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Error code reference

Kenmore Refrigerator Error Code rt

RT (room temperature/ambient) sensor is read as open or shorted.

Kenmore codesKenmore refrigerator codes

RT (room temperature/ambient) sensor is read as open or shorted.

First step from the service manual

Check the wiring connections in each part and at Main PCB.

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

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What rt means on a Kenmore refrigerator

The RT error code on a Kenmore refrigerator indicates that the room temperature (ambient) sensor has been detected as either open or shorted. This sensor monitors the ambient temperature surrounding the refrigerator, which the main control board uses to adjust cooling cycles, fan operation, and energy usage based on environmental conditions. When the sensor circuit reads outside the expected resistance range, the main PCB flags the fault and displays the RT code.

An open circuit condition means the sensor or its wiring has a break, resulting in no continuity through the circuit. A shorted condition means two points in the circuit that should be electrically isolated are making contact, causing resistance to drop near zero. Both conditions produce readings that fall outside the normal operating range of the ambient sensor, which is typically a thermistor that changes resistance predictably with temperature.

The most common sources of this fault are loose or corroded wiring connections at the sensor itself or at the main PCB connector. Physical damage to the wiring harness, such as pinched or broken wires, can also produce either an open or shorted reading. In some cases, the sensor itself has failed internally. The diagnostic process should begin with a thorough inspection of all wiring connections between the ambient sensor and the main control board before replacing any components.

Source: manufacturer service documentation.

Common causes of rt

  1. 01

    Loose or disconnected wiring connections

    Wiring / connection

    The wiring connector at either the ambient sensor or the main PCB may be loose, unseated, or corroded. Inspecting and reseating all connectors in the circuit is the recommended first step.

  2. 02

    Damaged wiring harness

    Part replacement

    The wire harness running between the RT sensor and the main PCB may be pinched, cut, or broken, creating an open circuit. Visually trace the harness and use a multimeter to check for continuity.

  3. 03

    Failed ambient temperature sensor

    Part replacement

    The thermistor element inside the RT sensor may have failed internally, causing it to read as open or shorted regardless of the wiring condition. If wiring checks out, measure the sensor resistance and compare it to the expected value at the current ambient temperature.

  4. 04

    Corroded connector terminals

    Wiring / connection

    Moisture or oxidation at the wiring connector terminals can increase resistance or interrupt the circuit entirely. Inspect terminals closely for green or white corrosion and clean or replace affected connectors.

  5. 05

    Faulty main PCB

    Part replacement

    If the sensor and all wiring check out correctly, the main control board itself may have a failed input circuit that is misreading the sensor signal. This is the least likely cause and should be diagnosed only after ruling out all other possibilities.

See the test procedure for each cause

Frequently asked questions about rt

What does rt mean on a Kenmore refrigerator?
The RT code means the room temperature, or ambient, sensor has been detected as open or shorted by the main control board. This sensor monitors the surrounding air temperature so the refrigerator can adjust its operation accordingly. The fault indicates the sensor circuit is either broken or has an unintended electrical connection. The first step is to check all wiring connections at the sensor and at the main PCB.
Can I fix the RT error code myself?
In many cases, yes. Start by unplugging the refrigerator and inspecting the wiring connections between the ambient sensor and the main PCB, reseating any loose connectors. If connections look good, use a multimeter to test the sensor for proper resistance and check the harness for continuity. If a damaged wire or failed sensor is found, those are parts a DIYer with basic electrical skills can often replace.
Is it safe to use my refrigerator when the RT code is showing?
The refrigerator may still run while displaying this code, but it cannot accurately optimize its operation without a functioning ambient sensor. Food safety depends on whether the refrigerator is still maintaining proper internal temperatures. Monitor the interior temperature closely and if cooling appears affected, minimize the time the code goes unresolved.
Will resetting the refrigerator clear the RT error code?
A reset may temporarily clear the code, but it will return if the underlying fault in the sensor circuit has not been corrected. Unplugging the unit for a few minutes and restoring power can reset the board, but the code will reappear as soon as the control board detects the open or shorted sensor condition again. A lasting repair requires diagnosing and correcting the wiring or sensor issue.
How much does it cost to repair the RT error code on a Kenmore refrigerator?
Repair costs vary depending on the root cause. If only a wiring connection needs to be reseated or cleaned, the cost may be minimal or limited to a service call fee, typically in the range of $75 to $150. Replacing the ambient sensor itself usually costs between $20 and $60 for the part, plus labor if a technician is used. A main PCB replacement is the most expensive scenario, generally ranging from $150 to $400 or more depending on the model.

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