E20
Amfa4000
Internal Communication Bus Fault
E20 displayed and the Amfa4000 reports an internal communication error between display and main board
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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 display-to-main-board ribbon cable, Oxidized connector pins, Faulty display module, Faulty main control PCB
How to Fix / Troubleshooting
Safety first: Disconnect mains power before opening the control housing.
- 1. Reseat ribbon cable: Open the control cover and locate the flat ribbon cable between the display/keypad and the main PCB. Gently unplug and reinsert it, ensuring it is fully seated and straight.
- 2. Inspect connectors: Look for bent pins, corrosion, or contamination on the connectors. Clean lightly with contact cleaner if necessary.
- 3. Power cycle: Reassemble, restore power, and check if E20 clears.
If E20 remains, either the display module or the main control board is defective. Replace the suspect module with a compatible Amfa4000 part.
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Repair Difficulty
Medium
3/5
Required Part
Amfa4000 Display Module
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