Haier · Air Conditioning
This error indicates a problem with communication between the indoor and outdoor units. It might mean the signal is being blocked or lost.
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Check all wiring connections between the indoor and outdoor units.
Ensure there are no sources of strong electromagnetic interference near the unit.
Try resetting the air conditioner by turning off the power at the breaker for 5 minutes, then turning it back on.
If the error persists, contact a qualified service technician.