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Error code reference

Frigidaire Washer Error Code E31

Moisture sensor fault

Frigidaire codesFrigidaire washer codes

Moisture sensor fault — main board defective, short across sensor bars, wiring open, bars contacting bulkhead, or foreign object interfering with contact sensors (models with moisture bars only).

First step from the service manual

Check contact sensors for foreign objects and wiring. If no problems found, check wiring (quick connect at moisture bars and/or edge connector J3). If that doesn't fix the problem, replace the 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 Frigidaire washer

The E31 error code on a Frigidaire washer indicates a moisture sensor fault. This code applies specifically to models equipped with moisture sensor bars, which are contact-style sensors used to detect the presence and level of moisture inside the drum. The control board monitors the electrical signal across these sensor bars. When that signal falls outside the expected parameters, whether due to an open circuit, a short circuit, or physical interference at the sensor contact points, the board registers E31 and halts normal operation.

Several conditions can trigger this fault. A short circuit across the sensor bars is one possibility, as is an open wire in the sensor circuit. Physical interference is another common cause: foreign objects lodged between the sensor bars and the drum surface can disrupt the contact, and the bars themselves may be misaligned and contacting the bulkhead instead of operating freely. Wiring issues are also implicated, particularly at the quick connect terminals located at the moisture bars and at edge connector J3 on the control board.

Diagnosis begins at the sensor bars themselves. A visual inspection for foreign objects and debris should be the first step, followed by a check of the wiring connections at both the moisture bars and connector J3. If the wiring and sensors check out physically, the fault may originate at the electronic control board, which can develop internal defects that cause it to misread or fail to read the sensor signal correctly. In that case, board replacement is the recommended corrective action.

Source: manufacturer service documentation.

Common causes of E31

  1. 01

    Foreign object interfering with sensor bars

    Wiring / connection

    Small items such as coins, clips, or debris can lodge between the moisture sensor bars and the drum surface, disrupting the electrical contact the sensors need to function. A visual inspection of the sensor bar area inside the drum will usually reveal this.

  2. 02

    Loose or faulty wiring connection

    Wiring / connection

    An open or poorly seated wire at the quick connect terminals on the moisture bars or at edge connector J3 on the control board can break the sensor circuit. Check both connection points for corrosion, looseness, or wire damage.

  3. 03

    Sensor bars contacting the bulkhead

    Wiring / connection

    If the moisture sensor bars are misaligned, they may physically contact the drum bulkhead rather than operating in their intended position. This can create a short or prevent proper sensor readings and requires physical inspection and realignment.

  4. 04

    Short circuit across the sensor bars

    Part replacement

    A short circuit directly across the moisture sensor bars can cause the control board to receive an out-of-range signal and trigger E31. This may result from wiring damage, moisture intrusion at a connector, or contact between sensor leads.

  5. 05

    Defective electronic control board

    Part replacement

    If the sensor bars, wiring, and connectors all check out without issue, the control board itself may be internally defective and misreading or failing to process the moisture sensor signal. Board replacement is the indicated fix when all other causes are ruled out.

See the test procedure for each cause

Frequently asked questions about E31

What does E31 mean on a Frigidaire washer?
E31 indicates a moisture sensor fault on Frigidaire washers equipped with contact-style moisture sensor bars. The error means the control board is detecting an abnormal signal from the sensor circuit, which can be caused by a foreign object near the bars, a wiring problem, sensor bar misalignment, a short circuit, or a defective control board. This code only appears on models that include moisture bar sensors.
Can I fix the E31 error myself without replacing parts?
In many cases, yes. Start by inspecting the moisture sensor bars inside the drum for any debris or foreign objects that may be interfering with the contacts. Also check that the wiring connections at the moisture bars and at edge connector J3 on the control board are fully seated and undamaged. These steps require no parts and resolve a good portion of E31 faults.
Will resetting the washer clear the E31 error code?
A reset may temporarily clear the code, but if the underlying fault is still present, E31 will return once the washer runs through its cycle and the control board checks the moisture sensor again. A reset is not a fix. The root cause must be identified and corrected to permanently resolve the error.
Is it safe to use my Frigidaire washer while the E31 code is showing?
It is generally not recommended to continue running the washer with an active E31 fault. The moisture sensor plays a role in how the machine manages drying-related functions, and operating with a faulty sensor signal can lead to incomplete cycles or further stress on the control board. Diagnose and resolve the fault before resuming regular use.
How much does it cost to fix the E31 error on a Frigidaire washer?
If the fix involves only clearing a foreign object or reseating a wire connector, the cost can be minimal or nothing beyond your time. If a wiring harness repair is needed, costs will vary by the extent of the damage. If the electronic control board requires replacement, expect to spend anywhere from $150 to $350 or more depending on the specific model and whether you use a professional technician or handle the repair yourself.

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