Error 18x8F indicates that the inverter's Residual Current Monitoring Unit (RCMU) detected an insulation resistance between the DC PV array conductors and protective earth (PE) below the safety threshold (typically <600kΩ on residential systems). The inverter halts grid injection to prevent electric shock or fire hazards.

⏱ 45-75 Mins Troubleshoot →

CODE 3x8A Home Hub Inverter Series Critical

DC Arc Fault Detected

The integrated Arc Fault Circuit Interrupter (AFCI) detected high-frequency electrical noise characteristic of an electric arc in the DC string circuit (UL 1699B compliance). The inverter has ceased power export and opened internal safety contactors to prevent thermal escalation or fire hazard.

⏱ 45-90 Mins Troubleshoot →

CODE 18xBD Home Hub Inverter High

DC Isolation Leakage Current Fault

Error 18xBD indicates an RISO/isolation fault where the DC bus isolation resistance to earth has dropped below the safety limit (typically <600 kΩ for single-phase or <1 MΩ for three-phase), causing an excessive residual/leakage current detection prior to grid connection.

⏱ 30-60 Mins Troubleshoot →

CODE 18x86 Home Hub Inverter Series Critical

AFCI DC Arc Lockout

The inverter's internal Arc-Fault Circuit Interrupter (AFCI) detected high-frequency electrical noise characteristic of a series or parallel DC arc fault. Per UL 1699B safety standards, the inverter ceased power generation and engaged a permanent software lockout until manually inspected and cleared.

⏱ 45-90 Mins Troubleshoot →

CODE 18x87 Home Hub Inverter High

DC Isolation Resistance Low

The inverter detected an insulation breakdown between the active DC conductors (PV array or battery circuit) and Protective Earth (PE). Measured isolation resistance fell below the mandatory threshold (typically < 600 kΩ for single-phase or < 1 MΩ for three-phase systems), tripping ground-fault protection to prevent electrical shock and arc hazards.

⏱ 30-60 Mins Troubleshoot →

CODE 18x8B Home Wave Single Phase Inverter High

Isolation Fault Low DC Resistance

Error 18x8B indicates the inverter's Residual Current Monitoring Unit (RCMU) detected an insulation resistance between the DC string conductors and Earth ground lower than the threshold (typically <600kΩ to 1MΩ). The inverter automatically disconnects from the grid to prevent leakage currents and electric shock hazards.

⏱ 45-90 Mins Troubleshoot →