WFCO Power Converter: “DC fuse red LED (blown fuse)”
warning RV power converter problems
What it means
Each of the eleven DC fuse positions on the WF-8900 fuse board has its own small red LED. When a circuit's blade fuse blows, that position's red LED lights up, pinpointing which 12 V circuit lost power. It indicates a blown fuse on that branch, not a converter fault.
Most likely causes
- An overload or short on that branch circuit drew more current than the fuse rating most likely
- A pinched or chafed wire shorting to ground on the affected circuit common
- A failed 12 V appliance on that circuit less common
Safe checks you can do yourself
- Look for the lit red LED next to a fuse position (note: these are tiny surface-mount LEDs, barely visible).
- Pull the suspect fuse and inspect it for a broken element.
- Replace with a known-good ATC/ATO fuse of the same amperage (20 A on standard positions, 30 A on F10/F11).
- If the new fuse blows again, that circuit has a short or overload that must be found before re-fusing.
How to reset / clear DC fuse red LED (blown fuse)
- Replace the blown fuse with the same type and rating; the red LED goes out when a good fuse restores the circuit.
- Do not install a higher-rated fuse to stop repeat blowing.
When to call a technician
A replacement fuse blows again immediately, multiple circuit LEDs light at once, or you cannot locate the short.
Applies to
WF-8935-AD · WF-8945-AD · WF-8955-AD · WF-8965-AD · WF-8975-AD
FAQ
What does WFCO Power Converter code "DC fuse red LED (blown fuse)" mean?
Each of the eleven DC fuse positions on the WF-8900 fuse board has its own small red LED. When a circuit's blade fuse blows, that position's red LED lights up, pinpointing which 12 V circuit lost power. It indicates a blown fuse on that branch, not a converter fault.
How do I reset WFCO Power Converter DC fuse red LED (blown fuse)?
Replace the blown fuse with the same type and rating; the red LED goes out when a good fuse restores the circuit. Do not install a higher-rated fuse to stop repeat blowing.
What is the most common cause of DC fuse red LED (blown fuse) on a WFCO Power Converter?
The most likely cause is an overload or short on that branch circuit drew more current than the fuse rating.
Related · WFCO power converter
On a WF-8900-AD Auto-Detect power center, an integrated LED … No DC output / reverse polarity
If a WF-8900-AD power center produces no 12 V output, WFCO's…
Sources
- Operator's Manual WF-8900-AD Series Power Center — Blown Fuse Indicators on DC Fuse Board - red LED per circuit (WFCO / Arterra Distribution)
Note: The board has 11 DC circuits; positions F10/F11 are 30 A (slide-outs/high loads), the other nine are 20 A max. LEDs are surface-mount and dim, easy to miss in daylight.
● Last verified 2026-06-29 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual.