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  5. UPS Repair & Troubleshooting

UPS Repair & Troubleshooting

Diagnosis for offline, line-interactive and online double-conversion UPS systems, including bypass behaviour, battery autonomy and the generator interaction that causes most critical-power failures.

Will not power on1 guideBypass faults1 guideBattery and autonomyfaults2 guidesRectifier and inverterfaults1 guideGenerator interaction1 guideUPS
Fault domains for UPS. Solid outline means a published guide covers that domain; dashed means the guide is not yet written. 5 of 5 covered.

What this covers

  • ▪Will not power on — UPS Will Not Power On
  • ▪Bypass faults — Online UPS Bypass Fault
  • ▪Battery and autonomy faults — Replacing a UPS Battery String Safely, UPS Not Charging Batteries
  • ▪Rectifier and inverter faults — UPS Inverter Fault
  • ▪Generator interaction — UPS Running on Battery While Mains Is Present

Diagnosis guides

  • Online UPS Bypass Fault — Diagnosis and Repair

    Online double-conversion UPS systems with static bypass, single- and three-phase, including modular and parallel installations

    8 diagnostic steps · advanced · qualified electrician

  • UPS Inverter Fault — Diagnosis and Repair

    Online double-conversion UPS systems, single- and three-phase, including modular and parallel installations

    8 diagnostic steps · advanced · qualified electrician

  • Replacing a UPS Battery String Safely

    VRLA and lithium battery strings in single- and three-phase UPS systems, cabinet and rack mounted

    9 diagnostic steps · advanced · qualified electrician

  • UPS Not Charging Batteries — Diagnosis and Repair

    Offline, line-interactive and online double-conversion UPS systems, single- and three-phase, with VRLA or lithium battery strings

    10 diagnostic steps · advanced · qualified electrician

  • UPS Running on Battery While Mains Is Present — Diagnosis and Repair

    Offline, line-interactive and online double-conversion UPS systems, single- and three-phase, on mains or generator supply

    10 diagnostic steps · advanced · qualified electrician

  • UPS Will Not Power On — Dead Front Panel Diagnosis

    Offline, line-interactive and online double-conversion UPS, single-phase and three-phase, tower and rack, with internal or external battery cabinets

    8 diagnostic steps · intermediate · qualified electrician

Want us to do the work?

These guides are written so you can diagnose the fault yourself. If you would rather an engineer handled it, our mobile workshop covers all 47 counties.

UPS Repair & Troubleshooting servicesTalk to an engineer

Related categories

  • Inverter Repair & Troubleshooting
  • Generator Repair & Troubleshooting
  • ATS & Changeover Panel Diagnosis
  • PCB & Motherboard Repair