1 Introduction
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Based on the experience of the brains, the experience of rote memorization, although it can quickly solve some kind of failure, but knows it but does not know why. Of course, this will not be bypassed. As a result, the idea is narrow. When the fault phenomenon or the fault location is slightly different, it will be helpless. When encountering a completely different new model, it is impossible to detect... After the necessary conditions for personnel, it is necessary to master the correct detection method: a good method can do more with less, and easily and effectively determine the fault location; the bad method brings time waste, component waste and user objection, but also It is possible to expand the fault and even cause losses to the user.
2 circuit analysis
Gree KFR-50L/H610 inverter air cabinet type air conditioner outdoor unit MCU control circuit shown in Figure 1.
3 Repair note
Fault 1: After 5 hours of power on, the display shows fault code E1
Analysis and overhaul: On-site inspection found that the resistance parameter of the PTC thermistor changed. Troubleshoot after replacing the PTC thermistor.
Experience and experience: In the inverter air conditioner, the PTC thermistor limits and protects the power supply voltage and working current of the air conditioner. When there is lightning or some reason causes the voltage to rise, the PTC thermistor It can suppress the surge and protect the air conditioner from damage.
When the ambient temperature is 25 °C, measure the resistance of the PTC thermistor with a multimeter, which is about 30 to 50 Ω.
Fault 2: After moving the machine, the outdoor fan does not work
Analysis and overhaul: According to the user's report, after the unit was moved, the air conditioner was not cooled. The maintenance workers who had not received formal training had replaced the starting capacitor, but the fault remained unresolved. On-site inspection found that the outdoor fan motor winding was broken. After replacing the fan motor, troubleshoot. The replacement method is shown in Figure 2.
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