F8
Carrier
Indoor EEPROM / PCB Memory Fault
Indoor unit shows F8 and unit may not respond to remote or may operate erratically
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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 indoor PCB firmware, Failed EEPROM, Incorrect replacement indoor PCB, Power surge damage
How to Fix / Troubleshooting
Safety: Turn OFF power at the breaker.
- Step 1 – Hard reset: Turn OFF the breaker for 10–15 minutes, then restore power and test.
- Step 2 – Check PCB history: If the indoor PCB was recently replaced, confirm it is the correct Carrier part and that any configuration (DIP switches, jumpers) matches the unit.
- Step 3 – Inspect board: Look for burnt components or swollen capacitors. Do not touch solder joints or components directly.
- Step 4 – Technician service: Persistent F8 requires indoor PCB replacement or reprogramming by a Carrier technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Indoor Main Control PCB
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