UPS indicating overload when all loads are disconnected Even after removing the batteries Alarm ringing throughout

Is red light on for overload or for battery?
If on overload, try reducing the load on the UPS. If red light on overload persists buy a new UPS (overload fault hard to repair).

Red light on battery - replace the batteries.

Red light on boost or buck, may mean that the nominal voltage of ups and the limits need to be changed/corrected.

trafo on bord, or relay

1. Four beeps every 30seconds (On Battery LED will be illuminated)
This alarm indicates that the Battery PowerSupplied outlets are now supplying battery power as opposed to power from theutility. If the UPS determines that the input utility power is unsafe for yourcomputer equipment, the UPS will switch to battery power.
Note: Ifthe power disturbance is brief, you may only hear one or two beeps.

2. Continuous Beeping (On Battery LED will beilluminated)
This alarm indicates that a Low Batterycondition has been reached and that the UPS will soon shutdown. Once the UPStransfers to On Battery operation, it can only stay on battery for a limitedamount of time. The UPS will sound this alarm about two minutes before thebatteries are totally exhausted. Once exhausted, the UPS will shutdown and turnoff its output power to your equipment. If you hear this tone you shouldimmediately shutdown your computer to prevent data loss or corruption.

3. Continuous Beeps for 30 seconds (BackUPS OFFICE 250 and 280 ONLY)
This alarm indicates the unit has detected anOverload condition after it has performed a self-test during start-up.

4. Continuous Two-Tone Beep
This alarm indicates a severe Overload wasdetected while the unit was on-battery operation. This tone will continue tosound until the unit shuts down.

5. Continuous Tone (On Battery LED will beflashing)
This alarm indicates that the battery-poweredoutlets are overloaded.

6. Continuous Tone (On Line and On BatteryLEDs flashing) Back UPS OFFICE 350,400, and 500 ONLY
This alarm indicates that an internal UPS faulthas occurred.

Continuous Beeping (theamber On Battery LED will be illuminated)
This alarm indicates that the UPS has reached aLow Battery condition and will soon shutdown. The UPS can only operate onbattery for a limited amount of time. In order to protect the unit's batteriesfrom discharging too much, the UPS will shutdown and turn off its output. Towarn you that the unit will soon shutdown, the UPS will sound this alarm 2minutes before actual shutdown. With optional Powerchute Plus software, 2minutes can be changed to 5, 7, or 10 minutes to give you more of a warning ofimpending shutdown. If you hear this tone, you should immediately gracefullyshutdown your operating system to prevent data loss or corruption.
Note:This graceful shutdown will occur automatically if Powerchute PLUS software isbeing used.

Constant, Solid Tone (the red Overload LEDwill be illuminated)
This alarm indicates that the UPS has detectedan Overload condition. If this alarm is sounded, try removing non-essentialequipment. The alarm will remain until the load is reduced. To determine ifyour UPS is capable of handling the equipment you want to protect, visit APC'sSizing Guide at www.apcc.com/sizing.

Continuous Beeps for One Minute; RepeatedEvery 5 Hours (Replace Battery LED will be illuminated)
This alarm indicates that the UPS has failed itsSelf-Test of the battery. The unit will continue to sound this alarm until theunit passes the test. Try to let the unit charge for a few hours and thenperform another Self-Test (Press and hold the on/off button until the second'chirp', then release). If it fails and the unit is still in-warranty (twoyears from date of purchase), then contact APC. If the unit fails and its outof warranty, then order a replacement battey cartridge through your reseller,distributor, or from APC's web site.

problem is in the inverter

These beep error codes may help you.
1. Four beeps every 30 seconds (On Battery LEDwill be illuminated)
This alarm indicates that the Battery Power Suppliedoutlets are now supplying battery power as opposed to power from the utility.If the UPS determines that the input utility power is unsafe for your computerequipment, the UPS will switch to battery power.
Note: Ifthe power disturbance is brief, you may only hear one or two beeps.

2. Continuous Beeping (On Battery LED will beilluminated)
This alarm indicates that a Low Battery condition hasbeen reached and that the UPS will soon shutdown. Once the UPS transfers to OnBattery operation, it can only stay on battery for a limited amount of time.The UPS will sound this alarm about two minutes before the batteries aretotally exhausted. Once exhausted, the UPS will shutdown and turn off itsoutput power to your equipment. If you hear this tone you should immediatelyshutdown your computer to prevent data loss or corruption.

3. Continuous Beeps for 30 seconds (Back UPSOFFICE 250 and 280 ONLY)
This alarm indicates the unit has detected an Overloadcondition after it has performed a self-test during start-up.

4. Continuous Two-Tone Beep
This alarm indicates a severe Overload was detectedwhile the unit was on-battery operation. This tone will continue to sound untilthe unit shuts down.

5. Continuous Tone (On Battery LED will beflashing)
This alarm indicates that the battery-powered outletsare overloaded.

6. Continuous Tone (On Line and On Battery LEDsflashing) Back UPS OFFICE 350, 400, and 500 ONLY
This alarm indicates that an internal UPS fault hasoccurred.

The "Overload" light and alarm is to tell you that the devices connected to the UPS are drawing more current than the UPS can safely provide with battery backup. You should disconnect a few items, and the alarm and overload light will turn off. The "Building wiring fault" light on the back is to tell you that there's no proper ground wire inside the wall outlet that you're using. These two problems are not related to each other.

The Back-UPS Office unit has five different tones or alarms:

1. Four beeps every 30 seconds (On Battery LED will be illuminated)
This alarm indicates that the Battery Power Supplied outlets are now supplying battery power as opposed to power from the utility. If the UPS determines that the input utility power is unsafe for your computer equipment, the UPS will switch to battery power.
Note: If the power disturbance is brief, you may only hear one or two beeps.

2. Continuous Beeping (On Battery LED will be illuminated)
This alarm indicates that a Low Battery condition has been reached and that the UPS will soon shutdown. Once the UPS transfers to On Battery operation, it can only stay on battery for a limited amount of time. The UPS will sound this alarm about two minutes before the batteries are totally exhausted. Once exhausted, the UPS will shutdown and turn off its output power to your equipment. If you hear this tone you should immediately shutdown your computer to prevent data loss or corruption.

3. Continuous Beeps for 30 seconds (Back UPS OFFICE 250 and 280 ONLY)
This alarm indicates the unit has detected an Overload condition after it has performed a self-test during start-up.

4. Continuous Two-Tone Beep
This alarm indicates a severe Overload was detected while the unit was on-battery operation. This tone will continue to sound until the unit shuts down.

5. Continuous Tone (On Battery LED will be flashing)
This alarm indicates that the battery-powered outlets are overloaded.

6. Continuous Tone (On Line and On Battery LEDs flashing) Back UPS OFFICE 350, 400, and 500 ONLY
This alarm indicates that an internal UPS fault has occurred.

remove all loads, unplug it, turn it off, wait 1 minute, plug it in, turn it on, apply loads. if this does not solve the problem, replace it.

well try to press the test bottom for one sec and see it work.. and one thing why there a overload maybe u hav plug more the the power consumtion of the ups.. try to seperate the load to other ups or plug to other source. one thing is don every connect your printer to the load it may cause your ups to be overload if depend on your ups watts you are using??? if all this matter is not working it mean your ups is having the hardware issue.. tell how many VA or capitcal of ups u are using? how many load u is there indicator? what type of equiments u are connecting to the ups?? give mi the exact mode like (eg.ED1000RM2U and ED1000RMT2U

ED1500RM2U and ED1500RMT2U).. if you can tell mi all this i will be easy to find out what the cause of the problem..