is the Mosfet enable, an electronic switch that gives the board's outputs permission to work. Without it the board cannot safely run valves, the door lock or other loads. The self-check looks at the pin that drives this switch, and when the pin does not behave as expected the board reports Eio 29 and the control halts the machine. Operators see a dead or halted washer with the code on the display. This is a board self-test result rather than a message about the wash, so it does not clear by adjusting cycles. The manual lists no owner step because the problem is on the board. The board's enable circuit is the first suspect, then the connections between it and the user control, the supply power reaching it, and signs of heat, moisture or damage.
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-extractor will not start and Eio 29 is on the display
- The machine stops in the middle of a cycle with the code
- Nothing in the wash circuits responds
Possible causes
Listed in Huebsch's documentation
- Failure in the input and output board and its enable circuit
- Connections between the board and the user control
- Supply power not reaching the board
- Heat, moisture or damage on the board
Other likely causes — what usually sits behind error code Eio 29 on this control. A technician confirms which one it is before any part is replaced.
- Condensation inside the control housing in a humid laundry room
- A connector between the board and the user control that has worked loose from vibration
Safe checks before calling for service
- Turn the machine off at its disconnect and wait until the door lock lets go.
- Switch it back on once to see whether the code returns.
- Keep the cover on and do not touch the board.
- If Eio 29 comes back, write down what the machine was doing and call us to test the board.
How a technician diagnoses error code Eio 29
- Read the code and history, and confirm Eio 29 returns after a power cycle.
- Check the supply voltage reaching the board.
- Inspect the board and its connectors for heat marks, moisture or loose pins with the power locked off.
- Reseat the connectors to the user control and retest.
- Replace the input and output board only after the supply and connections test normal.
- The board carries live 208 to 240 V circuits and must be opened only with the power locked out.
- Telling a board failure from a loose connector or low supply needs a meter and the wiring diagram.
- Boards with damaged circuits can fail again if the cause, such as moisture, is not found first.
How error code Eio 29 differs from similar codes
Eio 29 is a pin self-check. Eio 33 reports a hardware failure of the same enable circuit, and Eio 38 and 39 report that it cannot be turned on or off.
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
Can I restart the machine to clear Eio 29?
One restart is reasonable to see whether the code returns. Repeated restarts will not repair a board.
Is this a door problem?
No. Eio 29 concerns the enable switch for all outputs, not the lock.
Why does the manual give no owner step?
The problem sits on the board, so it needs testing by a technician.
Need help with Huebsch error code Eio 29?
A technician confirms the cause on site and gives you the price in writing before any work starts.