8 ALARM DESCRIPTIONS AND SOLUTIONS
8.1 Alarm Descriptions
NOTE: Alarms must be acknowledged before they can be reset. To acknowledge or silence an alarm,
press the ALARM key one time. This will silence the alarm; the red LED will remain illuminated until the
alarm is reset.
• CALL SERVICE—Activated when Customer Input 1 is configured for “Call Service” and 24VAC
is applied to the input. This alarm is reset when the 24VAC is removed.
• COMP 1A HIGH PRESSURE—Activated when the control senses a high head pressure signal
from Compressor 1A . This alarm will reset when the main power is cycled or the HP 1A Alarm
Code variable in the Service Diagnostics menu is reset to 0.
• COMP 1B HIGH PRESSURE—Activated when the control senses a high head pressure signal
from Compressor 1B. This alarm will reset when the main power is cycled or the HP 1B Alarm
Code variable in the Service Diagnostics menu is reset to 0.
• COMP 2A HIGH PRESSURE—Activated when the control senses a high head pressure signal
from Compressor 2A. This alarm will reset when the control power is cycled or the HP 2A Alarm
Code variable in the Service Diagnostics menu is reset to 0.
• COMP 2B HIGH PRESSURE—Activated when the control senses a high head pressure signal
from Compressor 2B by the control. This alarm will reset when the main power is cycled or the
HP 2B Alarm Code variable in the Service Diagnostics menu is reset to 0.
• COMP 1A SHORT CYCLE—Activated when Compressor 1A turns On, Off, then back On, 10
times within 1 hour. The alarm will reset itself when the control turns Compressor 1A On, then
Off fewer than 10 times within 1 hour of operating time for 1.5 hours.
• COMP 1B SHORT CYCLE—Activated when Compressor 1B turns On, Off, then back On, 10
times within 1 hour. The alarm will reset itself when the control turns Compressor 1B On, then
Off fewer than 10 times within 1 hour of operating time for 1.5 hours.
• COMP 2A SHORT CYCLE—Activated when Compressor 2A turns On, Off, then back On, five
times within 10 minutes or 10 times within 1 hour. The alarm will reset itself when the control
turns Compressor 2A On, then Off fewer than 10 times within 1 hour of operating time for 1.5
hours.
• COMP 2B SHORT CYCLE—Activated when Compressor 2B turns On, Off, then back On, five
times within 10 minutes or 10 times within 1 hour. The alarm will reset itself when the control
turns Compressor 2B On, then Off fewer than 10 times within 1 hour of operating time for 1.5
hours.
• COMPRESSOR(S) LOCKOUT—Activated when Customer Input 1 is configured for “Comp Lock
PD” and 24VAC is applied to the input. This alarm is reset when the 24VAC is removed.
• CONDENSATION DETECTED (optional)—Activated when water is detected at a cooling
module. A 24VAC signal is applied to the condensation input on the control board using a
twisted pair of wires or the alarm is sent via CANbus communication. When this alarm is active,
the control will raise its refrigerant control point by 4°F (2.2°C). This alarm will reset when the
alarms is acknowledged and the signal stops being sent from CANbus or condensation input.
The alarm can also be reset by cycling the power. The main power must be cycled to remove
the 4°F (2.2°C) offset.
Vertiv | Liebert® XDC™ User Manual | 115
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