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How do I fix an F61 Internal Control Supply Fault code for a DG1 drive?

The internal control supply fault is an indication that the control board internal 24VDC supply is outside the range of 18-27VDC. When this fault occurs with a meter measure the 24VDC output coming from the control board, if the voltage reads okay perform a power cycle to see if fault clears. If fault is not able to clear replace the control board.