UniMac Commercial Washer Error Code E d 25: IPM Over Temperature
E d 25 on a UniMac QN washer-extractor is the IPM over temperature error: the drive's power module got too hot and the cycle stopped. Turn the washer off, give the drive time to cool, and keep the area free of lint. A returning code needs us to clean and test the drive.
Medium: the drive stops to protect itself, and the cause is often lint or heat that can be corrected.
What does UniMac error code E d 25 mean?
The power module in the drive switches heavy current to the motor, and that creates heat. A heat sink and sometimes a fan carry it away. The drive measures the module temperature and halts the cycle when it rises past the limit, which is E d 25. Several things raise it. A drum that does not spin freely, or an overload, makes the drive work harder and generate more heat. Lint packed onto the heat sink acts like a blanket. A warm, poorly ventilated laundry room leaves the drive less margin, which matters in the long summers when rooms stay hot. A cooling fan that is not turning or a heat sink that has stopped cooling has the same effect. The drive needs to cool before it restarts, and cycling power clears the display but not the reason it overheated.
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 25 on the display
- Washer stopping during a heavy extract in a hot room
- Warm air or a burnt smell near the drive cabinet
Possible causes
Listed in UniMac's documentation
- Lint packed onto the drive board heat sink
- A drum dragging or overloaded, making the drive work harder
- A warm, poorly ventilated laundry room around the drive
- A cooling fan not turning or a heat sink not cooling
Other likely causes — what usually sits behind error code E d 25 on this control. A technician confirms which one it is before any part is replaced.
- A room exhaust that is off or undersized for the number of machines running
- Back-to-back heavy loads that never let the drive cool
- A drive cabinet vent covered by stacked linens or carts
Safe checks before calling for service
- Turn the washer off and give the drive time to cool, which also clears the code.
- With power off, feel whether the empty drum turns freely by hand.
- Keep the area around the machine free of lint.
- Move carts and bags away from the cabinet vents.
- A returning E d 25 means we should clean and test the drive.
How a technician diagnoses error code E d 25
- Ask about room temperature, load types and how soon the code returns after a restart.
- With power locked out, inspect the heat sink and fan for lint and blockage.
- Check that the fan turns and is clear.
- Test the drive's temperature sensing against a measured heat sink temperature.
- Check the drum and bearings for drag that adds load.
- Clean the drive, replace a failed fan or module, and run a full cycle.
- Cleaning the heat sink means opening the electrical cabinet near live drive parts.
- The drive stores charge after power is off, and it needs proper discharge before anyone works inside.
- Judging whether the module or its sensor failed needs measurement.
How error code E d 25 differs from similar codes
E d 25 concerns heat in the drive's power module, whereas E d 22 concerns motor temperature.
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
Will a cooler room help?
Yes, better ventilation gives the drive more margin. If the code continues, the drive still needs inspection.
How long should I wait?
Until the drive cabinet is no longer warm. Restarting too early can trip the code again.
Is E d 25 serious?
It is a protective stop. A repeat points to lint, airflow or drag that needs fixing before it damages the module.
Need help with UniMac error code E d 25?
A technician confirms the cause on site and gives you the price in writing before any work starts.