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Old 05-14-2022, 04:30 PM   #11
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Join Date: Jan 2016
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Default Re: Cyberpower CP900EPFCLCD - F03 Error

You should have a high DC voltage on C3 - 400 V 10 uF, if it is not there, then the AC voltage does not reach the diode bridge, you need to check the fuse or low-resistance resistor, or the relay between the AC 220v input and the diode bridge did not work.
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