Sharp Microwave Error Code EE29

EE29 indicates a fault in the exhaust thermistor circuit. The control board has detected that the thermistor responsible for monitoring exhaust air temperature is either open (no continuity) or shorted (abnormally low resistance). The microwave disables itself when this fault is detected to prevent unsafe operating conditions.

No. The EE29 fault indicates the exhaust temperature monitoring system is not functioning correctly. Operating the microwave without a working exhaust thermistor removes a key safeguard against overheating. The unit should remain out of service until the fault is diagnosed and repaired.

If only the exhaust thermistor needs replacement, parts typically cost in the range of $10 to $40 depending on the specific model. If professional labor is involved, total repair costs generally range from $75 to $175. In cases where the control board is at fault, repair costs can be higher and it may be worth comparing the repair cost against the cost of a replacement unit.

A knowledgeable DIYer comfortable working with appliance electronics can diagnose and replace the exhaust thermistor. The process involves disconnecting power, accessing the exhaust thermistor, testing it with a multimeter, and replacing it if readings are out of range. However, microwave capacitors can retain a lethal charge even when unplugged, so discharge procedures must be followed before working inside the unit.

Unplugging the microwave and restoring power may temporarily clear the displayed code, but the fault will return if the underlying hardware problem is not resolved. The exhaust thermistor or its wiring must be inspected and repaired or replaced to permanently clear the error.