E19
Thermador
High Voltage Relay / Power Control Error
Microwave shows 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 control board,Loose wiring to 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 HV section.
- Step 1 – Power reset: Disconnect power for 10 minutes, then restore and test.
- Step 2 – Listen for 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): Remove the cover and inspect the control board for burned relay contacts or damaged traces.
- Step 4 – Check HV wiring: Verify that wires to the transformer or inverter are secure and not burned.
- Step 5 – Replace 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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