There are two signs that you have this issue.
Solar king inverter relay failure.
Couple of hours labour should do it.
The screen is showing relay failure.
A solar king solar inverter relay failure message occurs when an internal relay inside the inverter fails to operate correctly.
Assuming the inverter is accurate in diagnosis then ideally a relay replacement would be the simplest cheapest solution.
Error code 120 when a growatt solar inverter displays the error code 120 it means that there is a problem with the current sensor.
This fault can pertain to water ingress or panel related earth faults.
Wait for approximately 1 minute.
Contact solargain for a solar maintenance service.
Turn off the pv array dc isolator located at the inverter.
Turn on the solar supply main switch and the ac isolator if installed.
The fault light is on.
Turn off the solar supply main switch or inverter ac isolator if installed.
If this is a permanent fault the inverter requires replacement.
We recommend a health check to eliminate an external cause for this fault prior to purchasing a new inverter.
Try to restart the inverter and if the problem persists you should already contact your solar inverter installer.
Is your solar king solar inverter showing a relay failure message on the screen.
Additionally you may hear a clicking from the inverter as the relays inside the unit trying to pull in.
An error code 117 on a growatt solar inverter means that there is a problem in the relay circuit.