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Troubleshooting Steps
Step 1. INVERTER POWER indicator LED is not ON.
A. Locate the small violet wire in the front of the inverter. Disconnect the violet wire from the
external remote switch circuit. Connect the violet wire to the large positive DC input lug on
the front of the inverter.
1. If the inverter powers ON, the fault exists in the remote On/Off circuit. Possible
problems include:
• A failed remote circuit fuse.
• A defective switch.
• A defective isolation relay in the circuit open wiring anywhere in the remote On/Off
circuit to the inverter.
• Correct the fault and retest.
B. If the inverter does not power ON, a very low or zero volt input voltage probably exists.
1. Visually inspect or remove and measure the resistance of the battery cable fuses for
evidence of failure.
• Replace any defective fuse with the same rating and retest the system.
NOTE: Repeated fuse failures are probably caused by either a positive cable shorted to
ground (chassis) in the battery system or poor battery cable connections. Locate and correct
the short or poor connections; then, retest the system.
2. If no fuse is defective, the battery/charging system is suspect. Contact Sensata at 1-800-
553-6418 for technical assistance.
Step 2. LOW INPUT VOLTAGE indicator LED is ON.
NOTE: Failures can be caused by one or more of the following: a failed or under-rated
alternator and/or failed alternator regulator, inoperative engine high idler, weak batteries, or
poor battery wiring connections. The least likely part to have failed is the inverter. Contact
Sensata at 1-800-553-6418 for technical assistance.
Step 3. OVERLOAD indicator LED is ON.
A. Switch the inverter OFF, and remove all AC loads from the inverter's output receptacle;
then, disconnect the AC hard wire output inside the front panel of the inverter.
B. Switch the inverter to ON.
1. Inverter appears to operate normally (no indicator LED's) indicates one of the
disconnected AC loads was drawing excessive current or an AC wiring short exists in the
external AC wiring. Correct the fault and retest the system.
2. Overload indicator LED is ON indicating a possible defective inverter. Contact Sensata
at 1-800-553-6418 for technical assistance.
Step 4. HIGH TEMPERATURE indicator LED is ON.
NOTE: Indicates that the inverter has been operated with a somewhat excessive AC load
and has overheated (no damage to the inverter should have occurred).
A. The high temperature condition should self-correct in approximately one (1) minute to one
(1) hour. If the condition persists longer the one (1) hour, contact Sensata at 1-800-553-
6418 for technical assistance.
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