UniMac Washer Error Code EiXX: Infra-Red Communications
EiXX on a UniMac QN washer-extractor is an infra-red communications error, where XX is a two-character value showing what went wrong in a transfer from an external device. The display clears by itself after 2 seconds, and washing, draining and spinning carry on. Catch the two characters, re-aim the tool and try again.
Low: a data link message only; the unit keeps running.
What does UniMac error code EiXX mean?
On UniMac QN washer-extractors such as the UCA020QN, EiXX is an infra-red communications error. The XX stands for a two-character value that says what went wrong with the transfer from an external device. The message shows briefly, then the display clears by itself after 2 seconds, which is why the characters are easy to miss. It affects only the data link through the infra-red window, so washing, draining and spinning carry on, and cycles are unaffected. The value after Ei tells a technician which kind of transfer problem occurred, so it is worth noting. The manual lists the aim of the external device at the window, window cleanliness and bright light, the two-character value that follows Ei, and the control infra-red circuit if the message repeats.
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 input and output (I/O) 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
- Ei followed by two characters flashes on the display
- The message disappears after about 2 seconds
- The tool reports a failed transfer
- Normal cycles continue
Possible causes
Listed in UniMac's documentation
- Aim of the external device at the infra-red window
- Window cleanliness and bright light
- The two-character value that follows Ei
- Control infra-red circuit if it repeats
Other likely causes — what usually sits behind error code EiXX on this control. A technician confirms which one it is before any part is replaced.
- A tool held at a steep angle or too far from the window
- Direct sun from a nearby window on the control
- A tool battery too weak to hold a full transfer
Safe checks before calling for service
- Catch the two characters after Ei before the display goes blank.
- Re-aim the external device at the infra-red window and try again.
- Wipe the window and shade it from strong light.
- If the message keeps coming back, call us and tell us the value.
- Hold the tool steady until the transfer ends.
How a technician diagnoses error code EiXX
- Note the two-character value and what transfer was in progress.
- Clean the window and repeat the transfer in shade at close range.
- Check the tool's battery and its software for this machine.
- Try a second tool to compare.
- Replace the receiver only if the same value repeats with a good tool.
- The infra-red circuit is on the control board, which is inside the cabinet near line-voltage wiring.
- The two-character value must be matched to the manual to know what failed, and it flashes by quickly.
- A transfer that fails partway can leave data half written, which a technician verifies.
How error code EiXX differs from similar codes
On QN machines the infra-red errors share one EiXX format. UW pocket hardmount washers list each one separately, such as EI01 to EI0F.
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 does the XX mean?
It is a two-character value that identifies the kind of transfer error.
Why does the message disappear?
The display clears it by itself after 2 seconds.
Does it stop my wash?
No. Only the data link is involved.
Need help with UniMac error code EiXX?
A technician confirms the cause on site and gives you the price in writing before any work starts.