Carrier Furnace Error Codes
Complete list of Carrier furnace error codes with causes and how to fix them.
E1
🟡
Carrier Furnace error code E1: Indoor/outdoor unit communication error.
Technician Required
E2
🟡
Carrier Furnace error code E2: Zero-crossing signal detection failure.
Technician Required
E3
🟡
Carrier Furnace error code E3: Fan motor stall protection.
Technician Required
E4
🟡
Carrier Furnace error code E4: High discharge temperature protection.
Technician Required
E5
🟡
Carrier Furnace error code E5: Over-current/over-load protection.
Technician Required
E6
🟡
Carrier Furnace error code E6: Communication error between indoor and outdoor …
Technician Required
E7
🟢
Carrier Furnace error code E7: Mode conflict (multiple indoor units).
✓ DIY Possible
E8
🟢
Carrier Furnace error code E8: Indoor unit fan motor error.
✓ DIY Possible
F0
🟡
Carrier Furnace error code F0: IPM (Intelligent Power Module) protection.
Technician Required
F1
🔴
Carrier Furnace error code F1: High pressure protection.
Technician Required
F2
🔴
Carrier Furnace error code F2: Low pressure protection.
Technician Required
F3
🟡
Carrier Furnace error code F3: Compressor discharge temperature too high.
Technician Required
F4
🟢
Carrier Furnace error code F4: Outdoor ambient temperature sensor failure.
✓ DIY Possible
F5
🟢
Carrier Furnace error code F5: Discharge temperature sensor failure.
✓ DIY Possible
F6
🟢
Carrier Furnace error code F6: Outdoor coil temperature sensor failure.
✓ DIY Possible
F7
🟢
Carrier Furnace error code F7: Indoor coil temperature sensor failure.
✓ DIY Possible
F8
🟢
Carrier Furnace error code F8: Indoor ambient temperature sensor failure.
✓ DIY Possible
F9
🟢
Carrier Furnace error code F9: Indoor humidity sensor failure.
✓ DIY Possible
H3
🟡
Carrier Furnace error code H3: Compressor overload.
Technician Required
H4
🟡
Carrier Furnace error code H4: Indoor/outdoor communication failure.
Technician Required
H5
🟡
Carrier Furnace error code H5: IPM module protection.
Technician Required
H6
🟢
Carrier Furnace error code H6: Indoor fan motor feedback error.
✓ DIY Possible
H7
🟢
Carrier Furnace error code H7: Outdoor synchronization failure.
✓ DIY Possible
P0
🟡
Carrier Furnace error code P0: IPM protection.
Technician Required
P1
🔴
Carrier Furnace error code P1: High voltage protection.
Technician Required
P2
🔴
Carrier Furnace error code P2: Low voltage protection.
Technician Required
P3
🟡
Carrier Furnace error code P3: Compressor phase loss protection.
Technician Required
P4
🟡
Carrier Furnace error code P4: Compressor overheating protection.
Technician Required
P5
🟡
Carrier Furnace error code P5: Compressor overcurrent protection.
Technician Required
P6
🟢
Carrier Furnace error code P6: Drive module overheating.
Technician Required
P7
🟡
Carrier Furnace error code P7: PFC protection.
Technician Required
P8
🟢
Carrier Furnace error code P8: Outdoor temperature too high.
✓ DIY Possible
P9
🟡
Carrier Furnace error code P9: Compressor overload.
Technician Required