LG Range Error Code E-28

E-28 on an LG range means the oven temperature sensor has a shorted circuit condition, with resistance measuring below 100 ohms. The normal resistance for this sensor at room temperature is approximately 1080 ohms. Because the control board cannot read a valid temperature from a shorted sensor, it triggers this error and typically disables oven operation to prevent overheating.

Resetting the range by disconnecting power briefly may temporarily clear the error code display, but the code will return immediately once power is restored if the shorted sensor or wiring fault is still present. The underlying hardware fault must be repaired before the error will stay cleared.

If the oven temperature sensor is the failed component, replacement sensor parts typically cost in the range of $20 to $60 depending on the specific model. If you hire a technician, expect total repair costs including labor to fall in the range of $100 to $250. Wiring harness damage or a faulty control board would increase costs significantly beyond that range.

A knowledgeable DIYer can diagnose E-28 by disconnecting power, removing the upper rear cover panel, and measuring sensor resistance with a multimeter. If the sensor reads well below 100 ohms, replacing the oven temperature sensor is a straightforward repair that typically involves disconnecting the wiring harness and removing one or two mounting screws. However, if the fault is in the wiring harness or control board, the repair becomes more complex and may warrant professional service.

You should not attempt to use the oven while E-28 is active. A shorted temperature sensor means the control board has no reliable way to regulate oven temperature, which creates a risk of uncontrolled overheating. Surface burners on a gas or electric range may still be usable, but the oven should remain off until the fault is repaired.