UniMac Washer-Extractor Error Code Ed07: No Setup Packet

What does UniMac error code Ed07 mean?

Before the motor drive of a UniMac UC-series washer-extractor can turn the motor, the front-end control sends it a setup packet that holds the motor and spin parameters. After that, the control sends run commands. The drive expects to see the setup first. If a run command arrives without it, the drive does not know how to drive the motor, rejects the command and shows Ed07, and the batch stops. This usually looks like a start-up or communication slip between control and drive. The manual lists a broken communication link between the control and the drive, a power interruption just before the cycle began, control and drive software that do not match, and a board that dropped the setup packet. The message applies to Design 2 and 3 models only. Since the likeliest case is a timing glitch at power-up, the operator step is simply to switch the power off, then on, and give the control time to finish starting before you press start.

Affected models and control systems

This applies to the CHM495R family of UniMac UC-series washer-extractors, 20 to 100 lb, with the motor drive, for example the UCH020GNF. Only Design 2 and 3 models report Ed07.

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

• Ed07 on the display right after pressing start
• Drum that never begins to turn
• The code appearing just after a power-up or power blink
• A cycle that works on the second attempt

Possible causes

Listed in UniMac's documentation

• A broken communication link between the control and the drive
• A power interruption just before the cycle began
• Control and drive software that do not match
• A board that dropped the setup packet

Other likely causes — what usually sits behind error code Ed07 on this control. A technician confirms which one it is before any part is replaced.

• A brownout or flicker on the building supply that restarts the drive but not the control
• A control or drive board replaced earlier with a different software revision
• A communication plug that makes intermittent contact when the cabinet vibrates

Safe checks before calling for service

How a technician diagnoses error code Ed07

1. Read the code and ask whether the message follows a power interruption or appears on every start.
2. Check the supply for dips or interruptions at the disconnect.
3. Inspect the control-to-drive communication plug and wiring for intermittent contact.
4. Compare the software revisions on the control and the drive with the maker's compatibility information.
5. Replace a board only after the link and software have been checked.

Technical reference

Document

Washer-Extractor Programming CHM495R_SVG, Part No. F8208501ENR10, March 2017, Error Codes (pp. 36-37)

Maker documentation

UniMac owner support

Edition

Part No. F8208501ENR10, March 2017

Models / control

CHM495R family washer-extractor front-end control (20-100 lb)

Section

Error Codes table, pp. 36-37 (E Pr only on Design 1 models; Ed01-Ed11 on Design 2 and 3 models)

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.