Fault codes › Solis › Solis S5-GC(75-125)K-US

Solis S5-GC PV ISO-PRO 01/02

Code: PV ISO-PRO 01/02
Shown as: Ground Protect ion
Page: 71
ID: fc:solis-s5-gc-us-pvisopro0102
IRI: https://solarlattice.org/kb/fc/solis-s5-gc-us-pvisopro0102
Status: active
Also known as: PV ISO-PRO 01/02, pvisopro0102, Solis PV ISO-PRO 01/02, Ground Protect ion
Category: Inverters

Class fault verified · fact

Production not stated

Clears after a manual reset verified · fact

Decoded

Reports low insulation resistance; may indicate loss of electrical insulation; look at DC cable, PV array; confirm with insulation resistance testing, fault localization; do: DC wiring check, inverter restart, inverter replacement.

What can be behind Low insulation resistance

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

Defined in

Solis Manual S5 (75-100)K US V2,3(20230623) — Ginlong Solis · 2 · page 71 drafted · lead
- tbl=15.r3 h=7ee4aa6d1521

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 039, 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 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

Same code in other families

Claims

`defined_in`

c1 drafted · lead Solis Manual S5 (75-100)K US V2,3(20230623)

Solis Manual S5 (75-100)K US V2,3(20230623) tbl=15.r3 h=7ee4aa6d1521

`reports`

c2 verified · fact Low insulation resistance

Solis Manual S5 (75-100)K US V2,3(20230623) tbl=15.r3 h=7ee4aa6d1521
Solis_Manual_Solis-1P(6-10)K-4G-US_PLUS_V2.1_20250804 tbl=14.r6 h=01092224fc3d
Solis_Manual_(3.6-5)K_4G_PLUS_LW_USA_03212023 tbl=13.r6 h=01092224fc3d
Solis_Manual_3P(125-255)K_5G_USA_V1.9(20230620) tbl=15.r4 h=94307fcd8bf8
Solis_Manual_RHI-1P(5-10)K-HV_USA_V1.1 tbl=10.r13 h=661ca549c0f6
Solis_Manual_S6-EH1P(3.8-11.4)K-H-US_v.5.6_20260413 tbl=14.r13 h=661ca549c0f6

verified by: review-workflowverified on: 2026-10-20

`detected_by`

c3 verified · fact Insulation resistance testing

Repeat under the same weather as the alarm if first result is normal.

Solis Manual S5 (75-100)K US V2,3(20230623) tbl=15.r3 h=7ee4aa6d1521
Solis_Manual_Solis-1P(6-10)K-4G-US_PLUS_V2.1_20250804 tbl=14.r6 h=01092224fc3d
Solis_Manual_(3.6-5)K_4G_PLUS_LW_USA_03212023 tbl=13.r6 h=01092224fc3d
Solis_Manual_3P(125-255)K_5G_USA_V1.9(20230620) tbl=15.r4 h=94307fcd8bf8
Solis_Manual_RHI-1P(5-10)K-HV_USA_V1.1 tbl=10.r13 h=661ca549c0f6
Solis_Manual_S6-EH1P(3.8-11.4)K-H-US_v.5.6_20260413 tbl=14.r13 h=661ca549c0f6

verified by: review-workflowverified on: 2026-10-20

c4 drafted · lead Fault localization

Solis_Manual_3P(125-255)K_5G_USA_V1.9(20230620) tbl=15.r4 h=94307fcd8bf8
Solis_Manual_RHI-1P(5-10)K-HV_USA_V1.1 tbl=10.r13 h=661ca549c0f6
Solis_Manual_S6-EH1P(3.8-11.4)K-H-US_v.5.6_20260413 tbl=14.r13 h=661ca549c0f6

`affects`

c5 verified · fact DC cable

Solis Manual S5 (75-100)K US V2,3(20230623) tbl=15.r3 h=7ee4aa6d1521
Solis_Manual_Solis-1P(6-10)K-4G-US_PLUS_V2.1_20250804 tbl=14.r6 h=01092224fc3d
Solis_Manual_(3.6-5)K_4G_PLUS_LW_USA_03212023 tbl=13.r6 h=01092224fc3d

verified by: review-workflowverified on: 2026-10-20

c6 drafted · lead PV array

Solis_Manual_3P(125-255)K_5G_USA_V1.9(20230620) tbl=15.r4 h=94307fcd8bf8
Solis_Manual_RHI-1P(5-10)K-HV_USA_V1.1 tbl=10.r13 h=661ca549c0f6
Solis_Manual_S6-EH1P(3.8-11.4)K-H-US_v.5.6_20260413 tbl=14.r13 h=661ca549c0f6

`mitigated_by`

c7 drafted · lead DC wiring check

Solis Manual S5 (75-100)K US V2,3(20230623) tbl=15.r3 h=7ee4aa6d1521
Solis_Manual_Solis-1P(6-10)K-4G-US_PLUS_V2.1_20250804 tbl=14.r6 h=01092224fc3d
Solis_Manual_(3.6-5)K_4G_PLUS_LW_USA_03212023 tbl=13.r6 h=01092224fc3d

review note: support check: partial - Passages say physically check cables, which is roughly a DC cable check, but don't say DC wiring specifically.

c8 drafted · lead Inverter restart

Solis Manual S5 (75-100)K US V2,3(20230623) tbl=15.r3 h=7ee4aa6d1521
Solis_Manual_Solis-1P(6-10)K-4G-US_PLUS_V2.1_20250804 tbl=14.r6 h=01092224fc3d
Solis_Manual_(3.6-5)K_4G_PLUS_LW_USA_03212023 tbl=13.r6 h=01092224fc3d

c9 drafted · lead Inverter replacement

Solis Manual S5 (75-100)K US V2,3(20230623) tbl=15.r3 h=7ee4aa6d1521
Solis_Manual_Solis-1P(6-10)K-4G-US_PLUS_V2.1_20250804 tbl=14.r6 h=01092224fc3d
Solis_Manual_(3.6-5)K_4G_PLUS_LW_USA_03212023 tbl=13.r6 h=01092224fc3d

`has_event_class`

c10 verified · fact Fault (device stops or needs intervention)

Solis Manual S5 (75-100)K US V2,3(20230623) tbl=15.r3 h=7ee4aa6d1521
Solis Manual S5 (75-100)K US V2,3(20230623) tbl=15 h=cb7b6f9ed265

verified by: review-workflowverified on: 2026-10-20

`indicates`

c11 verified · fact Loss of electrical insulation

Solis Manual S5 (75-100)K US V2,3(20230623) tbl=15.r3 h=7ee4aa6d1521

verified by: review-workflowverified on: 2026-10-20

`has_recovery`

c12 verified · fact Manual reset (operator restarts or acknowledges)

Reset after inspection; replace inverter if insulation checks normal and fault persists.

Solis Manual S5 (75-100)K US V2,3(20230623) tbl=15.r3 h=7ee4aa6d1521

verified by: review-workflowverified on: 2026-10-20review note: support check: partial - Solution includes reset inverter and replace inverter, but the passage doesn't say reset is required to clear it or that…

`applies_to`

c13 drafted · lead Solis S5-GC(75-125)K-US

Solis Manual S5 (75-100)K US V2,3(20230623) tbl=15.r3 h=7ee4aa6d1521

Solis S5-GC PV ISO-PRO 01/02

Decoded

What can be behind Low insulation resistance

Defined in

Same condition on other equipment

Same code in other families

Claims

defined_in

reports

detected_by

affects

mitigated_by

has_event_class

indicates

has_recovery

applies_to

Data

`defined_in`

`reports`

`detected_by`

`affects`

`mitigated_by`

`has_event_class`

`indicates`

`has_recovery`

`applies_to`