E9
Keeprite
EEPROM / Control Memory Error
Keeprite control shows E9; unit may not start or may shut down quickly.
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
Corrupted firmware on indoor control board, Power surge or lightning damage, Defective control board memory chip
How to Fix / Troubleshooting
Safety first: Turn off power to the indoor unit before touching the control board.
- Step 1 – Power cycle: Turn off the indoor unit breaker for 10 minutes to fully discharge the board, then restore power and check if E9 clears.
- Step 2 – Check for surge damage: Inspect the control board for burn marks, melted traces, or a burnt smell. If present, the board must be replaced.
- Step 3 – Verify proper grounding: Ensure the indoor unit chassis is grounded and that neutral and ground connections are tight at the electrical panel.
- Step 4 – Board replacement: If E9 persists with no visible damage, the EEPROM is likely corrupted. Replace the indoor control board with the correct Keeprite part number. Transfer any configuration jumpers or dip switch settings from the old board.
- Step 5 – Surge protection: Consider installing a whole-house or dedicated HVAC surge protector to prevent future control board failures.
Advertisements
Repair Difficulty
Hard
4/5
Required Part
Indoor Control Board
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements