Thermador Insufficient Heating Output

Oven takes an unusually long time to preheat or never reaches the set temperature.

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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

Partially failed bake element, One leg of supply voltage missing (120V instead of 240V), Faulty temperature sensor, Weak relay contacts on EOC

How to Fix / Troubleshooting

Safety first: Turn off power before testing elements or wiring.

  • Check both elements: During preheat, both bake and broil elements may cycle. Visually confirm they glow red. A dim or non-glowing element may be failing.
  • Voltage check: Have a qualified person verify that full 240V is present at the oven terminal block. A lost leg will cause slow heating.
  • Sensor test: Test the oven temperature sensor resistance at room temperature and replace if out of spec.
  • Control relays: If elements and sensor are good, the EOC relays may not be supplying full power. Replace the EOC if necessary.
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Repair Difficulty

Hard 4/5

Required Part

Bake Heating Element
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