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Fault codes › Solis › Solis S6-EH3P(75-150)K10-NV-YD-H-US

Solis S6-EH3P75-150K UN-BUS01

Code: UN-BUS01
Shown as: DC bus undervoltage
Page: 117
ID: fc:solis-s6-eh3p-75-150k-us-unbus01
IRI: https://solarlattice.org/kb/fc/solis-s6-eh3p-75-150k-us-unbus01
Status: active
Also known as: UN-BUS01, unbus01, Solis UN-BUS01, DC bus undervoltage
Category: Inverters

Class fault drafted · lead

Production not stated

Clears after a manual reset drafted · lead

Decoded

Reports DC bus undervoltage; do: inverter restart.

What can be behind DC bus undervoltage

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

Defined in

Solis_Manual_S6-EH3P(75-150)K10-NV-YD-H-US_V1.0 — Solis (Ginlong) · page 117 drafted · lead
- tbl=28.r9 h=95889b380ed6

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

Same condition on other equipment

ABB / FIMER: ABB / FIMER PVS-166-175-TL E010, ABB / FIMER PVS-166-175-TL W011, ABB / FIMER PVS-60-TL E010, ABB / FIMER PVS-60-TL W011, ABB / FIMER TRIO-20.0-27.6-TL E010, ABB / FIMER TRIO-20.0-27.6-TL W011, ABB / FIMER UNO-DM-3.3-5.0-PLUS E010, ABB / FIMER UNO-DM-3.3-5.0-PLUS W011, ABB / FIMER UNO-DM-6.0-PLUS E010, ABB / FIMER UNO-DM-6.0-PLUS W011
CPS: CPS SCA50-100K-T Fault6080
Canadian Solar: Canadian Solar 125K-T600GL02 UN-BUS, Canadian Solar 125KTL-GS-E UN-BUS, Canadian Solar 185-255K UN-BUS01/02, Canadian Solar 25-40K-T480GL01 UN-BUS, Canadian Solar 25-40KTL-GS-FL UN-BUS, Canadian Solar 50-66K-T480GL01 UN-BUS, Canadian Solar 50-66KTL-GS-FL UN-BUS, Canadian Solar 75-100K-T480GL02 UN-BUS
Fronius: Fronius Primo 443, Fronius Symo 443
KACO new energy: KACO new energy blueplanet TL3 84
Solis: Solis 1P-4G-US UN-BUS, Solis 3P-5G-US UN-BUS01/02, Solis RHI-1P-HV UN-BUS01/02, Solis S5-GC UN-BUS, Solis S6-EH1P UN-BUS01/02, Solis S6-EH2P UN-BUS01, Solis S6-EH3P30-60K UN-BUS01, Solis S6-GC UN-BUS, Solis S6-GU UN-BUS

Same code in other families

Claims

`defined_in`

c1 drafted · lead Solis_Manual_S6-EH3P(75-150)K10-NV-YD-H-US_V1.0

Solis_Manual_S6-EH3P(75-150)K10-NV-YD-H-US_V1.0 tbl=28.r9 h=95889b380ed6

`reports`

c2 drafted · lead DC bus undervoltage

Solis_manual_S6-EH2P(9.6-16)K-SV-YD-L-US_V2.7_20260305 tbl=16.r9 h=143a67665ac9
Solis_Manual_S6-EH3P(30-60)K-NV-YD-H-US(21A)_V1_0_20260908 tbl=27.r9 h=95889b380ed6
Solis_Manual_S6-EH3P(75-150)K10-NV-YD-H-US_V1.0 tbl=28.r9 h=95889b380ed6

`mitigated_by`

c3 verified · fact Inverter restart

Solis_manual_S6-EH2P(9.6-16)K-SV-YD-L-US_V2.7_20260305 tbl=16.r9 h=143a67665ac9
Solis_Manual_S6-EH3P(30-60)K-NV-YD-H-US(21A)_V1_0_20260908 tbl=27.r9 h=95889b380ed6
Solis_Manual_S6-EH3P(75-150)K10-NV-YD-H-US_V1.0 tbl=28.r9 h=95889b380ed6

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

`has_event_class`

c4 drafted · lead Fault (device stops or needs intervention)

Solis_manual_S6-EH2P(9.6-16)K-SV-YD-L-US_V2.7_20260305 tbl=16.r9 h=143a67665ac9
Solis_Manual_S6-EH3P(30-60)K-NV-YD-H-US(21A)_V1_0_20260908 tbl=27.r9 h=95889b380ed6
Solis_Manual_S6-EH3P(75-150)K10-NV-YD-H-US_V1.0 tbl=28.r9 h=95889b380ed6

review note: support check: partial - Fault class is not stated; implied by restart-and-confirm-fault-continues wording.

`has_recovery`

c5 drafted · lead Manual reset (operator restarts or acknowledges)

Solis_manual_S6-EH2P(9.6-16)K-SV-YD-L-US_V2.7_20260305 tbl=16.r9 h=143a67665ac9
Solis_Manual_S6-EH3P(30-60)K-NV-YD-H-US(21A)_V1_0_20260908 tbl=27.r9 h=95889b380ed6
Solis_Manual_S6-EH3P(75-150)K10-NV-YD-H-US_V1.0 tbl=28.r9 h=95889b380ed6

`applies_to`

c6 drafted · lead Solis S6-EH3P(75-150)K10-NV-YD-H-US

Solis_Manual_S6-EH3P(75-150)K10-NV-YD-H-US_V1.0 tbl=28.r9 h=95889b380ed6

Data