Kenmore Refrigerator Error Code Er 3

Er 3 indicates an abnormal signal from Refrigerator Sensor 1, the primary temperature sensor in the refrigerator compartment. The control board has detected either an open circuit (broken or cut wire) or a short circuit in that sensor's circuit. The first step is to check the wiring connector at CON7 for a loose or corroded connection before replacing any parts.

The refrigerator may continue to run in a limited capacity, but without accurate temperature feedback the compartment could become too warm or too cold without warning. It is best to monitor food temperatures closely and address the fault as soon as possible to avoid food spoilage. Do not rely on the refrigerator to maintain safe food temperatures until the sensor circuit is repaired.

If the fix is simply reseating a loose connector at CON7, there is no parts cost involved. If the primary temperature sensor needs replacement, parts typically range from around 20 to 60 dollars depending on the specific model. Adding professional labor for diagnosis and replacement can bring the total repair cost to somewhere between 100 and 250 dollars, though costs vary by region and service provider.

Start by locating and inspecting connector CON7 in the wiring harness. Unplug it, check for corrosion or bent pins, and reseat it firmly. If the error returns, test the resistance of the primary refrigerator temperature sensor and inspect the wiring harness for any cuts, pinches, or shorts. If the sensor reads out of range, replacing it should clear the fault.

A power reset may temporarily clear the display, but if the underlying fault in the sensor circuit remains, the Er 3 code will return once the control board runs its diagnostics again. A permanent fix requires correcting the wiring connection or replacing the faulty sensor. Resetting without repair is not a long-term solution.