UniMac Washer Error Code E tE: Maximum Water Temperature
E tE on a UniMac QN washer-extractor means the control sensed water hotter than its upper limit and limited or stopped heating. Shut the machine off and let everything cool before touching anything. If E tE returns, a technician should check the sensor, the heating contactor and the supply temperature.
High: the control limits heating to protect the machine, and genuinely hot water may be involved.
What does UniMac error code E tE mean?
E tE is the maximum water temperature error on UniMac QN washer-extractors such as the UCA020QN. The control reads the water temperature sensor throughout the wash and compares the reading with an upper limit built into the program. When the sensed water is hotter than that limit, the control stops or limits heating to protect the machine and the linens, and it displays E tE. The code says the control believes the water is too hot, and that can be literally true or can be a wrong reading. An element that never switches off, a contactor stuck closed, or a sensor that reads higher than the real temperature can each lie behind it. Very hot supply water can also push the tub past the limit without any heater problem. Because there may be genuinely hot water and steam in the tub, the sensible first step is to let the machine cool and keep the door shut.
Affected models and control systems
Listed for the CHM1792C family of UniMac QN washer-extractors (20-100 lb), with the UCA020QN as the example. It is a front-end control message.
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 tE on the display and heating stopped
- Water in the tub that feels or looks too hot
- Steam at the door or vent during a hot wash
- Cycle ends early or will not continue until the machine cools
Possible causes
Listed in UniMac's documentation
- Water temperature sensor reading higher than the real temperature
- Heating contactor stuck closed, so the element never switches off
- Very hot supply water pushing the tub past its upper limit
Other likely causes — what usually sits behind error code E tE on this control. A technician confirms which one it is before any part is replaced.
- Building water heater turned up high, so the hot inlet alone exceeds the program's limit
- Scale on the heating element delaying shutoff after the contactor opens
- Sensor drifting with age on a machine that runs hot washes all day
Safe checks before calling for service
- Shut the machine off and let everything cool down.
- Keep the door shut while the drum is still hot.
- Check the building hot water setting if you can do so safely.
- If E tE returns, call us.
- Note which wash temperature was selected and how hot the supply water runs.
How a technician diagnoses error code E tE
- Read the code and compare the displayed water temperature with a thermometer reading from the tub.
- Measure the temperature of the hot supply at the inlet.
- With power locked out, test the sensor resistance against the manual's chart.
- Check the heating contactor and element circuit for a contactor that sticks closed.
- Replace the sensor or contactor only after the readings confirm it, then run a hot wash and watch the temperature stop at its setpoint.
- Heating contactors and elements switch 208-240 V or more, and a stuck contactor can only be confirmed with live measurements.
- Hot water and steam in the tub make opening the door or draining the machine a burn risk.
- A high sensor reading and a truly overheated tub look the same on the display, so a thermometer and meter are needed to tell them apart.
How error code E tE differs from similar codes
E tE is about water that is too hot. The sensor circuit codes E oP and E SH describe a sensor that is open or shorted, not a high real 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
Is the water really too hot when E tE shows?
It can be, so treat it that way until it has cooled. A technician confirms with a thermometer whether the sensor or the heating is the cause.
Can I keep washing with E tE?
Not on hot cycles. Wait for the check, because an element that does not switch off can damage linens and the machine.
Could my building water heater cause E tE?
Yes, if the supply is hot enough on its own. Lowering the building setting may help, but only if it can be done safely.
Need help with UniMac error code E tE?
A technician confirms the cause on site and gives you the price in writing before any work starts.