UniMac QN Washer Error Code E id oUtPUt: Wrong I/O Board
On UniMac QN washer-extractors, E id oUtPUt is an input and output board ID error: the control found that the output board is not the one it expects for this configuration. Do not keep restarting. Make a note of when it began, keep the cabinet closed, and call us so the correct board can be installed.
High: the machine will not run normally until the correct I/O board is installed.
What does UniMac error code E id oUtPUt mean?
The input and output board switches the valves and the door lock, and the control checks its identity against the machine's configuration. E id oUtPUt appears when the board in the machine is not the one expected. That usually follows a board replacement with the wrong part. The machine will not run normally until the right board is installed. We match the part to your data plate. The part number of the installed I/O board, the machine configuration and model data, the board connections and whether a recent repair changed the board are what we compare. This is a different board from the one behind E id drivE, which concerns the drive board that runs the motor. The code is about identity, not a burned-out part, so the board can look perfectly healthy and still be wrong for the washer.
Affected models and control systems
This applies to UniMac QN washer-extractors of 20 to 100 lb, such as the UCA020QN, in the CHM1792C family. The correct I/O board depends on the machine's model and configuration.
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
- E id oUtPUt on the display
- Valves or door lock not responding normally
- Code appearing after an I/O board replacement
Possible causes
Listed in UniMac's documentation
- Part number of the installed I/O board
- Machine configuration and model data
- Board connections
- Whether a recent repair changed the board
Other likely causes — what usually sits behind error code E id oUtPUt on this control. A technician confirms which one it is before any part is replaced.
- A board that fits the connectors but belongs to a different model
- A board replaced during a leak repair without checking the part number
- A board connector that is plugged into the wrong port after service
Safe checks before calling for service
- Do not keep restarting the machine.
- Make a note of when E id oUtPUt began, especially after a repair.
- Leave the cabinet closed.
- Call us so the correct board can be identified and installed.
- Have the model and serial numbers from the data plate ready.
How a technician diagnoses error code E id oUtPUt
- Ask about any recent repair, leak or board replacement.
- Read the data plate model and configuration.
- With power locked out, read the I/O board part number.
- Compare it with the parts list for the model.
- Check each board connection against the wiring diagram.
- Install the correct board and run a full cycle.
- The I/O board switches live valve and lock circuits behind the panels.
- A board that does not match the machine can drive the wrong loads.
- Finding the right part number needs the maker's data for this model.
How error code E id oUtPUt differs from similar codes
E id oUtPUt concerns the input and output board identity, while E id drivE concerns the drive board identity.
Technical reference
- Document
- Washer-Extractor Programming CHM1792C_SVG, Part No. F8641001ENR4, Error Codes Table 29 (pp. 100-107)
- Maker documentation
- UniMac owner support
- 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 UniMac washer error codes
Is the I/O board broken?
Not necessarily. The control says it is not the board it expects.
Can I use an old board from a spare washer?
Only if it is the exact part for this configuration. We confirm that first.
Is this the same as E bS?
No. E bS is a short on the I/O board. E id oUtPUt is a mismatch in identity.
Need help with UniMac error code E id oUtPUt?
A technician confirms the cause on site and gives you the price in writing before any work starts.