UniMac Washer-Extractor Error Code EI04: IR Upload Request

What does UniMac error code EI04 mean?

A transfer between a programming tool and a UniMac UW pocket hardmount washer-extractor follows a set order: the tool announces what it wants to do, the control agrees, and then the data moves. EI04 appears when the control was waiting for an upload request and received something else or nothing. The transfer began, but the next step was not the one the washer was waiting for. It is a sequence problem in the data link and not a problem with the machine. The wash, drain and spin systems are untouched. The manual lists programming tool steps done in the wrong order, a tool aimed poorly during the first step, a smudged window over the infrared port, and a control receiver that misses the upload request. In practice the person holding the tool can usually solve it by starting again from the first step, holding the tool still, and wiping the window.

Affected models and control systems

This applies to the PHM1263R family of UniMac UW pocket hardmount washer-extractors, models UWL, UWN and UWU 035 to 125, such as the UWL035K12. EI04 is one of the infrared messages on this control.

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

• EI04 on the display during programming
• Tool stuck on its first or second screen
• Washer cycles that continue as usual
• A second attempt that goes through

Possible causes

Listed in UniMac's documentation

• Programming tool steps done in the wrong order
• A tool aimed poorly during the first step
• A smudged window over the infrared port
• A control receiver that misses the upload request

Other likely causes — what usually sits behind error code EI04 on this control. A technician confirms which one it is before any part is replaced.

• A tool menu choice that sends a download where the control expects an upload
• A first step that was interrupted by someone walking between the tool and the window
• A tool whose clock or buffer was left over from an earlier failed session

Safe checks before calling for service

How a technician diagnoses error code EI04

1. Read the code and have the operator walk through the tool steps in order.
2. Reset the tool session and try again from a clean start.
3. Clean the window and check for glare or obstruction.
4. Compare behavior with a second tool or machine to isolate the receiver.
5. Replace the control only if the receiver is shown to miss valid requests.

Technical reference

Document

Washer-Extractor Programming PHM1263R, Part No. F8208801R7, September 2015, Error Codes (p.53-54)

Maker documentation

UniMac owner support

Edition

Part No. F8208801R7, September 2015

Models / control

PHM1263R family pocket hardmount washer-extractor (UWL/UWN/UWU 035-125) front-end control

Section

Error Codes, Table 16, printed pp. 52-53 (PDF pp. 54-55)

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.