E9
Redmond
Internal Control Board Fault / EEPROM Error
E9 error on display; cooker powers on but cannot start any program.
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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 in control board, Failed EEPROM or microcontroller, Power surge damage to PCB
How to Fix / Troubleshooting
Safety first: Unplug the appliance before any disassembly.
- Power cycle: Disconnect from mains for 15–20 minutes, then reconnect and test. Sometimes transient errors clear after a full reset.
- Check for moisture: Inspect around the control panel for signs of liquid ingress. If moisture is present, dry the unit thoroughly for 24–48 hours before retesting.
- Surge protection: If the error appeared after a power outage or surge, consider using a surge protector in the future.
- Board replacement: Persistent E9 usually indicates a defective control board. Replace the main PCB with an identical Redmond spare. Transfer all connectors one by one to avoid miswiring.
Firmware reprogramming is typically not user-serviceable; contact an authorized service center.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board (PCB)
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