UniMac Washer-Extractor Error Code Ed11: Invalid Command
Ed11 means the drive was handed a motor command it could not accept. The batch carries on and nothing is required from you, so keep a count and call us if it repeats or a batch stops.
Low: a single rejected command does not stop the batch, but a repeating pattern should be checked.
- Code
- Ed11
- Maker
- UniMac
- Equipment
- Industrial laundry
- Applies to
- CHM495R family washer-extractor front-end control (20-100 lb)
What does UniMac error code Ed11 mean?
Every time the front-end control of a UniMac UC-series washer-extractor wants the motor to do something, it sends a command to the drive. The drive checks that the command makes sense, for example a speed or direction that the motor setup allows. If a command arrives garbled or out of range, the drive refuses it and posts Ed11. Because the next command is usually correct, the batch carries on and no operator action is needed. It usually reads as a one-time communication hiccup between control and drive, and not as a halted cycle. The manual lists control-to-drive communication, electrical noise on the supply, control and drive software pairing, and board condition if it repeats. The message applies to Design 2 and 3 models only. A single Ed11 can be ignored, but a pattern of repeated ones, or one that comes with a stopped batch, shows the link is not healthy and is worth checking.
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 show Ed11.
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
- Ed11 appearing briefly and the cycle continuing
- A message that comes and goes without a stop
- Repeats at the same step of a cycle
- An occasional jerk or pause in the drum
Possible causes
Listed in UniMac's documentation
- Control-to-drive communication
- Electrical noise on the supply
- Control and drive software pairing
- Board condition if it repeats
Other likely causes — what usually sits behind error code Ed11 on this control. A technician confirms which one it is before any part is replaced.
- A communication cable run close to a motor lead, which picks up noise when the motor is loaded
- A power supply shared with welding or other noisy equipment
- A control or drive board swapped earlier with a different software version
Safe checks before calling for service
- Let the cycle continue; nothing is required from you.
- Keep count of how often Ed11 appears and at which step.
- Keep damp mops and loose cables away from the machine.
- If it repeats or a batch stops, call us with your count and the dates.
How a technician diagnoses error code Ed11
- Read the code history and see how often Ed11 has been logged.
- Inspect the communication wiring between control and drive for routing close to power leads.
- Check the supply for electrical noise or voltage disturbance with a meter.
- Compare control and drive software versions against the maker's pairing information.
- Replace a board only if the problem follows it after wiring and supply are cleared.
- Inspecting wiring between the boards means working near live terminals.
- Noise on a supply line can only be found with test equipment.
- Matching software versions between control and drive needs the maker's information.
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.
Related UniMac industrial laundry error codes
Is one Ed11 a problem?
Not usually. It is a single rejected command and the cycle continues.
What if it repeats?
A repeating Ed11 shows the link between control and drive is unreliable, and we should check wiring, noise and software.
Will the drive damage the motor?
No. Rejecting a bad command is the drive doing its job. The risk is only that the link may degrade later.
Need help with UniMac error code Ed11?
A technician confirms the cause on site and gives you the price in writing before any work starts.