Fault codes › Canadian Solar › CSI-125KTL-GS-E

Canadian Solar 125KTL-GS-E OV-BUS

Code: OV-BUS
Shown as: DC BUS voltage is too high
Page: 36
ID: fc:canadian-solar-125ktl-gs-e-ovbus
IRI: https://solarlattice.org/kb/fc/canadian-solar-125ktl-gs-e-ovbus
Status: active
Also known as: OV-BUS, ovbus, Canadian Solar OV-BUS, DC BUS voltage is too high
Category: Inverters

Class not stated

Production not stated

Clears needs service drafted · lead

Decoded

Reports DC bus overvoltage; look at inverter choke inductor; confirm with DC voltage measurement; do: wiring and terminal check, inverter replacement.

What can be behind DC bus overvoltage

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

Defined in

CSI Installation Manual CSI-125KTL-GS-E USA V1.3 — Canadian Solar (CSI) · page 36 drafted · lead
- tbl=10.r4 h=b12dcab6c84e

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 E029, ABB / FIMER PVS-166-175-TL E004, ABB / FIMER PVS-60-TL E029, ABB / FIMER PVS-60-TL E004, ABB / FIMER TRIO-20.0-27.6-TL E029, ABB / FIMER TRIO-20.0-27.6-TL E004, ABB / FIMER UNO-DM-3.3-5.0-PLUS E029, ABB / FIMER UNO-DM-3.3-5.0-PLUS E004, ABB / FIMER UNO-DM-6.0-PLUS E029, ABB / FIMER UNO-DM-6.0-PLUS E004
CPS: CPS SCA25KTL-208 Fault0130, CPS SCA25KTL-208 Fault0020, CPS SCA25KTL-208 Protect0110, CPS SCA25KTL-208 Protect0090, CPS SCA25KTL-480 Fault0130, CPS SCA25KTL-480 Fault0020, CPS SCA25KTL-480 Protect0110, CPS SCA25KTL-480 Protect0090, CPS SCA50-100K-T Fault7000, CPS SCA50-100K-T PFault0000, CPS SCA50-100K-T PFault0110, CPS SCA50-100K-T Protect0000, CPS SCA50-100K-T Protect0110, CPS SCA50-100K-T Protect0300, CPS SCA50-100K-T Protect0090, CPS SCH100-125KTL Fault0130, CPS SCH100-125KTL Fault0020, CPS SCH100-125KTL Protect0110, CPS SCH100-125KTL Protect0090, CPS SCH125KTL-AIO Fault0130, CPS SCH125KTL-AIO Fault0020, CPS SCH125KTL-AIO Protect0110, CPS SCH125KTL-AIO Protect0090, CPS SCH200-250K-T Fault0130, CPS SCH200-250K-T Fault0030, CPS SCH200-250K-T Protect0000, CPS SCH200-250K-T Protect0300, CPS SCH275KTL Fault0130, CPS SCH275KTL Fault0020, CPS SCH275KTL Protect0110, CPS SCH275KTL Protect0090, CPS SCH350KTL Fault0130, CPS SCH350KTL Fault0020, CPS SCH350KTL Protect0110, CPS SCH350KTL Protect0090
Canadian Solar: Canadian Solar 125K-T600GL02 OV-BUS, Canadian Solar 185-255K OV-BUS, Canadian Solar 25-40K-T480GL01 OV-BUS, Canadian Solar 25-40KTL-GS-FL OV-BUS, Canadian Solar 50-66K-T480GL01 OV-BUS, Canadian Solar 50-66KTL-GS-FL OV-BUS, Canadian Solar 75-100K-T480GL02 OV-BUS
Fronius: Fronius Galvo 308, Fronius Primo 489, Fronius Symo 308, Fronius Symo 489
KACO new energy: KACO new energy blueplanet TL3 216, KACO new energy blueplanet TL3 35, KACO new energy blueplanet TL3 85
SMA: SMA STP-X-US 6405, SMA SC-CP-XT 6405
Schneider Electric: Schneider Electric CL125 019, Schneider Electric CL125 020
Solis: Solis 1P-4G-US OV-BUS, Solis 3P-5G-US OV-BUS, Solis RHI-1P-HV OV-BUS, Solis S5-GC OV-BUS, Solis S6-EH1P OV-BUS, Solis S6-EH2P OV-BUS, Solis S6-EH2P OV-BUS-H, Solis S6-EH3P30-60K OV-BUS, Solis S6-EH3P30-60K OV-BUS-H, Solis S6-EH3P75-150K OV-BUS, Solis S6-EH3P75-150K OV-BUS-H, Solis S6-GC OV-BUS, Solis S6-GU OV-BUS
Yaskawa Solectria: Yaskawa Solectria PVI-25TL-R Fault0130, Yaskawa Solectria PVI-25TL-R Fault0020, Yaskawa Solectria PVI-25TL-R Protect0110, Yaskawa Solectria SGI-XTM DC Overshoot

Same code in other families

Claims

verified by: review-workflowverified on: 2026-10-23review note: support check: partial - Passage says check inverter inductor connection, which implies but does not state the choke is affected.