**Midea KFR-23GW1UXY-Q3 Tianzuanxing Air Conditioner: Not Cooling**
**Analysis and Inspection:** After inspection, it was found that the technical parameters of resistor R32 on the circuit board had changed.
**Repair Method:** Replace resistor R32 to eliminate the fault.
**Warm Reminder:** Midea KFR-23GW/UXY-Q3 Tianzuanxing air conditioner temperature detection and control circuit.
1. **Circuit Analysis:** In the circuit diagram, T1 is the room temperature sensor, and T2 is the evaporator tube temperature sensor. When the resistance values of T1 and T2 change, the voltage input to pin 24 and pin 25 of the main CPU chip changes after being divided by R32 and R27. This completes the process of converting temperature signals into voltage signals, achieving temperature detection.
2. **Main Components Function:** If T1 or T2 opens or shorts, it will cause abnormal voltage input to pins 24 and 25 of the CPU. Additionally, if R32 or R27 opens, the voltage at pins 24 and 25 will become high level. If R11 or R12 opens, or G15 and C16 short, the potential at pins 24 and 25 will become 0V, causing the entire unit to shut down protectively. When the resistance parameters of T1 and T2 change, it leads to abnormal input voltage to the main CPU, causing faults such as uncontrollable fan speed and inability to stop the machine.
3. **Temperature Sensor Testing Method:** Since the resistance characteristics of the room temperature sensor and the pipe temperature sensor are exactly the same, the simplest way to determine whether T1 and T2 are good is the comparison method. That is, remove T1 and T2 from the main control board, wait for 15 seconds, and then measure their resistance values respectively. The difference should not exceed ±8%; otherwise, the sensor should be replaced.
**Source of Article:** http://blog.sina.com.cn/meidikongtiao