Continuous Beep and Red Light on Startup - APC BX600C-IN

[Prasenjitpaul234]

I am writing to seek technical assistance for my APC Back-UPS, which I have been using in India for the past 3 years.

Device Details :

• Model Number: BX600C-IN (600VA / 360W)

• Age of Device : Approx. 3 years

• Usage Context : The area experiences very occasional power cuts, and the battery backup has otherwise been performing well for my setup.

The Problem:  Over the past two days, I have encountered a specific issue during the initial startup :

1. I plug the UPS into the main wall socket and turn on the wall switch.

2. When I press the main power button on the UPS, the indicator light turns solid red and the unit emits a continuous beep / constant tone.

Temporary Workaround : To bypass this, I have to turn off the UPS power button, switch off the main wall socket, unplug the unit completely, and plug it back in. When I repeat the startup process a second time, the UPS boots up normally with a green light, no sound, and works perfectly.

Because this is now happening consistently on the first startup attempt, it seems like an internal self-test or error state.

I look forward to hearing from you soon with the next steps.

[Teken]

If the status LED and tone are correct it indicates an internal hardware error / fault as outlined in the user manual page 9:

https://download.schneider-electric.com/files?p_enDocType=User+guide&p_File_Name=BU+UM+990-9656F+MN0...

You may perform a brain dead reset of the unit as outlined in this APC Resource Link and report the outcome:

https://www.se.com/us/en/faqs/FA158947/

NOTE: If there is any doubt as to the current health of the battery (RBC). Then, it should be tested for internal resistance, voltage, and load.

The average service life of the RBC is 2-5 years depending upon usage, temperature, and environmental conditions.

The raw cell is designed to sustain 260 full cycles subject to the same caveats.

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