125
EN-US
421
PCB number has been set incorrectly
Description The inverter stops feeding power into the grid, the display
shows a critical error via a red Operating Status LED.
Remedy If status code persists: Contact a Fronius-trained service tech-
nician
425
Communication with the power stage set is not possible
Description The Operating Status LED lights up orange, then the inverter at-
tempts a restart.
Remedy If status code persists: Contact a Fronius-trained service tech-
nician
431
All power stage sets are in boot mode
Description The inverter stops feeding power into the grid, the display
shows a critical error via a red Operating Status LED.
Remedy Update firmware using Bootloader or Fronius Solar.update/IG
Plus
Switches between SLAVE / DC LOW or SLAVE / POWER LOW (439)
The MPP master power stage set is switched off because of an error in a slave power
stage set (in the balance mode).
Description The inverter stops feeding power into the grid, the display
shows a critical error via a red Operating Status LED.
Remedy If status code persists: Contact a Fronius-trained service tech-
nician
Switches between SLAVE / DC LOW or SLAVE / POWER LOW (439)
The MPP master power stage set is switched off because of a fauilty GFDI fuse.
Description The inverter stops feeding power into the grid, the display
shows a critical error via a red Operating Status LED.
Remedy Check the GFDI fuse and replace it, if necessary.
If status code persists: Contact a Fronius-trained service tech-
nician
442
No phase master for a phase
Description The inverter stops feeding power into the grid, the display
shows a critical error via a red Operating Status LED.
Remedy If status code persists: Contact a Fronius-trained service tech-
nician
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