Manufacturer Diagnostics Manual
Verified OEM Technical Manual
SMA Solar Diagnostics & Fault Manuals
German manufacturer of Sunny Boy and Sunny Island series inverters.
Equipment Models
Hardware families produced by SMA Solar
Indexed Error Codes for SMA Solar
Machine-verified error code diagnostic walkthroughs
CODE Event 3501
Sunny Tripower Smart Energy
High
Insulation Resistance Fault
The inverter detected an insulation resistance (Riso) fault on the DC side dropping below the safety threshold (typically < 200 kOhm to ground) during pre-grid connection checks or operational residual current monitoring, preventing grid feed-in to avert ground fault and shock hazards.
⏱ 30-60 Mins
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