Jenn-Air Cooktop Error Code Er 36

Er 36 on a Jenn-Air cooktop indicates that the NTC (Negative Temperature Coefficient) thermistor is reading a voltage value outside its acceptable operating range. Specifically, the control unit detects a signal below 200 mV or above 4.9 V on the NTC circuit. An NTC thermistor is a temperature-sensing resistor whose resistance decreases as temperature rises. The control board uses the voltage produced by this sensor to monitor cooktop temperature and regulate heating elements safely. When the signal falls outside the valid window, the control unit interprets this as either a short circuit or an open circuit (cut-off) condition in the NTC, and it shuts down operation as a protective measure.

The two failure conditions captured by this code represent opposite electrical faults. A reading below 200 mV typically points to a short circuit in the NTC sensor or its wiring, where resistance has dropped abnormally low. A reading above 4.9 V typically indicates an open circuit, meaning the sensor wire is broken or the sensor itself has failed open, causing the voltage to float near the supply rail. Both conditions make accurate temperature monitoring impossible, so the control unit cuts power to prevent overheating or component damage.

The primary diagnostic step specified for this code is to disconnect power, replace the cooktop UI (user interface) board, reassemble all components and panels, and then restore power. This approach suggests that in many cases the fault originates in the control board circuitry that processes the NTC signal, rather than the sensor itself. However, the NTC sensor and its associated wiring harness should also be inspected for damage, corrosion, or loose connectors before committing to a board replacement.