When the indoor unit displays an P4 error on temperature indicator, it means there is an inverter compressor drive error.Click to see full answer. Likewise, what does p1 mean on air conditioner?Common portable air conditioner error codes can be found below: P1 or H8 – Water reservoir is full.Secondly, what does p5 mean in AC? Here is some troubleshooting information to solve the issue. If your air handler is displaying P5 error code which are specially for multi-zone, this initiates a conflict mode meaning that one of your indoor units is calling for cooling and the other one is calling for heating mode. People also ask, what is the meaning of p3 in AC? If your system is displaying a P3 error code. This simply indicates you that the outdoor ambient temperature is too low for your compressor to operate. All of our Aura series, are able to heat up to -30 Degree Celsius or -22 Degree Fahrenheit.What is the meaning of EC in air conditioners?EC VS AC. For those who are still unsure, EC stands for electronically commutated and combines voltages of both AC and DC bringing the best of both technologies together to form EC. This means that the motor runs on DC voltage but with an AC power supply.