Solar Lattice

Fault codes › SMA › Sunny Island 4548-US / 6048-US

SMA SI-US W143

Code: W143
Shown as: Inverter undervoltage slave 2
Vendor severity: 1
Page: 210
ID: fc:sma-sunny-island-us-w143
IRI: https://solarlattice.org/kb/fc/sma-sunny-island-us-w143
Status: active
Also known as: W143, w143, SMA W143, Inverter undervoltage slave 2
Category: Inverters

Class warning drafted · lead

Production not stated

Clears not stated

Decoded

Reports inverter undervoltage.

What can be behind Inverter undervoltage

Failure modes that present as the reported condition, and the tests that tell them apart.

Defined in

SI4548-6048-US-BE-en-21W — SMA · page 210 drafted · lead
- tbl=142.r23 h=015c2a9367f7

The manufacturer's own cause and corrective text is not reproduced here.

Same condition on other equipment

SMA: SMA SI-US W142, SMA SI-US W144

Claims

`defined_in`

c1 drafted · lead SI4548-6048-US-BE-en-21W

SI4548-6048-US-BE-en-21W tbl=142.r23 h=015c2a9367f7

`has_event_class`

c2 drafted · lead Warning (device continues, a condition is flagged)

from the Type column

SI4548-6048-US-BE-en-21W tbl=142.r23 h=015c2a9367f7

`reports`

c3 verified · fact Inverter undervoltage

Reported for slave device 2 in a multi-unit cluster.

SI4548-6048-US-BE-en-21W tbl=142.r23 h=015c2a9367f7

verified by: review-workflowverified on: 2026-10-23

`applies_to`

c4 drafted · lead Sunny Island 4548-US / 6048-US

SI4548-6048-US-BE-en-21W tbl=142.r23 h=015c2a9367f7

Data