VANNER Incorporated
VLT Series True Sine Wave Inverter - Owner’s Manual16
Problem Symptoms and Troubleshooting Checks
Problem: Inverter Indicator Light does not turn ON.
Check: Verify DC voltage at the inverter.
Problem: Inverter Indicator Light is ON but the AC load will not operate.
Check: Check and reset GFCI receptacle or circuit breakers. Verify AC wiring. Try a different load such as
a trouble light. Turn load demand OFF (DIP switch #4 up).
Problem: Low Battery Indicator Light is ON when AC load is applied.
Check: Check battery connections and condition. Recharge battery if voltage is less than 10.5 (21.0)
VDC.
Problem: Over Temperature Indicator Light is ON.
Check: Verify fan operation. Remove obstructions from air exhaust vents and cooling fan.
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 “burned wire” smell emits from inverter.
Check: Disconnect AC loads and battery immediately. Unit likely will require service, contact Vanner
service department.
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