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