E20
EcoSmart
EEPROM / Configuration Memory Fault
Unit shows E20; may be associated with internal memory or configuration issues.
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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 configuration data, Failed EEPROM chip on control board, Power interruption during configuration write, Incompatible replacement control board
How to Fix / Troubleshooting
Safety: Turn OFF power before opening the unit.
- Power cycle: Turn the breaker OFF for 5–10 minutes, then back ON to see if the error clears.
- Factory reset (if supported): Use the EcoSmart control panel procedure to restore factory settings (refer to the model-specific manual). Re-enter desired temperature settings afterward.
- Check board part number: If the control board was recently replaced, verify that the part number matches your exact EcoSmart model.
- Service: If E20 persists after reset and verification, the control board’s memory device is likely defective and the board should be replaced.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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