Vanner Power Group
20-1000TUL INVERTER—OWNER'S MANUAL
Section 7: Troubleshooting the 20-1000TUL
The following are the most common questions heard by Vanner service professionals.
If your situation does not apply to the following categories, please contact your local
Vanner Power Group Service Center.
Vanner Power Group Customer Service:
1-800-AC-POWER
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The LEDs on the front panel blink in sequence.
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It is normal for this to occur if the inverter switch is On when the DC input is connected to the unit.
If the DC is already connected and the LEDs blink in sequence then the DC input voltage is dropping.
Check for poor connections in the DC wiring, bad battery or a heavy DC load.
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ON lamp does not light steadily after pushing in the ON-OFF/RESET
Inverter
Switch.
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Lamp flashes when utility power is present.
Lamp flashes in Load Demand Waiting mode.
Check/Reset GFCI on the receptacle.
Check battery connections if utility power is OFF.
Check DC fuses if utility power is OFF.
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ON lamp fully illuminates. AC load does not run.
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Check and reset circuit breaker.
Verify AC load and cord are in proper condition.
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BATTERY LOW lamp illuminates when AC load is applied.
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Check battery connections.
Check battery condition.
Recharge battery if voltage is less than 10.5 VDC.
Check AC loads for shorted circuit.
Check the vehicle's alternator charging system for proper operation.
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OVERTEMP lamp illuminates.
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Something has caused the unit to overheat. Check for obstruction of air flow to the cooling fan or from
ventilation holes.
Verify AC load is within unit’s rated
capacity.
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OVERLOAD lamp illuminates with AC load applied.
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Verify AC load is within unit’s rated capacity.
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DC fuse blows when connecting DC input cables.
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Check for reverse polarity: red cable to battery positive (+), black cable to battery negative (-). The
unit may be damaged and require repair service.
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