Carrier mini split error codes

Carrier mini split error codes. A variety of error codes exist in carrier mini split air conditioners. They inform us about problems present in each component. After knowing these ciphers, we can remove the errors.

I was going to have a pleasant trip with my friends when suddenly my carrier mini stopped working. I wanted to fix it because I didn’t want to have this problem on my return home.

I didn’t know about the error codes. Fortunately, a friend I was traveling with knew. So he helped me before we left. At that time, I thought I should learn them too. I did later. The next time when a problem appeared, I solved it easily.

I learned them, and now I’m going to explain them a bit, too, as they aren’t explained in the guide.

Carrier mini split error codes

carrier mini split error codes

Ciphers exist for our easy understanding. All mean different. There can be a communication error. This happens between indoor and outdoor units.

The condenser coil may have a short circuit. Overflow or lack of voltage will have its own cipher.

There may be leakage, and it was detected. High-pressure protection is needed is because of the strength. We may need to enable current protection for the compressor.

The outdoor fan may malfunction, and the speed may be disturbed. There may be a mode of conflict. The errors are divided into the outdoor and indoor categories.

Outdoor ciphers

Outdoor ones are more common, so let’s see them first.

E0 code

E0 means the EEPROM of the outdoor unit has malfunctioned. It happens when there is a communication problem between the indoor and the outdoor appliance unit.

It occurs when there is a malfunction in communication between the main board of the outdoor unit and the IPM board.

It is a short circuit outdoor unit temperature sensor, or it is open. This is the one for voltage protection. The malfunctioning of the speed of the outdoor fan is shown by this.

F1 code

carrier mini split error codes 2022

F1 is there as a defect between the connector of the sensor and No A indoor outlet temperature sensor coil. In it, the No B outlet temperature sensor coil of the indoor and the connector sensor may have some defects.

In it, the No C coil temperature sensor or the connector connecting the sensor has some defect in the outlet unit.

This error is the same as above, but instead of No C coil, No D coil, or connecting sensor is damaged. This error also familiarises with the above problem but with defects in Coil No E instead of No D.

 P3 error

P3 issue relates to the current protection of the compressor. This issue is related to high-pressure protection. This issue is related to low-pressure protection.

The issue is the temperature protection of the compressor. The P3 issue is related to the extreme temperature protection of the condenser. It is for IPM module protection.

Indoor ciphers

indoor ciphers

Indoor codes have different meanings than outdoors. Some may be similar.


EC is leakage of refrigerant in AC. It causes the temperature to be disturbed. It is a parameter error of the EEPROM of the indoor unit. This communication error occurs between indoor and outdoor units.

It is the speed error of the indoor fan that makes it out of control. This is caused by a short circuit in room temperature sensor T1. It is a Short circuit in T2, the evaporator coil temperature sensor.

F1 error

F1 is a Short circuit in T4, the ambient temperature sensor(outdoor). Its short circuit in T3 is the condenser coil temperature sensor.

This is a short circuit in T5, the compressor discharge temperature. There is an EEPROM parameter error in the outdoor unit. The uncontrollable speed of the outdoor fan is caused by this error.

P0 error

P0 is a malfunction in IPM or overstrong protection of IGBT. It is both low and overvoltage protection. It is the protection of the compressor against high temperatures.

It is a driver error regarding the compressor inverter. There is a mode conflict. This is for the voltage protection of the compressor.


If any of these errors are displayed, think of a solution according to the code. You don’t have to memorize all the codes. Remember the basics. If you cannot understand the meaning, call a professional.

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