E9
Tristar
Control Panel / Keypad Communication Error
E9 appears on the display and the unit will not respond to temperature or time settings.
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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
Loose ribbon cable between touch panel and main PCB, Damaged touch control panel, Failed microcontroller on main control PCB
How to Fix / Troubleshooting
Safety: Unplug the air fryer before opening the control panel area.
- Power cycle: Unplug for 10 minutes, then reconnect. If E9 returns immediately, proceed to inspection.
- Inspect control connections:
- Remove screws securing the top/control panel housing.
- Locate the flat ribbon cable or wiring harness between the touch panel and main PCB.
- Disconnect and reconnect the cable to clean contacts and ensure a firm fit.
- Check for moisture or grease:
- Look for signs of liquid ingress behind the control panel.
- Gently clean with isopropyl alcohol and a lint-free cloth if contamination is present.
- Test operation: Reassemble and power on. If E9 persists, either the touch panel or main PCB is defective.
- Replace parts: Replace the touch control panel assembly first (most common). If that does not resolve the issue, replace the main control PCB.
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Repair Difficulty
Medium
3/5
Required Part
Touch Control Panel Assembly
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