UniMac Washer Error Code EnXX: Machine ID Chip
EnXX on a UniMac QN washer-extractor is a machine ID chip error: the control cannot read the small chip that tells it which machine it is. The XX is a value pointing to the type of chip problem. Power the machine down and up, look from outside without opening anything, and call us if it returns.
High: without the chip being read, the machine may not run cycles correctly.
What does UniMac error code EnXX mean?
EnXX on UniMac QN washer-extractors such as the UCA020QN is a machine ID chip error. The control relies on a small chip to learn which machine it belongs to, meaning the size, the model and the options it should use. If the control cannot read that chip, it does not know which machine it is running, and the machine may not start cycles correctly until the chip is read again. The XX is a value that points to the type of chip problem. A restart sometimes lets the control read the chip again. When it does not, the manual lists a loose connector between the user control and the chip, a machine ID chip that sits crooked or dirty, damaged wiring near the chip, and a user control board that cannot read the chip. Chips should never be removed or swapped by hand.
Affected models and control systems
Listed for the CHM1792C family of UniMac QN washer-extractors (20-100 lb), with the UCA020QN as the example model,, on the user control with the machine ID chip.
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
- En followed by two characters on the display
- Machine size or options seem wrong or unavailable
- Cycles will not start properly
- Message returns after restart
Possible causes
Listed in UniMac's documentation
- Loose connector between the user control and the chip
- Machine ID chip that sits crooked or dirty
- Wiring near the chip that is damaged
- User control board that cannot read the chip
Other likely causes — what usually sits behind error code EnXX on this control. A technician confirms which one it is before any part is replaced.
- A chip pushed out of line when the user control was removed and refitted
- Lint or damp at the chip socket on the back of the control
- A chip from another machine or size fitted during a swap
Safe checks before calling for service
- Power the machine down, power it up and try again.
- Look at how the user control meets the machine ID chip, staying outside the cabinet while you do.
- Do not remove or swap chips.
- If EnXX returns, call us.
- Write down the two characters after En.
How a technician diagnoses error code EnXX
- Read the two-character value and note whether it changes on restart.
- With power locked out, inspect the chip, socket and connector for seating and dirt.
- Check the wiring near the chip for damage.
- Confirm the chip matches the machine's model and options.
- Replace the chip, connector or user control only after those checks.
- The chip tells the control which machine it is, and a wrong or swapped chip can make the machine run with the wrong settings.
- Reseating the chip and connector means opening the user control, which should be done with the machine isolated.
- A damaged socket or board is found only by close inspection and testing.
How error code EnXX differs from similar codes
EnXX is about the machine identity chip. E nr is a communication loss with the I/O board, and the Eio codes are the I/O board's own hardware checks.
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
What is the machine ID chip?
A small chip that tells the control which machine it belongs to and which options to use.
Can I move a chip from another washer?
Please do not. A chip from another machine can set the wrong size or options.
Will a restart fix EnXX?
Sometimes, if the chip was only slightly out of place. If not, it needs a look.
Need help with UniMac error code EnXX?
A technician confirms the cause on site and gives you the price in writing before any work starts.