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VFD Fault Code SLF1
If any of your VFD’s display a fault code of SLF1 it means, there has been an interruption in communication on the Modbus network. This can happen occasionally but mainly only happens after a loss of power.
When this happens typically just resetting the VFD’s will clear it out. To reset the VFD turn the disconnect for the related VFD to the off position, then wait for the VFD screen to turn blank (this could take up to a minute) after that, turn the VFD back on and the fault code should be gone.