E7
Honeywell
EEPROM / Memory Error
Dehumidifier displays E7 and will not operate; sometimes appears after a power outage.
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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 control board memory, Power surge or brownout event, Defective main PCB, Loose display/control connector
How to Fix / Troubleshooting
Safety: Disconnect power before servicing.
Steps:
- Extended reset: Unplug the unit for 30 minutes. During this time, press and hold any front panel button for 10 seconds to help discharge internal circuits. Plug back in and check if E7 clears.
- Surge protection: If E7 occurred after a storm or outage, move the unit to a known good outlet and consider using a surge protector once repaired.
- Inspect control connections: Remove the control panel and verify all connectors between the display board and main PCB are secure.
- Board replacement: If E7 persists, the EEPROM or microcontroller on the main PCB is likely corrupted. Replace the main control board.
Note: There is no field reprogramming procedure for most Honeywell consumer dehumidifier boards; replacement is the standard remedy.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board (PCB)
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