Midea air-conditioning maintenance, change it

Today to talk to a user to fix 32 midea air-conditioning, this problem to master is simpler, boot the machine does not turn, inside the machine is normal, but the machine work for a while display E4, check the E4 is temperature fuse protection, boot repair machine outside the compressor fan without electricity, then open the machine to check within 12 v normal, 7805 is also normal, with pens and sub relay fan also normal operation of the compressor didn't dare to pick up, the last sub take pens and burn out, ha ha.

because there is no voltage output thought there must be something problem, on the ( Delayed) Ha ha. Put the machine in doubt check up all, the inner temperature is changed, the compressor and the fan is not turn, often met outside the machine start compressor capacitance is broken, but the fan should be normal operation, so there is no doubt is a problem of compressor startup capacitor. Thought then look at outside the machine, because the user's air conditioning is on the second floor with a roof, go upstairs and open the outer casing a heat, thought the machine compressor not turn which come of the heat, touch compressor is very hot, so let users in the open air conditioning compressor from grunts found outside the machine, was over in a few seconds, it knows.

no wonder I wait until after the boot on the upstairs with pens and supply voltage would have no electricity. This just understand why just outside the reason of the fan does not turn, turned out to be just boot to the compressor power supply first, then to the fan power supply, due to the compressor capacitance bad, haven't caused to the machine within the fan power supply protection. Change of capacitance, qian hong green two ( Not the color wheel) , call it a day leave.

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