Thermador No Heat / Control Inhibit

Oven light and display work, but oven will not start any cooking cycle (no heat, no relay click).

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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

Child lock or Sabbath mode enabled, Faulty door switch, Failed relay on control board, Open thermal fuse or high-limit thermostat

How to Fix / Troubleshooting

Safety first: Disconnect power before accessing internal components like fuses or thermostats.

  • Check lock modes: Verify that child lock or Sabbath mode is not active. Refer to the user manual to disable these features.
  • Door switch test: Open and close the door; the oven light should respond. If not, the door switch may be faulty.
  • Listen for relays: Start a bake cycle and listen for a click from the control board. No click may indicate a failed relay or open safety device.
  • Inspect thermal fuse (advanced): Access the rear or top of the oven to locate any thermal fuse or high-limit thermostat. Test for continuity; replace if open.

If safety devices and door switch are good, the main control board may not be sending power to the heating circuits and may require replacement.

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Repair Difficulty

Hard 4/5

Required Part

Thermal Fuse / High-Limit Thermostat
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