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Error code reference

Kenmore Dryer Error Code E31

Contact sensor frequency too high, possibly caused by a defective Electronic Control Board or foreign object…

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Contact sensor frequency too high, possibly caused by a defective Electronic Control Board or foreign object interfering with the contact sensor.

First step from the service manual

Check Contact Sensor and wiring. If no problems are found with Contact Sensor, replace Electronic Control Board.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What E31 means on a Kenmore dryer

The E31 error code on a Kenmore dryer indicates that the contact sensor is reporting a frequency that exceeds the acceptable operating range. The contact sensor is responsible for detecting moisture levels in the drum by measuring electrical conductivity as laundry tumbles across two metal sensor bars. When the frequency of electrical contact signals becomes abnormally high, the control board interprets this as a fault condition and triggers the E31 code.

This error has two primary causes: a defective electronic control board or a foreign object interfering with the contact sensor bars inside the drum. A foreign object such as a coin, zipper pull, or small metal item lodged against or between the sensor bars can create a continuous false contact signal, driving the frequency reading above normal thresholds. Lint buildup or residue on the sensor bars can also contribute to abnormal conductivity readings, though a true frequency-too-high fault more commonly points to physical interference or a control board malfunction.

The recommended diagnostic sequence starts with a thorough inspection of the contact sensor bars and their associated wiring. The technician should look for foreign objects in the drum, check the sensor bars for physical damage or contamination, and verify that the wiring harness connecting the sensor to the control board is intact and properly seated. If the sensor and wiring check out without any issues, the electronic control board is the likely source of the fault and should be replaced.

Source: manufacturer service documentation.

Common causes of E31

  1. 01

    Foreign Object on Sensor Bars

    Wiring / connection

    A small metal item such as a coin, zipper pull, or wire can lodge against the sensor bars in the drum and create a constant false contact signal. Inspect the interior of the drum carefully along the sensor bar area for any debris or lodged objects.

  2. 02

    Defective Electronic Control Board

    Part replacement

    If no foreign object or wiring issue is found, the electronic control board itself may be misreading or generating incorrect frequency data from the contact sensor circuit. Replacing the control board is the recommended resolution when all other components check out.

  3. 03

    Contaminated or Coated Sensor Bars

    Wiring / connection

    Fabric softener residue, lint buildup, or other deposits on the metal sensor bars can alter their conductivity and produce abnormal frequency readings. Cleaning the sensor bars with a soft cloth and rubbing alcohol may resolve the issue.

  4. 04

    Damaged or Shorted Sensor Wiring

    Wiring / connection

    A pinched, frayed, or shorted wire in the harness connecting the contact sensor to the control board can cause erroneous high-frequency signals. Inspect the full length of the wiring harness for visible damage and check connector seating.

  5. 05

    Faulty Contact Sensor

    Part replacement

    The contact sensor itself may be defective, producing an out-of-range frequency output even without physical interference. If the wiring and drum interior check out, the sensor should be tested and replaced if it is not operating within normal parameters.

See the test procedure for each cause

Frequently asked questions about E31

What does E31 mean on a Kenmore dryer?
E31 means the dryer's contact sensor is reporting a frequency that is too high, which falls outside the normal operating range. The contact sensor measures moisture in the drum by detecting electrical contact as clothes tumble across sensor bars. This code is typically caused by a foreign object interfering with the sensor bars or a defective electronic control board. The dryer will not complete a normal cycle until the fault is diagnosed and corrected.
How do I fix the E31 error on my Kenmore dryer?
Start by inspecting the inside of the drum for any small metal objects like coins or zipper pulls that may be resting on or between the sensor bars. Clean the sensor bars with rubbing alcohol to remove any residue buildup. If the drum and sensor look clean and undamaged, check the sensor wiring harness for damage or loose connections. If all of those checks come back normal, the electronic control board will likely need to be replaced.
Is it safe to keep using my Kenmore dryer when it shows E31?
It is not recommended to continue running the dryer while the E31 code is active. The contact sensor fault means the dryer cannot accurately measure moisture levels, which could result in clothes running too long or cycles not completing properly. If a foreign metal object is causing the interference, continued operation could also pose a risk to the drum or other components. Address the fault before resuming normal use.
How much does it cost to repair an E31 error on a Kenmore dryer?
The cost depends on the root cause. If cleaning the sensor bars or removing a foreign object resolves the issue, there may be no parts cost at all. If the contact sensor needs replacement, parts and labor typically range from around $50 to $150. Replacing the electronic control board is the more expensive repair, with total costs generally ranging from $150 to $350 depending on the specific model and labor rates in your area.
Will resetting my Kenmore dryer clear the E31 error code?
A power reset by unplugging the dryer for a few minutes may temporarily clear the E31 code, but if the underlying cause is still present the error will return. A foreign object on the sensor bars, a defective control board, or a faulty sensor will continue triggering the fault until the physical problem is corrected. A reset can be useful for confirming whether the error reoccurs, but it is not a fix on its own.

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