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What would cause an ATS48 to trip and display InF (Internal Fault)?
INF is an internal fault, Try disconnecting the control voltage CL1 CL2 to see if the fault will reset.
You can also check the ribbon cables under the main control board to the power board.
Check the SCRs
Check 24V to COM with Control wires removed.
Check J6 pins 5 and 6 of the Power board..