Carrier error code F0
What it means
Low refrigerant protection.
Possible causes
System undercharged after installation Slow leak in piping or coils Expansion valve malfunction creating low evaporator pressure
Suggested fix
Compare suction pressure and superheat to expected values and inspect for leaks; rectify leaks and charge the system correctly following Carrier guidelines and legal requirements.
Safety first. Isolate the power supply before inspecting any unit. Refrigerant-circuit
and electrical repairs must be carried out by a qualified, registered technician.
Other Carrier codes
- E0 — Indoor unit EEPROM parameter error (QHC inverter hi-wall series).
- E1 — Meaning depends on series — QHC inverter hi-wall: indoor / outdoor units communication error; QED fixed-speed: EEPROM error.
- E2 — Zero-crossing signal detection error (QED fixed-speed series).
- E3 — Indoor fan speed out of control (QHC inverter hi-wall, QED fixed-speed series).
- E4 — Meaning depends on series — QHC inverter hi-wall: indoor room temperature sensor T1 open or short circuit; QED fixed-speed: compressor over-current (4 successive events).
- E5 — Meaning depends on series — QHC inverter hi-wall: evaporator coil temperature sensor T2 open or short circuit; QED fixed-speed: indoor room temperature sensor T1 open or short circuit.
- E6 — Evaporator coil temperature sensor T2 open or short circuit (QED fixed-speed series).
- E9 — Indoor and outdoor unit communication error (QED fixed-speed series).
- EC — Meaning depends on series — QHC inverter hi-wall: refrigerant leakage detection; QED fixed-speed: refrigerant leak detection.
- F1 — Outdoor ambient temperature sensor T4 open or short circuit (QHC inverter hi-wall series).