LG Dishwasher Error Code E7

E7 means the control board has detected an open circuit in the thermistor, which is the temperature sensor that monitors wash water temperature. An open circuit means the electrical path through the sensor or its wiring is completely broken, so no temperature signal is reaching the board. The dishwasher stops operation in any mode when this fault is present to prevent running a cycle without valid temperature data.

You should not continue running the dishwasher while E7 is active. Without a working temperature sensor, the control board cannot regulate water heating accurately, which can result in inadequate sanitization or uncontrolled heater operation. The dishwasher will typically halt on its own, but attempting to force cycles through the fault is not advisable.

Repair costs depend on which component is at fault. If the fix is just reseating a loose connector, there is no parts cost and only a service call fee if a technician is involved, typically ranging from $75 to $150. A replacement thermistor is a relatively inexpensive part, with parts and labor often falling in the $100 to $200 range. A control board replacement is the most expensive scenario, with total repair costs potentially ranging from $200 to $400 or more depending on the specific board and labor rates in your area.

In many cases, yes. Start by pulling the dishwasher out enough to access the thermistor connector and confirm it is fully seated with no corroded pins. If the connector is secure, a knowledgeable DIYer comfortable with a multimeter can test the thermistor resistance and check harness continuity. Replacing a thermistor is generally a straightforward parts swap, but if the control board is at fault, that repair is more involved and may be better handled by a technician.

A power reset, done by unplugging the unit or tripping the circuit breaker for about 30 seconds, may temporarily clear the code if it was triggered by a transient connection issue. However, if the underlying fault in the thermistor circuit still exists, the E7 error will return as soon as the dishwasher runs again. A reset alone is not a repair and should be followed by a proper inspection of the connector and sensor.