58 ARTC-SVX002A-EN
Chiller Troubleshooting
General Approach to Fault
Isolation
Trane manufactures chillers with embedded fault
detection and diagnostics in each module’s controller that
offers continuous dedicated monitoring to record and
report faults as they occur in real time allowing repairs to
be performed in a timely manner.
Various faults occurring in a building’s HVAC system can
lead to unnecessary energy consumption and poor
thermal comfort for a building’s occupants. Fault detection
and isolation plays a significant role in monitoring,
maintaining, and repairing chillers to improve operator
safety and minimize operating costs.
Fault detection is recognizing that a problem has occurred,
even if the root cause is not yet known. Fault isolation is the
process of reducing potential causes to determine the
most likely source of chiller failure.
Controller Diagnostic Codes
The following table assists in explaining the alarm codes
that appear in the remote interface panel in the event of an
alarm. The alarm history is accessed by pressing the alarm
log key. See below table.
Table 11. Interface panel diagnostic code key
ALARM RESET ACTION
BMS offline Auto Warning
Compressor 1/2 CoreSense Failure Auto Shuts down compressor 1/2
Compressor 1/2 Failure Auto Shuts down compressor 1/2
Compressor 1/2 Lockout Auto Shuts down Circuit 1/2
Compressor 1/2 Offline Auto Shuts down compressor 1/2
Compressor 1/2 Warning Auto Warning
Condenser Flow Alarm User Shuts down Circuits / Circuit 1 in Constant Flow systems
Condenser LWT too low Auto Warning
c.pCOe Offline Alarm Auto Shuts down Circuit 2
c.pCOe UI1 sensor failure Auto
Shuts down Circuit 2 if Low Pressure sensor selected for Suction Pressure
Alarm
c.pCOe UI2 sensor failure Auto Shuts down Circuit 2
c.pCOe wrong config Alarm Auto Warning
Error in retain memory writings User Warning
Error in the number of retain memory writings User Warning
Evaporator Flow Alarm User Locks out module in Variable Flow systems
Evaporator Freezing Alarm User Locks out module
Evaporator LWT too high Auto Warning
HP Alarm User Shuts down Circuit 1/2
HP Switch Alarm User Shuts down Circuit 1/2
LP Alarm Auto Shuts down Circuit 1/2
LP Lockout Alarm User Shuts down Circuit 1/2
Client communication lost Auto Server modules switch into Stand-alone Mode
Phase Monitor Alarm Auto Locks out module
Server 1/2/3/4/5/6/7/8/9 communication lost Auto Warning
System Chilled LWT too high Auto Warning
System Hot LWT too low Auto Warning
UI1 sensor failure Auto
Shuts down circuit 1 if Low Pressure sensor selected for Suction Pressure
Alarm
UI2 sensor failure Auto Shuts down Circuit 1
UI3 sensor failure Auto
Shuts down local cooling control if Module is in Stand-alone Mode and
respective Entering / Leaving Water sensor selected for Temperature
Control
UI4 sensor failure Auto Locks out module
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