E19
Thermador High Voltage Relay / Power Control Error

Microwave displays E19, and the interior light and fan may run, but heating does not start.

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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

Failed high-voltage relay on the control board, Loose wiring to the transformer or inverter, Shorted high-voltage component causing relay protection, Control board logic fault

How to Fix / Troubleshooting

Safety warning: High-voltage components are dangerous. Only qualified persons should access the high-voltage (HV) section.

  • Step 1 – Power reset: Disconnect the power for 10 minutes, then restore and test.
  • Step 2 – Listen for a relay click: When starting a cook cycle, you should hear a distinct click from the control board. If absent, the relay may not be energizing.
  • Step 3 – Internal inspection (qualified persons only): Remove the cover and inspect the control board for burned relay contacts or damaged traces.
  • Step 4 – Check HV wiring: Verify that the wires to the transformer or inverter are secure and not burned.
  • Step 5 – Replace the control board: If the relay is defective or the board is damaged, replace the main control board with a Thermador OEM part.

Recommendation: If a shorted HV component caused the failure, the technician should test and replace those parts as well.

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Repair Difficulty

Professional Required 5/5

Required Part

Main Control Board
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