Sharp Microwave Error Code EE8

EE8 indicates that the control board has detected an open circuit in either the exhaust thermistor or the magnetron thermistor. These components monitor temperature during operation, and when one reads an open circuit (infinite resistance), the microwave halts immediately to prevent damage. The oven will not resume operation until the open thermistor is located and replaced.

No. When EE8 is active, the microwave has already stopped itself from operating as a protective measure. You should not attempt to bypass or override this fault. The thermistors exist to prevent overheating of the magnetron and surrounding components, and running the oven without a functioning thermistor circuit could lead to component damage or a fire hazard.

If the repair involves only replacing a thermistor, parts typically cost between $10 and $40 depending on the specific thermistor and where it is sourced. If the repair is done by a professional technician, total labor and parts costs can range from $80 to $200 or more. For older or lower-end microwave models, it is worth comparing the repair cost against the cost of replacement.

A knowledgeable DIYer can diagnose EE8 by checking the thermistor wiring harness connectors for looseness or damage and using a multimeter to test resistance across each thermistor. If one thermistor reads open, it needs to be replaced. Keep in mind that microwave capacitors can store a lethal charge even when unplugged, so the capacitor must be safely discharged before working inside the unit.

Unplugging the microwave briefly may temporarily clear the code display, but EE8 will return as soon as the oven attempts to operate if the underlying thermistor fault has not been repaired. A reset does not fix the open circuit condition in the thermistor or its wiring. The fault must be diagnosed and the defective component repaired or replaced.