Gaggenau Runaway heating / sensor feedback failure

Oven overheats, burning food even at low settings, no error code displayed

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Shorted temperature sensor, Sensor not properly mounted to cavity, Stuck heating relay on control board, Shorted triac driving element

How to Fix / Troubleshooting

Safety: Immediately switch off the oven and disconnect power. Do not continue using the oven until the fault is corrected.

  • Sensor inspection: Verify that the temperature sensor probe is firmly fixed in its bracket and not hanging loose or touching an element.
  • Resistance check: Measure the sensor resistance at room temperature. A very low resistance (near 0 Ω) suggests a shorted sensor that will cause overheating.
  • Relay test: With power OFF, inspect the control board for a relay that may be welded closed (burn marks, melted housing). If the elements heat even when the oven is switched off at the control panel (but still powered), a stuck relay is likely.
  • Do not bypass safety: Never bypass the sensor or safety devices to keep the oven running; this is a fire hazard.

Action: Replace a faulty sensor or control board. This repair is critical for safety and may require a professional technician.

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Repair Difficulty

Professional Required 5/5

Required Part

Oven Temperature Sensor (NTC) / Main Control Board
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