3U
GE Profile UltraFast
Internal Communication / Control Board Error
Display shows 3U and the unit may randomly pause or reset during operation.
Advertisements
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.
Advertisements
Possible Causes
Loose harness between main control and sub-boards, Failing main control board, Electrical noise or interference on communication lines
How to Fix / Troubleshooting
Safety first: Unplug the appliance before accessing any control boards.
Steps to check:
- Power reset: Disconnect power for 10 minutes to fully discharge the control system. Restore power and test.
- Inspect harnesses: Remove the top panel and inspect all harness connections to the main control board, motor, UI, and sensors. Reseat each connector one at a time.
- Look for damage: Examine the main board for burnt components, corrosion, or insect damage. Replace the board if any are found.
- Environmental check: Ensure the unit is not installed in an area with excessive moisture or heat that could affect electronics.
Persistent 3U errors typically require replacement of the main control board by a qualified technician.
Advertisements
Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements