Trane Thermo King 401586, Maintenance Manual, Page: 28 / 36

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TK 56917-11-MM-EN
Power Inverter Diagnostics
Basic Diagnostic Procedures
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If you are not able to get the GFCI outlet to operate using the GFCI Outlet Output Diagnostics section, begin the
diagnostic procedures by:
• Checking the AC voltage at the back of the GFCI outlet inside the truck box or trailer.
• If AC power is present, review the GFCI Outlet Output Diagnostics section again which starts on pg. 23.
• If no AC power is present, review “Diagnostic Procedures using Power Inverter Error Codes,” p. 29 , or review the
following conditions in the diagnostic section:
— No lights on nor flashing on the GFCI outlet on pg. 25.
— Inverter will not Power Up or No Power at GFCI. on pg. 26.
— No Power at GFCI Outlet on this page below.
Table 3. GFCI Outlet Output Diagnostic Procedures
Condition Diagnostic Procedures
No Power at GFCI Outlet
1. Confirm DC disconnect switch located on the outside of the charger box is in the ON position.
a. Rotate knob to ON position.
Note: The power inverter will also need to be turned on anytime the DC disconnect switch was turned OFF.
2. Turn the power inverter ON by pressing the inverter’s power button for one second.
a. A solid green status LED or alternating yellow green LED indicates power inverter is working. Check for
power at GFCI Outlet.
b. Flashing RED Status LED indicates an error condition has been detected and the power inverter has stopped
working.
“Diagnostic Procedures using Power Inverter Error Codes,” p. 29 .
3. Check the 150 Amp fuses; one is located inside the charger box and one is located at the LG battery.
a. Replace fuse(s) if necessary.
b. Check for cause of blown fuse, e.g., poor battery cable connection, cable rubbing and shorted to chassis,
etc.
4. Check 20 Amp fuse located inside charger box.
a. Replace fuse if necessary.
b. Check for cause of blown fuse, e.g., poor battery cable connection, cable rubbing and shorted to chassis,
etc.
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