American Power Conversion Central Air Conditioning System Benutzerhandbuch

Humidifier Cylinder Depleted

• Replace the disposable cylinder.
• Clean the reusable humidifier cylinder (optional).

Humidifier Cylinder Full when 
Off

• Check the humidifier drain valve for clogging.
• Check the operation of the humidifier drain solenoid.

Humidifier Drain Malfunction

• Ensure that the drain is free of any debris.
• Verify the operation of the drain solenoid valve.

Humidifier Excessive Foam

• Verify that the humidifier water supply is not using conditioned water and 

that the water does not contain contaminates.

• Check the humidifier water supply hose for dirt and contaminates.
• Check the steam supply hose for kinks that may cause back-pressure.

Humidifier Excessive Output 
Reduction

• Reduce the humidifier sensitivity setting on the display interface (Path: 

Main > Setup > System # > System Config > Humid. Sensitivity) if 
necessary.

Humidifier Fault Tolerance 
Exceeded

• The humidifier has experienced three faults within one-half hour.
• Reset the humidifier from the display interface (Path: Main > Setup > 

Module > [Module in which the alarm occurred] > Module Control > 
Reset Humidifier).

Humidifier Internal Memory 
Error

• Check the controller connections to the humidifier for electrical discharge.

Humidifier No Power

• Verify that the circuit breaker for the humidifier has not been tripped.
• Confirm that the line voltage connections to the cylinder are secure and 

correct.

Humidifier Requires 
Maintenance

• Verify the operation of the humidifier and perform preventive maintenance.
• Reset the maintenance alarm on the display interface for the humidifier.

Humidifier Water Conductivity 
High

• Verify that the proper voltage is being applied to the humidifier cylinder.
• Confirm that the line voltage connections to the cylinder are secure and 

correct.

• Ensure that the water supply to the humidifier has not been conditioned. 

Conditioned water can increase water conductivity.

Humidifier Water Level Low

• Verify that the humidifier water supply is open and flowing to the humidifier 

water connection.

• Confirm that the inlet water strainer on the humidifier fill solenoid is clear 

and free of debris.

• Ensure that the water pressure is at least at 30 psig (206 kPa).
• Verify the operation of the fill solenoid valve.

Module Powered Up

• The Module has successfully started.

No Backup Systems Available

• Check the number of Systems designated for the backup role. 
• Check that the backup Systems are not failed, in the Comm Lost state, or Off.

Primary Sensors Failed

• Verify that there is a proper CAN connection between sensors and the user 

interface box.

• Replace the sensor assembly.

Remote Sensor Removed

• Check the CAN bus connection to the remote sensors.
• Disregard if you removed the remote sensor.