What to do if my Goodwe MS displays 'Isolation Failure'?
- DDavid TaylorAug 27, 2025
If your Goodwe Inverter is showing an 'Isolation Failure', here’s what to do: First, turn off the DC switch, then disconnect both the DC and AC connectors. Check the impedance between PV (+) & PV (-) to earth. If the impedance is less than 100K Ohms, inspect the insulation of the PV string wiring to the earth. If the impedance is greater than 100K Ohms, contact your local service office. Also, disconnect the AC connector and measure the impedance between the neutral wire and PE line; if it is greater than 10K Ohms, check the AC wiring.








