I apologize if this is the wrong space to post this upfront. I have an AP7930 i bought used and it has worked great for the past few months. I noticed last night the LCD displays ER so i connected via serial cable and it shows everything is unknown and it will not boot up. I've tried to set the IP and names over again and after i logout it says i'm in passthru mode and resets again.
I never had to troubleshoot these pdus before so i don't even know where to start. What can i do aside from unplugging the unit, power cannot be lost.
"Er" on the front display means one of the internal PDU power supplies has failed - with the symptoms you're describing I would assume the PS that powers the network card. The only real wait to troubleshoot this is to power cycle the PDU for ~10 seconds and see if it boots up again. Unfortunately if that doesn't clear it then the PDU would need to be replaced.
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