What Do Monogram Washer Error Codes E66 and E67 Mean?
The E66 and E67 error codes on a Monogram washing machine indicate a temperature sensor (thermistor) malfunction. The temperature sensor monitors water temperature in the wash tub, allowing the control board to regulate heating and verify that water is within the expected temperature range. When the sensor provides readings outside the expected range, these codes are triggered.
Common Causes of the E66 / E67 Error Codes
- Failed temperature sensor (thermistor) – The thermistor’s internal resistance element has failed, producing out-of-range readings.
- Disconnected thermistor wiring – The sensor connector has come loose from the control board or sensor itself.
- Thermistor contaminated – In some cases, detergent buildup on the sensor element can affect readings.
How to Troubleshoot the E66 / E67 Error Codes
- Reset the washer – Unplug for 60 seconds and retry. A temporary glitch can cause false thermistor readings.
- Test hot water temperature – Run hot water at a nearby sink. If extremely hot (above 140°F) or cold, this could affect sensor readings.
- Check thermistor resistance – A technician can test the thermistor’s resistance with a multimeter — it should follow a predictable curve with temperature.
When to Call a Professional
If E66 or E67 persists, the thermistor likely needs replacement. Contact our Monogram washer repair team at 844-752-7887 for professional diagnosis and replacement using factory-certified Monogram parts.