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Error code reference

Jenn-Air Refrigerator Error Code F3E8

RH (Humidity) Sensor is not working.

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RH (Humidity) Sensor is not working.

First step from the service manual

Run Test 104 for RH Sensor; if sensor reads bad, check wiring connections between sensor and HV Board.

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

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What F3E8 means on a Jenn-Air refrigerator

The F3E8 error code on a Jenn-Air refrigerator indicates that the relative humidity (RH) sensor is not functioning correctly. This sensor is responsible for monitoring moisture levels within the refrigerator cavity, providing feedback to the High Voltage (HV) Board so the system can regulate conditions that affect food preservation and frost management. When the HV Board cannot receive a valid signal from the RH sensor, it flags the F3E8 fault and may alter or disable humidity-dependent functions.

The diagnostic process begins with running Test 104, which is specifically designed to evaluate the RH sensor's output. If Test 104 confirms the sensor is reading bad, the next step is to inspect the wiring connections between the sensor and the HV Board. Loose connectors, corroded terminals, or damaged wiring along that circuit are common culprits before concluding the sensor itself has failed. A wiring fault can mimic a failed sensor entirely, so the connection inspection is a critical intermediate step.

If wiring checks out and the sensor still reads bad through Test 104, the RH sensor itself is likely defective and will need replacement. Because this code involves the HV Board as the receiving component, technicians should also consider whether the HV Board has a damaged input circuit, though sensor and wiring failures are the more probable causes. Addressing this code promptly helps ensure the refrigerator maintains proper internal conditions and prevents related issues with moisture control.

Source: manufacturer service documentation.

Common causes of F3E8

  1. 01

    Loose or disconnected wiring connector

    Wiring / connection

    The wiring connector between the RH sensor and the HV Board may have come loose or become partially disconnected. This is the first thing to check after a failed Test 104 result, as it can cause the same fault symptoms as a completely failed sensor.

  2. 02

    Failed RH sensor

    Part replacement

    The RH sensor itself may have failed internally, causing it to output an invalid or no signal to the HV Board. Confirmed by a bad reading during Test 104 after wiring connections have been verified as secure.

  3. 03

    Corroded or damaged wiring terminals

    Wiring / connection

    Moisture exposure inside the refrigerator can corrode the terminals on the sensor connector or along the wiring harness, creating high resistance or an open circuit. Inspect terminals closely for discoloration, pitting, or oxidation.

  4. 04

    Damaged wiring harness

    Part replacement

    The wire run between the RH sensor and the HV Board may have a break, pinch, or abrasion causing an intermittent or permanent open circuit. Carefully trace the harness for any visible damage.

  5. 05

    Faulty HV Board input circuit

    Part replacement

    If the sensor and all wiring check out as good, the input circuit on the HV Board that reads the sensor signal may be damaged. This is the least common cause but should be considered after ruling out the sensor and wiring.

See the test procedure for each cause

Frequently asked questions about F3E8

What does F3E8 mean on a Jenn-Air refrigerator?
F3E8 means the relative humidity sensor is not working or is sending an invalid signal to the High Voltage Board. The refrigerator uses this sensor to monitor moisture levels inside the cabinet. The fault triggers when the HV Board cannot receive a usable reading from the sensor. Diagnosis starts with running Test 104 to evaluate the sensor, followed by checking the wiring connections if the sensor reads bad.
Can I fix the F3E8 error myself?
A knowledgeable DIYer can inspect the wiring connector between the RH sensor and the HV Board for loose or corroded connections, which is the first recommended step after a failed Test 104. However, running Test 104 itself typically requires access to the service diagnostic mode, and replacing the HV Board involves working near high-voltage components. If you are not comfortable with appliance electronics, having a qualified technician handle the repair is advisable.
Is the F3E8 error on my Jenn-Air refrigerator a safety hazard?
The F3E8 fault is not a direct safety hazard in the way that a gas leak or electrical short would be. However, a non-functioning humidity sensor means the refrigerator cannot properly regulate moisture levels, which could affect food preservation over time. The refrigerator will typically continue running, but internal conditions may not be optimal until the fault is resolved.
How much does it cost to repair the F3E8 error on a Jenn-Air refrigerator?
Repair costs depend on what component has failed. If only a wiring connector needs reseating or cleaning, the cost may be limited to a service call fee, typically in the range of $75 to $150. Replacing the RH sensor itself is generally a lower-cost part repair, while replacing the HV Board is more expensive, with parts and labor combined potentially ranging from $200 to $500 or more depending on your location and the specific model.
Will resetting my Jenn-Air refrigerator clear the F3E8 error code?
A power reset may temporarily clear the F3E8 code, but it will return if the underlying cause is not repaired. Because the fault is tied to an active sensor failure or wiring issue, the HV Board will detect the problem again once the refrigerator resumes normal operation. A proper repair, confirmed through Test 104, is required to permanently resolve the error.

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