Speed Queen Washer Error Code Eio 29: Mosfet Enable Pin
Eio 29 on a CHM1792C washer-extractor is a hardware self-check code from the input and output board about the Mosfet enable pin. The control treats the board as unsafe and stops the machine. Write down the full code, let the door lock release, and call us.
High: the control treats the board as unsafe, and the machine will not run until the cause is fixed.
- Code
- Eio 29
- Maker
- Speed Queen
- Equipment
- Washers
- Applies to
- CHM1792C family washer-extractor (QN models, 20-100 lb) front-end control
What does Speed Queen error code Eio 29 mean?
The input and output board in a CHM1792C washer-extractor switches the machine's outputs, such as valves, the door lock and the drive. A Mosfet is an electronic switch on that board, and the enable pin is the line the control uses to allow the outputs to turn on. At self-check the board tests that pin. Eio 29 means the pin did not behave as it should, so the control cannot count on the board's outputs and treats the board as unsafe to use. The machine stops with the code on the display. Because the enable line sits ahead of every other output, the machine will not run until the board is dealt with. The manual lists the input and output board condition, board connectors and supply, and the control board that sends the enable signal. It is a hardware self-check, not a result of load, water or door use.
Affected models and control systems
CHM1792C family washer-extractors, QN models, 20 to 100 lb, with the front-end control and its input and output board.
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 machine stops and Eio 29 stays on the display
- No cycle will start
- The door may stay locked for a time after the stop
Possible causes
Listed in Speed Queen's documentation
- Input and output board condition
- Board connectors and supply
- Control board that sends the enable signal
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.
- A surge or brownout that stressed the board's enable circuit
- A loose board connector working free after repeated high-speed extract
Safe checks before calling for service
- Write down the full code, Eio and both digits.
- Give the door lock time to release before you open the door.
- Leave the washer-extractor out of service with a sign on it.
- Book a visit and read us the code.
How a technician diagnoses error code Eio 29
- Read the full code and any history, then power the machine down and up to see whether it returns.
- Check the board connectors and the supply voltage to the input and output board.
- Measure the enable line for the state the control commands.
- Compare with Eio 33, 38 and 39 to see which Mosfet enable check is failing.
- Replace the input and output board or the control only after the enable line test.
- The input and output board switches live 208-240 V loads, so probing it is a shock hazard.
- Telling a bad board from a bad enable signal needs a meter and the machine's own diagnostics.
- The control stops the machine to protect people and equipment, so it should not be forced to run.
How error code Eio 29 differs from similar codes
Eio 29 reports the enable pin at self-check. Eio 33 reports the enable circuit hardware, Eio 38 an enable that cannot be turned on, and Eio 39 one that cannot be turned 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 Speed Queen washer error codes
Can I restart the washer-extractor with Eio 29?
We advise against it. The control has judged the board unsafe, so keep the machine out of service until a technician checks it.
Will Eio 29 clear by itself?
A hardware self-check failure normally returns until the board or its supply is repaired.
What should I tell you when I call?
Read us the whole code, both digits after Eio, and any recent power outage or storm.
Need help with Speed Queen error code Eio 29?
A technician confirms the cause on site and gives you the price in writing before any work starts.