Error codes › Inverters › WFCO WF-5110 / WF-5118 / WF-5120 › Yellow LED on (battery backup mode - normal)
WFCO WF-5110 / WF-5118 / WF-5120 error code Yellow LED on (battery backup mode - normal)
The YELLOW LED indicates battery backup status - the inverter is supplying AC power from the 12 V battery (no shore/utility AC present). This is NORMAL operation, NOT a fault.
What to check, and in what order, is in the app. The flow WFCO Inverter (WF-5110 / WF-5118 / WF-5120) — fault diagnostic walks this code step by step with the pass/fail measurements, wiring schematics and procedures that go with it, and it works offline in the bay.
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- WFCO_WF-5100_Series_Inverter_Users_Manual.pdf