Alliance error code L2
What it means
DC supply high-voltage protection (Inverter under-ceiling/cassette/ducted units).
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 Alliance codes
- E0 — Meaning depends on unit type — Inverter midwall: EEPROM error; Inverter under-ceiling/cassette/ducted: communication between indoor and outdoor units; Package unit: phase rotation / phase missing; Integrated water heater: error of sensor T5U.
- E1 — Meaning depends on unit type — Vertu fixed-speed midwall / Fixed-speed under-ceiling/cassette/ducted: EEPROM error; Atlantic midwall: outdoor tube sensor fault; Inverter midwall: indoor-outdoor communication error; Inverter under-ceiling/cassette/ducted / Pool heater / Commercial water heater: phase rotation / phase missing; Package unit: outdoor coil sensor, system A; Portable: room temperature sensor error; Water heater (retrofit): phase reversal / phase missing error; Integrated water heater: error of sensor T5L.
- E2 — Meaning depends on unit type — Vertu fixed-speed midwall / Inverter midwall / Fixed-speed under-ceiling/cassette/ducted: zero-crossing detection error; Atlantic midwall: room temperature sensor open or short circuit; Inverter under-ceiling/cassette/ducted: communication error between indoor unit and master unit; MAC cassette: room temperature sensor failure; Package unit: outdoor coil sensor, system B; Portable: evaporator temperature sensor error; Water heater (retrofit): communication error between unit and wired control, or sensor damaged; Pool heater: outdoor unit and wire controller communication error; Integrated water heater: tank and wired controller communication error; Commercial water heater: communication failure between wired remote and main unit.
- E3 — Meaning depends on unit type — Vertu fixed-speed midwall / Inverter midwall / Fixed-speed under-ceiling/cassette/ducted: indoor fan error; Atlantic midwall: indoor coil sensor open or short circuit; MAC cassette: coil temperature sensor failure; Portable: condenser temperature sensor error; Water heater (retrofit) / Pool heater: outlet water temperature sensor error; Commercial water heater: outlet water temperature sensor failure.
- E4 — Meaning depends on unit type — Inverter midwall: indoor room temperature sensor open or short circuit; Inverter under-ceiling/cassette/ducted: outdoor temperature sensor error; MAC cassette: condenser sensor failure; Water heater (retrofit): water temperature sensor failure in the water tank; Pool heater: inlet water temperature sensor error; Integrated water heater: condenser pipe temperature sensor error; Commercial water heater: water temperature sensor in the water tank failure.
- E5 — Meaning depends on unit type — Vertu fixed-speed midwall / Fixed-speed under-ceiling/cassette/ducted: room temperature sensor open or short circuit; Atlantic midwall: indoor fan fault; Inverter midwall: indoor coil sensor open or short circuit; Inverter under-ceiling/cassette/ducted: compressor discharge temperature sensor error; MAC cassette: water pump temperature sensor error; Package unit: indoor coil sensor, system A; Water heater (retrofit): condenser temperature sensor error; Pool heater: evaporator pipe temperature sensor error; Integrated water heater: outdoor ambient temperature sensor error; Commercial water heater: condenser temperature sensor failure.
- E6 — Meaning depends on unit type — Vertu fixed-speed midwall / Fixed-speed under-ceiling/cassette/ducted: indoor coil sensor open or short circuit; Atlantic midwall: EEPROM error; MAC cassette: outdoor malfunction; Package unit: indoor coil sensor, system B; Water heater (retrofit): outdoor ambient temperature sensor error; Integrated water heater: sensor Tp error; Commercial water heater: outdoor ambient temperature sensor failure.
- E7 — Meaning depends on unit type — Atlantic midwall: external feedback fault (check interconnecting wiring); MAC cassette: EEPROM malfunction; Water heater (retrofit): sensor failure at water pump outlet; Pool heater: ambient temperature sensor error; Commercial water heater: electric heating pipe temperature sensor failure.
- E8 — Meaning depends on unit type — Atlantic midwall: overheat detection / defrosting; Inverter under-ceiling/cassette/ducted: outdoor unit address error; MAC cassette: water-level alarm; Integrated water heater: electric leakage protection.
- E9 — Meaning depends on unit type — Inverter under-ceiling/cassette/ducted: power voltage error; Package unit: indoor temperature sensor error; Water heater (retrofit): T8 temperature sensor error; Pool heater: water flow switch error.