Troubleshooting（2）— Failure Modes For Refrigerators: F1 F2 F3
In the last issue I introduced you to the 6 main failure modes of refrigerators at present, so this issue I will explain to you in detail the reasons for the F1 F2 F3 failure of refrigerators.
1. NTC thermistor failure(F1)
a、The NTC fault is displayed on the LCD screen. When the detected NTC temperature is lower than -30°C or the circuit is broken, the display screen displays F1;
When the detected NTC temperature is greater than 50℃ or short circuit, the display shows F1.
b、When the F1 fault is reported, the compressor stops working.
Cause of failure:
1. The NTC connector is loose and falls off.
2.The NTC line is short-circuited or broken and open-circuited.
3. The ambient temperature is higher than 50℃ or lower than -30℃.
2.Compressor-battery voltage protection fault causes(F2)
1. When the compressor starts, the battery input voltage is lower than the startup voltage of the H/M/L gear.
2. When the compressor is running, the battery input voltage is lower than the shutdown voltage of the H/M/L gear.
3. The input voltage is between DC17~22V.
4. The input voltage is higher than DC31.5V.
3.Reasons for fan overcurrent fault(F3)
1. The condensing fan circuit is short-circuited;
2. The working current of the condensing fan is overloaded;
3. The compressor start-up pressure is too large, resulting in too large voltage drop, resulting in overcurrent of the condensing fan.