F7
Carrier
Outdoor EEPROM / PCB Memory Fault
Indoor unit displays F7 and system may not start or may shut down unexpectedly
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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 outdoor PCB firmware, Failed EEPROM chip, Incorrect replacement PCB not matched to indoor unit, Voltage spikes damaging memory
How to Fix / Troubleshooting
Safety: Turn OFF power at the disconnect and breaker.
- Step 1 – Power cycle: Leave power OFF for at least 10 minutes to fully discharge the board, then restore power and test.
- Step 2 – Check model compatibility: If the outdoor PCB was recently replaced, verify that the board part number matches the Carrier model and that any required DIP switch or jumper settings are correct.
- Step 3 – Surge protection: Inspect for signs of surge damage (burn marks). Consider installing a surge protector on the system.
- Step 4 – Technician replacement: If F7 persists, the outdoor PCB must be replaced or reprogrammed by a Carrier technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Outdoor Main Control PCB
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