UniMac Washer-Extractor Error Code E dS: Brownout and Voltage Setup

What does UniMac error code E dS mean?

E dS on a UniMac QN washer-extractor such as the UCA020QN is the brownout and voltage configuration error. The control has a bank of dip switches that tell it what supply voltage the machine runs on. It compares them with what it measures. When the setting does not suit the machine, the control stops, because it cannot trust the voltage setting for protecting the drive and motor.

The code tends to appear after a repair, a board replacement or a move to a different power supply. It shows up at power-up, before anything else happens. The switches may be set for the wrong machine voltage. The building supply may not match the setup. A dip switch setting can be lost after a board replacement. A board configuration can conflict with the machine.

The maker's operator step is to correct the dip switch configuration, which in practice means a technician sets it for your supply. Leave the switches alone, because a wrong setting can affect how the machine protects itself.

Affected models and control systems

E dS is listed for the CHM1792C family washer-extractors, the QN models from 20 to 100 lb, with the front-end control; the manual's example model is the UCA020QN.

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

• The display shows E dS at power-up
• The washer will not begin any cycle
• The code began after a repair or a move
• It returns after each power cycle

Possible causes

Listed in UniMac's documentation

• Dip switches set for the wrong machine voltage
• A building supply voltage that does not match the setup
• A dip switch setting lost after a board replacement
• A board configuration that conflicts with the machine

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

• Replacement control board shipped with a different switch pattern
• Machine moved from a 208 V building to a 240 V one
• Switch bank knocked during panel work
• Supply phase or voltage changed by a building electrical upgrade

Safe checks before calling for service

How a technician diagnoses error code E dS

1. Read the code and ask about repairs, moves and electrical work.
2. Measure the supply voltage at the machine.
3. Read the dip switch positions against the maker's table for that voltage.
4. Correct the switches and power up to confirm the code clears.
5. Look for a board or supply difference if the code remains.

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.