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

SMA SI-US W857

Code
W857
Vendor severity
1
Page
217
ID
fc:sma-sunny-island-us-w857
IRI
https://solarlattice.org/kb/fc/sma-sunny-island-us-w857
Status
active
Also known as
W857, w857, SMA W857
Category
Inverters
Class warning drafted · lead
Production not stated
Clears not stated

Decoded

Reports communication loss; look at PV charge controller.

What can be behind Communication loss

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

Tell apartByHow
Device firmware defect vs Monitoring network configuration fault drafted · leadCommunication test proposedSwitch the Modbus TCP server parameter off and back on. If communication returns, the problem is limited to Modbus TCP. If it stays down, check the network cabling and RJ45 connections.

Defined in

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

Same condition on other equipment

ABB / FIMER
ABB / FIMER PVS-60-TL W030
CPS
CPS SCA36KTL CommErr, CPS SCA50-60KTL CommErr
Fronius
Fronius Symo 420
SMA
SMA SB-US-40 10252, SMA SB-US-40 10284, SMA SB-US-40 10286, SMA SB-US-40 10341, SMA SB-US-40 10345, SMA SB-US-40 10346, SMA SB-US-40 10347, SMA SB-US-40 10348, SMA SB-US-40 10349, SMA SB-US-40 10350, SMA SB-US-40 10351, SMA SB-US-40 10352, SMA SB-US-40 10353, SMA SB-US-40 7619, SMA SB-US-40 8708, SMA SB-US-41 10249, SMA SB-US-41 10252, SMA SB-US-41 10284, SMA SB-US-41 10286, SMA SB-US-41 10341, SMA SB-US-41 10345, SMA SB-US-41 10346, SMA SB-US-41 10347, SMA SB-US-41 10348, SMA SB-US-41 10349, SMA SB-US-41 10350, SMA SB-US-41 10351, SMA SB-US-41 10352, SMA SB-US-41 10353, SMA SB-US-41 7619, SMA SB-US-41 8708, SMA SBSE-US-50 8104, SMA SBSE-US-50 8708, SMA SBSE-US-50 8709, SMA SBSE-US-50 8710, SMA SBSE-US-50 9308, SMA PEAK3-US 10249, SMA PEAK3-US 10252, SMA PEAK3-US 7619, SMA PEAK3-US 8101, SMA PEAK3-US 8708, SMA PEAK3-US 8709, SMA PEAK3-US 8710, SMA CORE1-US 10249, SMA CORE1-US 10252, SMA CORE1-US 10284, SMA CORE1-US 10286, SMA CORE1-US 7619, SMA CORE1-US 8101, SMA CORE1-US 8102, SMA CORE1-US 8103, SMA CORE1-US 8104, SMA STP-TL-US 8101-8104, SMA STP-TL-US 8708, SMA STP-TL-US 8709, SMA STP-TL-US 8710, SMA STP-X-US 8708, SMA STP-X-US 8709, SMA STP-X-US 8710, SMA SI-US F733, SMA SI-US F754, SMA SI-US W734, SMA SI-US W735, SMA SI-US W736, SMA SI-US W867, SMA SI-US W877, SMA SI-US W887
Solis
Solis S6-EH2P CAN Fail, Solis S6-EH3P30-60K CAN Fail, Solis S6-EH3P75-150K CAN Fail, Solis S6-GC DRM LINK Fail, Solis S6-GU DRM LINK Fail
Sungrow
Sungrow SG200HX 514, Sungrow SG200HX 75, Sungrow SG250HX 514, Sungrow SG250HX 75, Sungrow SG350HX 514, Sungrow SG350HX 75
Yaskawa Solectria
Yaskawa Solectria XGI-1500-1MW WARN-28, Yaskawa Solectria XGI-1500-DCG WARN-28, Yaskawa Solectria XGI-1500 WARN-28

Claims

defined_in

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

has_event_class

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

from the Type column

reports

c3 drafted · lead Communication loss

No communication for more than 24 hours

affects

c4 verified · fact PV charge controller

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

applies_to

c5 drafted · lead Sunny Island 4548-US / 6048-US

Data