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Nathan MckaySep 14, 2025
What does Driver Fault mean on my WÄRTSILÄ UPS?
- CCourtney LucasSep 14, 2025
If the WÄRTSILÄ UPS displays 'Driver Fault', it indicates a hardware problem. Replace the inverter.
What does Driver Fault mean on my WÄRTSILÄ UPS?
If the WÄRTSILÄ UPS displays 'Driver Fault', it indicates a hardware problem. Replace the inverter.
What to do if WÄRTSILÄ UPS shows MAIN SOURCE LOST?
If the WÄRTSILÄ UPS indicates 'MAIN SOURCE LOST', it means there's a breaker trip, grid failure, or the grid is out of tolerance. Reconnect AC IN or check the live value.
How to fix a Fan Failure on a WÄRTSILÄ UPS?
If the WÄRTSILÄ UPS displays 'Fan Failure', it could be due to dust on the fan or a failing fan. Try cleaning the fan or replacing it.
What causes a FLASH ERROR on a WÄRTSILÄ UPS?
If the WÄRTSILÄ UPS shows a 'FLASH ERROR', it indicates a T4S failure. Try updating the T4S software or replacing the T4S.
What does Driver In Error mean on my WÄRTSILÄ UPS?
If the WÄRTSILÄ UPS displays 'Driver In Error', it indicates a hardware problem. Replace the inverter.
What does Load Sharing Low mean on my WÄRTSILÄ UPS?
This alarm should disappear by itself. If it stays permanently, the module probably has a problem.
What causes a Boost failure on a WÄRTSILÄ UPS?
If the WÄRTSILÄ UPS displays 'Boost failure', it indicates a hardware problem. Replace the inverter.
What does Calib start error mean on my WÄRTSILÄ UPS?
If the WÄRTSILÄ UPS indicates 'Calib start error', it is an internal error, probably a hardware problem. Replace the inverter.
What does BUS FAIL mean on my WÄRTSILÄ UPS?
Replace the module.
What to do if WÄRTSILÄ UPS displays Freq ACin Too High?
If the WÄRTSILÄ UPS shows 'Freq ACin Too High', check the grid frequency.
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