UniMac Washer-Extractor Error Code E d 22: Over Motor Temperature
E d 22 means the motor on a UniMac QN washer-extractor ran hotter than the drive tolerates. Power down, let the motor cool, and do not overload the next batch. Call us if it comes back.
High: the machine stops until the motor cools, and a repeat points to drag or overheating that can damage the motor.
- Code
- E d 22
- Maker
- UniMac
- Equipment
- Industrial laundry
- Applies to
- CHM1792C family washer-extractor (QN models, 20-100 lb) front-end control
What does UniMac error code E d 22 mean?
E d 22 is the over motor temperature error on a UniMac QN washer-extractor such as the UCA020QN. The drive keeps track of how hot the motor is. It then compares that reading against a limit. If the motor runs hotter than the limit, the drive ends the cycle at once to protect the motor windings from damage.
Most of the time a motor gets this hot because it works too hard or cannot shed heat. A drum that does not turn freely, from dragging bearings, makes it work harder. An overloaded drum does the same. Poor airflow around the motor, from dust or blocked vents, keeps the heat in. A damaged motor harness can also overheat or give a wrong temperature reading to the drive.
A hot motor needs time to cool before the next batch. Powering the machine down clears the code, but starting another heavy load straight away will usually bring the code back. The display shows E d 22 until power is cycled.
Affected models and control systems
E d 22 is listed for the CHM1792C family, QN washer-extractors from 20 to 100 lb, with the front-end control and drive board. The 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 d 22 and the drum stops
- The motor housing is hot to the touch from outside
- The drum feels stiff or noisy when turned by hand
- The code appears after several heavy loads in a row
Possible causes
Listed in UniMac's documentation
- A drum or bearings that drag and make the motor work harder
- An overloaded drum that pushes the motor past its normal load
- Poor airflow around the motor from dust or blocked vents
- A damaged motor harness that overheats or misreads motor temperature
Other likely causes — what usually sits behind error code E d 22 on this control. A technician confirms which one it is before any part is replaced.
- Lint and dust packed around the motor cooling fins behind the machine
- Back-to-back full-size loads with no cool-down between batches
- Worn drum bearing with rough rotation that adds constant drag
- Temperature sensor lead in the motor harness chafed so it reads high
Safe checks before calling for service
- Power the machine down to clear the code and let the motor cool.
- With power off and the drum still, check that the empty drum turns freely by hand, without forcing it.
- Check the motor harness only by eye, from outside.
- Do not overload the next batch. If E d 22 returns, note how many loads ran before it and call us.
How a technician diagnoses error code E d 22
- Read the code and ask how many loads ran before it appeared.
- Let the motor cool, then check drum rotation and bearing noise by hand with power locked out.
- Inspect motor ventilation and clean lint from the motor and drive area.
- Check the motor harness, connector and temperature lead for damage.
- Measure motor winding resistance and compare the temperature reading with a thermometer.
- Replace bearings, harness or motor only after the readings point to them.
- Cleaning around a hot motor and checking its winding resistance needs the cabinet open and the machine locked out.
- A dragging drum may be a bearing job that needs the basket supported and special tools.
- The motor temperature reading can only be proven right or wrong with a meter and a reference thermometer.
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 industrial laundry error codes
How long should I wait before restarting?
Long enough for the motor to feel cool to the hand. The manual does not give a figure, so a short wait may not be enough.
If it clears, can I ignore it?
Not if it returns. A repeat usually means drag, overloading or poor airflow, and the motor is being stressed each time.
Is E d 22 the same as E d 25?
No. E d 22 is the motor running hot, while E d 25 is the drive's power module running hot.
Need help with UniMac error code E d 22?
A technician confirms the cause on site and gives you the price in writing before any work starts.