Preventive Maintenance and
Trouble Shooting Procedure
IT SERIES Industrial True Sine Wave Inverter Owners Manual 25
Problem: Overload Indicator Light is ON when AC load is applied.
Check: Verify AC load is within the inverter’s rated capacity. Remove excessive loads.
Problem: DC fuse blows when connecting DC input cables.
Check: Check for reverse polarity (Positive and negative DC cables reversed.)
Problem: Excessive audible buzzing during inverter operation but inverter operates loads.
Check: Check mounting bracket bolt tightness.
Problem: AC loads do not seem to be fully energized when operating from inverter power.
Check: Check AC output voltage at convenience receptacle. Check for overheated DC or AC wiring.
Verify AC load specifications are not exceeded.
Problem: Unit does not operate and a “burnt wire” smell emits from inverter.
Check: Disconnect AC loads and battery immediately. Unit may require service, contact Vanner
service department.
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