Whirlpool Microwave Error Code NTC OPEN, CALL FOR SERVICE

This error code means the control board has detected an open circuit in the hood NTC thermistor circuit. The thermistor is a temperature sensor in the hood section of the microwave that should measure approximately 10K ohms at room temperature. When the circuit reads as open, the board cannot receive a valid temperature signal and shuts down the unit. The fault must be diagnosed and repaired before the microwave will operate again.

Unplugging the microwave and restoring power may temporarily clear the display, but the error code will return immediately if the underlying open circuit condition still exists. The fault is not a random software glitch. The only way to permanently clear the code is to repair or replace the faulty thermistor or wiring causing the open circuit.

Repair costs vary depending on whether the issue is a wiring problem or a failed thermistor. A replacement thermistor is generally an inexpensive part, typically in the range of $10 to $40 depending on the model. If a technician performs the diagnosis and repair, labor costs will add to that total, with overall repair estimates commonly ranging from $80 to $200. If the control board is the root cause, costs will be higher.

A knowledgeable DIYer can perform the initial diagnosis by unplugging the unit and using a multimeter to check the thermistor resistance against the 10K ohm specification. If the wiring or connector is simply disconnected, reattaching it may resolve the issue without new parts. However, if the thermistor itself has failed or wiring is damaged inside the hood assembly, the repair involves disassembling the unit and sourcing the correct replacement part, which many homeowners prefer to leave to a technician.

No. The hood thermistor is part of the appliance's thermal monitoring system. When this error is active, the microwave has disabled itself because it cannot confirm safe operating temperatures in the hood area. Attempting to bypass or ignore this fault and continue using the unit is not recommended, as the appliance cannot properly detect overheating conditions.