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Q : What causes an UL under-voltage fault on GD350 after the motor is connected?
A: If it operates normally without the motor, an under-voltage fault with the motor connected usually indicates the relay is not functioning. Power on and listen for the relay clicking into place. The relay operates on internal 24V power. If no sound is heard, disconnect the fan power cable at the top, then power on again and check for the relay clicking sound. If still absent, this indicates no internal 24V power. Replace the relay or the internal power board.
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