Fault codes › Schneider Electric › Schneider Electric Conext CL125

Schneider Electric CL125 039

Code: 039
Shown as: Inverter insulation resistance event (ISO-flt)
Page: 127
ID: fc:schneider-electric-conext-cl125-39
IRI: https://solarlattice.org/kb/fc/schneider-electric-conext-cl125-39
Status: active
Also known as: 039, 39, Schneider Electric 039, Inverter insulation resistance event (ISO-flt)
Category: Inverters

Class not stated

Production stops drafted · lead

Clears by itself drafted · lead

Decoded

Reports low insulation resistance; confirm with insulation resistance testing.

What can be behind Low insulation resistance

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

Defined in

Conext CL125 Owners Guide 975-0793 RevA — Schneider Electric drafted · lead
- tbl=51.r4 h=de1c37f1f982
Conext CL125 Modbus App Note — Schneider Electric drafted · lead
- tbl=31.r4 h=7c22df9d7d73

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 E025, ABB / FIMER PVS-166-175-TL E037, ABB / FIMER PVS-60-TL E025, ABB / FIMER PVS-60-TL E037, ABB / FIMER TRIO-20.0-27.6-TL E025, ABB / FIMER TRIO-20.0-27.6-TL E037, ABB / FIMER UNO-DM-3.3-5.0-PLUS E025, ABB / FIMER UNO-DM-6.0-PLUS E025
CPS: CPS SCA25KTL-208 IsolationErr, CPS SCA25KTL-480 IsolationErr, CPS SCA36KTL IsolationErr, CPS SCA50-100K-T Protect0190, CPS SCA50-60KTL IsolationErr, CPS SCH100-125KTL IsolationErr, CPS SCH125KTL-AIO IsolationErr, CPS SCH200-250K-T IsolationErr, CPS SCH275KTL IsolationErr, CPS SCH350KTL IsolationErr
Canadian Solar: Canadian Solar 125K-T600GL02 PV ISO-PRO 01/02, Canadian Solar 125K-T600GL02 PV-MID-ISO, Canadian Solar 185-255K PV ISO-PRO 01/02, Canadian Solar 23-28KTL-CT IsolationErr, Canadian Solar 25-40K-T480GL01 PV ISO-PRO 01/02, Canadian Solar 50-66K-T480GL01 PV ISO-PRO 01/02, Canadian Solar 75-100K-T480GL02 PV ISO-PRO 01/02
Enphase: Enphase IQ7 DC Resistance Low - Power Off, Enphase IQ8 DC Resistance Low - Power Off, Enphase IQ9N DC Resistance Low - Power Off, Enphase M215-M250 DC Resistance Low - Power Off
Fronius: Fronius Galvo 502, Fronius Primo 447, Fronius Primo 502, Fronius Symo 447, Fronius Symo 502
Huawei: Huawei SUN2000-100KTL-USH0 2062, Huawei SUN2000-25-30KTL-US 313, Huawei SUN2000-45KTL-US-HV-D0 313
KACO new energy: KACO new energy blueplanet TL3 181, KACO new energy blueplanet TL3 182, KACO new energy blueplanet TL3 183
SMA: SMA SB-US-40 3501, SMA SB-US-41 3501, SMA SBSE-US-50 3501, SMA PEAK3-US 3501, SMA CORE1-US 3501, SMA STP-TL-US 3501, SMA STP-X-US 3501, SMA SC-CP-XT 3501, SMA SC-CP-XT 3504, SMA SC-CP-XT 3510, SMA SC-CP-XT 3511
Schneider Electric: Schneider Electric CL125 055
Solis: Solis 1P-4G-US PV ISO-PRO 01/02, Solis 3P-5G-US PV ISO-PRO 01/02, Solis RHI-1P-HV PV ISO-PRO 01/02, Solis S5-GC PV ISO-PRO 01/02, Solis S6-EH1P PV ISO-PRO 01/02, Solis S6-GC PV ISO-PRO 01/02, Solis S6-GU PV ISO-PRO 01/02
Sungrow: Sungrow SG-CX-US 039, Sungrow SG200HX 039, Sungrow SG250HX 39, Sungrow SG350HX 039
Yaskawa Solectria: Yaskawa Solectria PVI-25TL-R IsolationErr, Yaskawa Solectria PVI-TL IsolationErr

Claims

`defined_in`

c1 drafted · lead Conext CL125 Owners Guide 975-0793 RevA

Conext CL125 Owners Guide 975-0793 RevA tbl=51.r4 h=de1c37f1f982

c2 drafted · lead Conext CL125 Modbus App Note

Conext CL125 Modbus App Note tbl=31.r4 h=7c22df9d7d73

`reports`

c3 verified · fact Low insulation resistance

Conext CL125 Owners Guide 975-0793 RevA tbl=51.r4 h=de1c37f1f982
Conext CL125 Modbus App Note tbl=31.r4 h=7c22df9d7d73

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

`detected_by`

c4 drafted · lead Insulation resistance testing

Conext CL125 Owners Guide 975-0793 RevA tbl=51.r4 h=de1c37f1f982
Conext CL125 Modbus App Note tbl=31.r4 h=7c22df9d7d73

review note: support check: partial - Passages say to test wiring insulation as a remedy, not that the event is detected by insulation resistance testing.