Wolf Cooktop Error Code E55

Error code E55 on a Wolf cooktop indicates that the heat sink thermistor on Generator 3 has detected a shorted condition, causing the affected burner to shut down as a protective measure. The heat sink thermistor is a temperature-sensing resistor mounted directly to the generator board's heat sink. Its job is to monitor thermal conditions at the heat sink and signal the control system if temperatures fall outside safe operating parameters. A shorted thermistor sends an out-of-range resistance reading to the control board, which the system interprets as a fault condition and responds to by disabling that burner circuit entirely.

The generator board itself is the power conversion unit responsible for driving the induction burner. Each burner on the cooktop has a dedicated generator, and each generator has its own thermistor for independent thermal monitoring. When E55 appears, the fault is specific to Generator 3 and does not affect the remaining burners. The thermistor short can result from physical damage to the sensor, a wiring fault in the thermistor circuit, or internal failure of the generator board itself.

Diagnosis begins with performing Heatsink Test 4, which evaluates the condition of the heat sink and associated thermistor circuit. If the test results appear normal, the error can be reset and the cooktop tested under normal operating conditions. If the error returns after reset, the generator board for the affected burner is considered faulty and requires replacement. This structured test-first approach helps distinguish between a transient fault and a genuine component failure before committing to a parts replacement.