In this failure, the fuse that connects the PV array (solar module) to ground has blown or is faulty. Depending on the inverter, the inverter may stop feeding power into the grid, or it may only show a warning on its display. Ground fault protection alarms can also point to this fault, because a blown negative grounding fuse is one of the listed things to check. To confirm, let the capacitors discharge fully, take out the negative grounding fuse and check whether it has blown. On some units, a lit LED on the GFDI shows that the fuse needs replacing. Replace the ground fuse. Also check that the negative pole is securely grounded and, on medium-voltage units, that the transformer neutral is connected and grounded. If the fault keeps coming back, contact the system installer or the manufacturer's service team.
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affectsc1 verified · fact PV ground fuse
tbl=18.r17 h=21a2fd000df8tbl=19.r4 h=17801abf0e61tbl=51.r4 h=bfc22e660bc0tbl=50.r3 h=70fd2314506ctbl=45.r4 h=5c09b5ed0638verified by: review-workflowverified on: 2026-10-23
presents_asc2 verified · fact Inverter shutdown
Fronius Galvo status 472: the inverter stops feeding energy into the grid.
tbl=18.r17 h=21a2fd000df8verified by: review-workflowverified on: 2026-10-23
c3 verified · fact Ground fault alarm or trip
Ground fault protection (GFDI) faults list a blown negative grounding fuse as something to check.
tbl=24 h=abb49edd4919tbl=24.r2 h=fb859c54d997tbl=50.r3 h=70fd2314506ctbl=45.r4 h=5c09b5ed0638verified by: review-workflowverified on: 2026-10-23
detected_byc4 verified · fact Inverter display check
Fronius Galvo status 551 shows a warning message on the display.
tbl=19.r4 h=17801abf0e61verified by: review-workflowverified on: 2026-10-23
c5 verified · fact Fuse inspection
Take out the negative grounding fuse and check whether it has blown.
tbl=51.r4 h=bfc22e660bc0tbl=50.r3 h=70fd2314506ctbl=45.r4 h=5c09b5ed0638verified by: review-workflowverified on: 2026-10-23
c6 verified · fact GFDI indicator LED check
If the LED on the GFDI is lit, replace the fuse.
tbl=24 h=abb49edd4919tbl=24.r2 h=fb859c54d997verified by: review-workflowverified on: 2026-10-23
mitigated_byc7 verified · fact Ground fuse replacement
tbl=18.r17 h=21a2fd000df8tbl=19.r4 h=17801abf0e61tbl=24 h=abb49edd4919tbl=24.r2 h=fb859c54d997verified by: review-workflowverified on: 2026-10-23
c8 verified · fact Contact system installer
Do this if the status code keeps coming back.
tbl=18.r17 h=21a2fd000df8tbl=19.r4 h=17801abf0e61verified by: review-workflowverified on: 2026-10-23
c9 drafted · lead Contact manufacturer service
tbl=24 h=abb49edd4919tbl=24.r2 h=fb859c54d997review note: support check: partial - The GFDIErr row says to contact the after-sales service center, but it is a grounding fault entry and not clearly tied to a fuse failure.; review: partial - The CHINT GFDIErr row does say to contact the after-sales service center, but that advice is for a general grounding fault, not specifically for a ground fuse failure.
c10 verified · fact Safety isolation
Wait until the capacitors have fully discharged before you remove the grounding fuse.
tbl=51.r4 h=bfc22e660bc0verified by: review-workflowverified on: 2026-10-23
c11 verified · fact Grounding conductor check
Check that the inverter negative pole is securely grounded. For MV units, also check the transformer neutral point and the PT/CT neutral grounding.
tbl=51.r4 h=bfc22e660bc0tbl=50.r3 h=70fd2314506ctbl=45.r4 h=5c09b5ed0638verified by: review-workflowverified on: 2026-10-23
indicates c2indicates c2