UniMac QN Washer Error Code E dS: Voltage Configuration
On UniMac QN washer-extractors, E dS is the brownout and voltage configuration error: the dip switches that tell the control about the supply voltage are not set correctly. Power the machine down, do not touch the switches yourself, and call us so they can be set for your supply.
Medium: the machine will not run until the voltage setting is corrected, but nothing is damaged.
What does UniMac error code E dS mean?
The control needs to know what supply voltage the machine is connected to, so it can judge whether the incoming power is normal or dipping. That information comes from a bank of dip switches on a board. E dS appears when the settings do not fit the machine. The control cannot trust the voltage setting, so it stops rather than guess about the power it is working with. The most common situation is after a repair, a board replacement or a move to a different power supply, because a replacement board arrives with its switches in a standard position. The cause can be switches set for the wrong supply voltage, a building voltage that differs from the setting, a recently replaced board left with the shipped switch positions, or a board configuration that no longer matches the machine.
Affected models and control systems
This applies to UniMac QN washer-extractors of 20 to 100 lb, such as the UCA020QN, in the CHM1792C family with the front-end control and its voltage dip switches.
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
- E dS on the display
- Code appearing right after a board replacement or a move
- Washer refusing to start although nothing else is wrong
Possible causes
Listed in UniMac's documentation
- Dip switches set for the wrong supply voltage
- Building supply voltage that differs from the setting
- A recently replaced board left with its shipped switch positions
- A board configuration that no longer matches 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.
- A dip switch knocked out of position during a repair
- A machine moved from a 208 V site to a 240 V site without the settings changed
- A swapped board from another washer carrying that machine's settings
Safe checks before calling for service
- Power the machine down.
- Do not touch the dip switches yourself.
- Note whether the code began after a repair or a move.
- Call us so the dip switches can be set correctly for your supply.
- Keep the model and serial number handy.
How a technician diagnoses error code E dS
- Ask what changed before the code: a repair, a board swap or a move.
- Measure the actual supply voltage at the machine disconnect.
- With power locked out, read the dip switch positions on the board.
- Compare them with the maker's table for the machine and supply.
- Set the switches to match the measured voltage and model.
- Power up and run a cycle to confirm the code is gone.
- Setting dip switches wrongly can make the control judge a brownout wrongly, or mask a real one.
- Measuring the supply means working at a live 208 to 240 V disconnect.
- The right positions come from the maker's table for this model, not from a guess.
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
Why did E dS appear after a repair?
A replacement board arrives with the switches in a standard position, which may not match your supply.
Can I flip the switches myself?
No. A wrong setting leaves the machine misjudging its power. We set them from the measured voltage.
Is E dS a power outage?
No. It says the voltage setting and the machine do not agree. The supply can be fine.
Need help with UniMac error code E dS?
A technician confirms the cause on site and gives you the price in writing before any work starts.