F4
Ebac
Keypad / User Interface Fault
F4 code, unit does not respond to keypad presses
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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
Damaged membrane keypad, Loose keypad ribbon cable, Failed display/control PCB, Liquid ingress into control panel
How to Fix / Troubleshooting
Safety: Unplug the unit before opening the control panel.
Steps:
- 1. Inspect panel: Check the front control panel for cracks or signs of water ingress. If the panel has been exposed to condensation or spills, it may have shorted.
- 2. Reseat ribbon cable: Remove the control panel cover and locate the ribbon cable from the keypad to the display or main PCB. Reseat both ends and ensure the locking tabs are engaged.
- 3. Test keypad: With the panel open and power restored (use caution), press each button and observe if any response occurs. If none respond, the keypad membrane is likely faulty.
- 4. Replace keypad or UI board: Depending on model, replace the membrane keypad overlay or the entire user interface PCB with the correct Ebac part.
- 5. Check main PCB: If a new keypad does not restore operation, the main control PCB may not be processing inputs and will need replacement.
Warning: Avoid operating the unit with the control panel open; live parts may be exposed.
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Repair Difficulty
Medium
3/5
Required Part
Keypad / User Interface PCB
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