E9
Friedrich
EEPROM / Memory Error on Main Control Board
Unit displays E9 and may stop cooling or heating
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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 firmware, power surge damage, failed EEPROM chip, defective main PCB
How to Fix / Troubleshooting
Safety: Disconnect power before accessing the control board.
Steps to address E9:
- Power reset: Turn off the breaker or unplug the unit for at least 10 minutes to allow capacitors to discharge. Restore power and check if E9 clears.
- Check for surge damage: Inspect the control board for burn marks, cracked components, or a burnt smell. If present, the board must be replaced.
- Verify correct voltage: Ensure the supply voltage matches the unit’s rating. Chronic overvoltage or undervoltage can corrupt memory.
- Board replacement: If E9 persists after a reset and there is no wiring fault, replace the main control board with the correct Friedrich OEM part.
- Surge protection: After replacement, consider installing a surge protector to protect the new board.
Note: Firmware reprogramming is generally not field-supported on residential Friedrich units; board replacement is the standard remedy.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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