UniMac Commercial Washer Error Code E d 24: I2T Over Current
E d 24 on a UniMac QN washer-extractor is a fatal I2T hardware over current error: the drive measured too much current for too long. Turn the washer's power off to reset it, check the empty drum turns freely by hand, and call us if it returns.
High: sustained over current can harm the motor and drive, so a repeating code needs attention before more use.
What does UniMac error code E d 24 mean?
I2T is a measure of how much current has flowed and for how long. A short burst of high current is normal when a heavy basket starts turning. A long stretch is not. E d 24 appears when the drive's hardware detects too much current for too long, which it treats as a safety problem, and it shuts down. A rotor that is locked, a motor winding that is failing, or a heavy drag on the drum can cause that. It differs from E d 23, which is a sharp surge, because here the drive sees the current stay high. The cycle stops and the code stays until the power is cycled. A lighter load can ease the drag, but if the drum turns hard even when empty, something mechanical or electrical is causing the extra current.
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 motor drive.
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 d 24 on the display
- Drum straining or slowing during extract
- Motor humming while the drum barely moves
- Code clearing on restart then returning
Possible causes
Listed in UniMac's documentation
- Rotor and drum freedom
- Motor phase windings
- Drive output
- Load size and balance
Other likely causes — what usually sits behind error code E d 24 on this control. A technician confirms which one it is before any part is replaced.
- Wet linens packed unevenly, so the basket drags against the shell
- A worn bearing that tightens up as the machine warms
- A weakening motor winding that draws more current each month
Safe checks before calling for service
- The code resets when you turn the washer's power off.
- With the power off and the drum still, check that the empty drum turns freely by hand, without forcing it.
- Try a lighter load.
- Keep the area around the machine clear.
- A second E d 24 means it is time to call us, so note the load size.
How a technician diagnoses error code E d 24
- Ask about load size and whether the drum felt heavy before the stop.
- With power locked out, turn the drum by hand and feel for bearing drag.
- Check the motor windings for balance and insulation to ground.
- Inspect the wiring from drive to motor.
- Test the drive output stage against the motor load.
- Repair the drag or replace the failing part, then run a full extract.
- Current measurements and winding tests involve live 208 to 240 V motor circuits.
- Feeling bearing drag on a heavy basket is a pinch and crush risk.
- A drive pushed into repeated over current stops can fail.
How error code E d 24 differs from similar codes
E d 24 is current that stays high for too long, while E d 23 is a sharp surge and E d 31 is the overload range reading.
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
Can a lighter load fix E d 24?
It may reduce the drag for a while, but if the drum is stiff when empty, the cause is still there.
Is it a motor or drive problem?
It can be either. The empty drum check and winding tests help separate them.
Will it clear on its own?
Powering off clears the display. A real drag or failing winding brings it back.
Need help with UniMac error code E d 24?
A technician confirms the cause on site and gives you the price in writing before any work starts.