American Power Conversion DX Displayed Alarm Message, Action Required, Comm Lost state, or Off

Displayed Alarm Message	Action Required
MultiCool Coil No Coolant	• Verify the flow from the chilled water supply.
Flow	• Check the operation of the flow switch.
	• Check the electrical connections to the flow switch.
	• Verify that the chilled water supply isolation valve is open.
No Backup Systems Available	• Check the number of Systems designated for the backup role.
	• Check that the primary or backup Systems are not in a failed state, in the
	Comm Lost state, or Off.
Primary Sensors Failed	• Verify that there is a proper CAN connection between the sensors and the
	user interface box.
	• Check the connections of the 25-pin serial communication cable from the
	main controller board to the customer interface box.
	• Replace the sensor assembly.
Remote Sensor Removed	• Check the CAN bus connection to the remote sensor.
	• Disregard this alarm if you removed the remote sensor.
Remote Sensor Added	• Check the CAN bus connection to the remote sensor.
	• Disregard this alarm if you added the remote sensor.
Replace Steam Cylinder	• Replace the steam cylinder.
Return Sensor Fail	• Verify that there is a proper CAN connection between the sensors and the
	user interface box.
	• Replace the sensor assembly.
Secondary Sensors Failed	• Verify that there is a proper CAN connection between the remote sensors and
	the user interface box.
	• Check the remote sensor dip switch settings for proper address configuration.
	• Check the connections of the 25 pin serial communication cable from the
	main controller board to the customer interface box.
	• Replace the sensor assembly.
Smoke Detected	• Confirm that the wiring connections to the wiring harness are secure.
	• Ensure the smoke head and sub-base are properly attached.
	• Ensure that there is not dirt or dust on the smoke head. Use pressurized air to
	clean the smoke head chamber.
	• Replace the smoke detector.
Suction Pressure Low	• Confirm (at the display interface) that the pressure drop across the evaporator
	coil is within the acceptable range (Path: Main Menu > Status > [Main or
	Expansion] Module > Pressures).
	• Confirm that the cooling setpoint is not below 20°C (68°F).
	• Verify the condition of the return filters. Check (at the display interface) the
	pressure drop across the filters (Path: Main Menu > Setup > System >
	System Config > System Options).
	• Confirm that the outdoor heat exchanger is operating properly and that its
	setpoints are correct.
	• Confirm proper refrigerant charge in the Module.
	• Confirm proper Module setup and that the correct Module size is indicated
	on the display interface.
	• Verify that the evaporator coil is clean and free of debris.

58 NetworkAIR FM DX 60 Hz Operation, Maintenance, and Troubleshooting