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| Symptom | Possible Cause | What To Do |
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| UPS will not turn on | On/Off/Test button not | Press and release the On/Off/ |
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| pushed | Test button to start UPS |
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| UPS operates in | Input AC circuit breaker is | Reset circuit breaker by |
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| battery mode only, | tripped | pressing the plunger back in. |
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| even though there |
| If the AC circuit breaker trips |
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| is normal AC |
| after UPS starts up, reduce |
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| present |
| the load on the UPS |
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| Fault LED is | UPS has detected an | Call for service |
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| illuminated | internal fault |
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| Site Wiring Fault | Incorrect service wiring | Have a Qualified Electrician |
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| LED is illuminated |
| correct the service wiring |
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| The AC normal | The UPS is being | Disconnect the computer |
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| LED is illuminated, | controlled via its | cable from the UPS and press |
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| but there is no out- | communications port | the On button. If UPS works |
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| put |
| normally, the software has |
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| control of the UPS |
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| UPS does not | The batteries may be weak | Charge the batteries for 8- |
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| provide expected | or at the end of useful | hours and retest. If the runtime |
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| runtime | service life | is still less than expected, the |
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| batteries may need to be |
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| replaced, even though the |
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| Weak/Bad Battery LED is not |
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| illuminated |
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| Weak/Bad Battery | Loose connections at the | Check battery connections, |
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| LED is illuminated | batteries, Weak batteries, | charge the batteries for 8- |
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| Bad batteries | hours, replace the batteries |
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| UPS occasionally | Normal operation | The UPS is performing its |
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| emits a beep |
| intended function |
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| Overload LED is | The load has exceeded the | Check the specifications (see |
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| illuminated and a | UPS's capacity | section 8). Remove part of |
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| constant alarm |
| the load |
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| The Boost LED or | The UPS is in either the | The UPS is performing its |
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| Buck LED is blink- | Boost mode or the Buck | intended function |
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| ing. | mode |
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