E9
GoWISE USA Internal EEPROM or firmware error

Display shows E9 and the unit may shut off unexpectedly or not start; sometimes occurs after a power surge.

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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

Corrupted firmware on main control board,Power surge or static discharge damage,Failed memory IC on control board,Loose control board connectors

How to Fix / Troubleshooting

Safety first: Unplug the air fryer before opening the housing. Do not attempt to reprogram firmware without official support.

Step-by-step checks:

  • Extended power reset: Unplug the unit for at least 30 minutes to allow internal capacitors to discharge. Plug back in and test.
  • Surge protection: If the error occurred after a storm or outage, move the unit to a surge-protected outlet for future use.
  • Inspect board connections: Remove the cover to access the main control board. Reseat all multi-pin connectors and ribbon cables to ensure solid contact.
  • Look for board damage: Check for burnt components, cracked solder joints, or discoloration around the microcontroller and memory ICs.
  • Test operation: Reassemble and test multiple functions (temperature up/down, timer, presets). If E9 reappears, the board is likely irreparably corrupted.

When to stop: EEPROM or firmware faults generally require replacement of the main control board. Contact GoWISE USA or a professional technician for the correct replacement part.

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Repair Difficulty

Professional Required 5/5

Required Part

Main Control Board
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