On a customer site today and we are setting up two new HP R5500 Rack Mount UPS for the client. The tech has installed them and we powered them up… but we have two lots of flashing LEDS on the front panel. I downloaded the manual from the HP website here. Ok – so a quick check of the manual shows that the two LEDs are the Utility LED which is flashing green and the Battery Fault LED which is flashing red. The LED fault table shows each of these faults individually but not together. So I started at the beginning again and found that the clients IT tech had not turned on the battery circuit breaker switch below. 
He didn’t do this as it had a nice tidy cable tie around it and he thought he didn’t need to do it. I cut the cable tie and flicked the switch. That fixed the flashing red LED for us. The flashing green LED was there because the UPS was in standby mode. Once I powered the UPS up and it’s all good to go.
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