Carrier error code E1
What it means
Meaning depends on series — QHC inverter hi-wall: indoor / outdoor units communication error; QED fixed-speed: EEPROM error.
Possible causes
Wiring mistake between indoor and outdoor units Indoor or outdoor main PCB faulty Faulty reactor
Suggested fix
Check interconnecting wiring; if correct, test the reactor (should read ~0 ohm) and replace if open, then substitute the indoor and finally outdoor main PCB.
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).
- 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.
- F0 — Low refrigerant protection.
- F1 — Outdoor ambient temperature sensor T4 open or short circuit (QHC inverter hi-wall series).