Kenmore Refrigerator Error Code R1 R3 ON

The R1 R3 ON code indicates that the refrigerator compartment temperature sensor circuit has an open or short circuit condition. The control board monitors sensor resistance to track internal temperatures, and this code appears when one or more sensors return a reading outside the acceptable range. It is a diagnostic alert that requires checking each sensor and its associated wiring individually.

Continuing to run the refrigerator with this error is not recommended for extended periods, because the control board cannot accurately regulate the compartment temperature without reliable sensor input. Food safety may be at risk if temperatures rise or cycle incorrectly. Address the fault as soon as possible to ensure the unit is maintaining safe storage temperatures.

A power reset may temporarily clear the code, but if the underlying sensor or wiring fault still exists, the error will return once the control board runs its diagnostic checks again. A reset is useful for confirming whether the fault is intermittent or persistent, but it does not fix the physical problem. Proper diagnosis and repair of the sensor circuit are required to resolve the code permanently.

Start by inspecting the wiring harness and connectors for each refrigerator compartment sensor, looking for broken wires, loose pins, or corrosion. Use a multimeter to measure the resistance of each thermistor and compare it to the expected value at the current temperature. If a sensor reads open or shorted, replacing that sensor is typically the fix. If sensors and wiring test normal, the control board may need further evaluation.

Repair costs vary depending on the root cause. A replacement thermistor sensor is generally an inexpensive part, with DIY costs typically in the range of $10 to $40 for the component. If professional labor is involved, total repair costs including diagnosis and parts can range from $100 to $250 or more. A control board replacement, if needed, will push costs higher.