Gree KFR-50L / H610 variable frequency cabinet outdoor air conditioner outdoor machine repair

1 circuit analysis Gree KFR-50L / H610 Variable Frequency Cabin Air conditioner Out Outer Machine MCU Control Circuit is shown in Figure 1. 2 repair notes Fault 1: After powering 5 h, the display shows the fault code E1 Analysis and Overhaul: Field Testing found the resistance parameters of PTC thermistors. After replacing the PTC thermistor, troubleshooting. Experience and experience: PTC thermistor is limited and protected by the power supply voltage and operating current of the air conditioner machine, and the PTC thermistor is increased when the voltage is increased in the event of lightning or some reason. It is possible to suppress the role of surges, so that the air conditioner is not damaged. When the ambient temperature is 25 ° C, the resistance of the PTC thermistor is measured with a multimeter, which is about 30 to 50 Ω. Fault 2: After transferring, outdoor fan does not work Analysis and maintenance: According to the user, the air conditioner has no cooling phenomenon after the transfer machine, and the start-up capacitor has been replaced without formal training, but the failure is still not resolved. On-site detection, found outdoor fan motor winding circuit. After replacing the fan motor, troubleshooting. The replacement method is shown in Figure 2. 3 experience and experience Rich practical experience is very important for repair. This not only quickly eliminates a lot of faults, but also to summarize the problem, understand the fault, understand the circuit, and improve the ability to solve problems from a deeper level. With experience, the practice of the brain, with the experience of death hard, although some kind of fault can be solved soon, it is known that it doesn't know. This will certainly do not touch bypass, the result is the narrow thinking, when the fault phenomenon or the faulty part is slightly unpleassed, it is not a completely different new model, and it is even more inspection ... After the conditions necessary, you must master the correct detection method: good way to do half-mexion, simply and effectively determine the faulty part; the bad approach brings time waste, the waste of the components and the user objection, but also extreme It is possible to expand the fault and even cause loss to the user. Read more

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