E09
Sub-Zero
Auxiliary Relay / Output Fault
Oven display shows E09 and interior lights or auxiliary functions may not work correctly.
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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 relay on main control board, Shorted accessory circuit (lights, door lock motor, or cooling fan), Damaged wiring harness to accessory, Internal control board failure
How to Fix / Troubleshooting
Safety: Turn off power at the breaker before accessing the control area.
- Identify affected function: Note which function fails when E09 appears (lights, lock, fan). This helps narrow the faulty circuit.
- Inspect wiring: Remove the control panel or rear cover to access the main control board. Trace the wiring from the affected accessory (e.g., light socket, lock motor) to the board. Look for burned connectors, melted insulation, or pinched wires.
- Test accessory: If accessible, test the accessory component (e.g., light socket, lock motor) for continuity. Replace if open or shorted.
- Check for shorts: Ensure no wires are touching the oven chassis or sharp edges. Repair or replace damaged sections.
- Control board replacement: If the accessory and wiring are good, the relay or driver on the main control board is likely defective. Replace the control board with the correct OEM part.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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