LG Microwave Error Code E-45

E-45 indicates a cooling error related to the Easy or PH humidity sensor. The sensor's output voltage has stayed above 3 volts continuously for 3 minutes during the start of a cooking cycle, which tells the microwave that something is abnormal with the sensor signal. This is most commonly caused by moisture or condensation on the sensor. Opening the microwave door for about 5 minutes to allow drying is the recommended first step.

A simple power reset alone may not permanently resolve E-45 if the underlying cause, such as moisture on the sensor, has not been addressed. The correct reset procedure is to open the microwave door for approximately 5 minutes to dry the sensor area, then attempt to restart the cooking cycle. If the root cause is a failed sensor or wiring fault, the error will return regardless of resets.

If the error is caused only by moisture on the sensor, there is no repair cost since drying the unit resolves the issue. If the humidity sensor itself has failed, parts and labor costs typically range from $75 to $200 depending on the specific model and local labor rates. A control board replacement, if required, is generally the most expensive outcome and can range from $150 to $350 or more including labor.

In many cases, yes. Start by opening the microwave door for 5 minutes to allow any moisture on the humidity sensor to evaporate, then close the door and try running a cooking cycle again. If the error clears and does not return, no further action is needed. If it persists after drying, further diagnosis of the sensor, wiring, or control board is required, which may need a qualified technician.

When the E-45 error is active, the microwave interrupts the cooking process and should not be operated normally until the fault is resolved. Continuing to attempt cooking with a sensor fault present is not recommended, as the appliance cannot accurately monitor internal conditions. Address the error by following the drying procedure first before resuming use.