Huebsch Washer Error Code E oP: Open Temperature Sensor
E oP on Huebsch Quantum frontloads, QN and CHM495R washer-extractors means the temperature sensor circuit reads open, as if the thermistor were disconnected or broken. Open the door or press any key to clear the message, as the QN manual says, and note whether the wash water is cooler than it should be. If E oP comes back, we can schedule service.
Medium: the machine keeps washing, but without heat until the sensor circuit is repaired.
What does Huebsch error code E oP mean?
The temperature sensor is a thermistor, and the control reads its resistance to know the water temperature. When the circuit reads open, the control sees what looks like a disconnected or broken sensor and displays "E oP". On heated machines it turns the heater off and the cycle continues, with the message shown at the end of the cycle on the QN models. The CHM495R manual describes it as the control sensing below 0 F, which is the same open-circuit reading seen as extreme cold. Customers see lukewarm washes or none at all. The manual's list covers a thermistor that is unplugged or broken inside its connector, a broken wire between the sensor and the control, and a heater that is also not drawing current as expected, which would explain why the water never warmed.
Affected models and control systems
This page covers Huebsch Quantum frontload washers in the FLW1535C family, QN washer-extractors with the CHM1792C control and CHM495R-family washer-extractors, 20 to 100 lb, with heat.
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
- Washes are lukewarm or not heated at all
- "E oP" shown at the end of the cycle on QN models
- The cycle itself completes normally
Possible causes
Listed in Huebsch's documentation
- Thermistor unplugged or broken inside its connector
- Broken wire between the temperature sensor and the control
- Heater not drawing current as expected
Other likely causes — what usually sits behind error code E oP on this control. A technician confirms which one it is before any part is replaced.
- A sensor connector pushed apart during recent servicing of the machine
- A wire fatigued at a bend near the sensor after years of vibration
Safe checks before calling for service
- Open the door or press any key to clear the message, as the QN manual says.
- Note whether wash water is coming out cooler than it should.
- Do not pull any sensor plug yourself.
- If E oP comes back, we can schedule service. Tell us which programs use heat.
How a technician diagnoses error code E oP
- Read the code and see which models of control are involved.
- Measure the thermistor resistance at the sensor.
- Inspect the connector and trace the wire to the control.
- Check heater current to see whether the heater was commanded.
- Replace the sensor or repair the wire only after the readings confirm it.
- Measuring the sensor circuit means working in the machine with the heater circuit live.
- Heater current checks involve high-voltage wiring.
- Knowing the correct resistance for a sensor needs the manufacturer's values.
How error code E oP differs from similar codes
E oP is an open sensor circuit. The CHM495R describes the same condition as sensing below 0 F, while E Ht is a heater that simply fails to reach temperature.
Technical reference
- Document
- Commercial Frontload Washers Troubleshooting FLW1535C, Part No. 803402R2, March 2016, Section 4 Table 3 (pp. 18-20)
- Edition
- Part No. 803402R2, March 2016
- Models / control
- Quantum frontload (FLW1535C family) electronic control; CHM1792C family washer-extractor (QN models, 20-100 lb) front-end control; CHM495R family washer-extractor front-end control (20-100 lb)
- Section
- Section 4 Electronic Control Troubleshooting - 8. Error Code Listing, Table 3, printed pp. 18-20 (PDF pp. 20-22)
- 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 Huebsch washer error codes
Can I keep washing with E oP?
The cycle continues, but with the heater off, so heated programs will underperform.
Why does it say below 0 F on one machine?
The CHM495R manual describes the open circuit that way.
Is E oP the heater itself?
Not directly. It points to the sensor circuit, though the manual also mentions a heater not drawing current.
Need help with Huebsch error code E oP?
A technician confirms the cause on site and gives you the price in writing before any work starts.