The mains power we use is alternating current. The air conditioner's incoming wires should normally consist of two wires, one for fire and one for zero. Only direct current is called positive and negative.
The situation you mentioned should be that the neutral wire of the incoming line is disconnected and key inspections need to be carried out; When measuring the neutral wire, it looks like a live wire, which means the live wire passes through the circuit breaker → live wire → electrical switch → electrical appliance → neutral wire When it reaches the neutral end of the breaker, use a test pen to measure the neutral end of the breaker and it will glow like a live wire.