Chiller Troubleshooting
ARTC-SVX002A-EN 59
Compressor Diagnostic Codes
Copeland compressors used in Trane chillers are highly
automated with digital capability to record and report a
range of operating parameters and critical events. This
technology can be employed to assist in troubleshooting
compressor faults and potential corrective action.
CoreSense Flash Codes
The CoreSense technology in the Copeland compressor
will communicate an abnormal system condition through
a unique flash code:
ALERT LED (Yellow): The ALERT LED will flash a number of
times consecutively, pause and then repeat the process.
The number of consecutive flashes, defined as the flash
code, correlates to a specific anomaly or abnormal
condition.
TRIP/LOCK LED (Red): indicates either a TRIP or LOCK
condition.
• TRIP is indicated by a solid illumination of the LED.
This means the compressor is not running and
demand is present at the module.
• LOCK is indicated by a flashing LED correlating to a
lock condition in which the module will prevent the
compressor from starting.
CoreSense Flash Code Description
Copeland compressors will report a range of flash codes
when specific critical events occur. See Table 12, p. 60.
CODE 1 – Long Run Time: The module will flash yellow one
time when the compressor operates for longer than 18
continuous hours. This is an alert code only and the
module will not lockout the compressor for this condition.
(This code is inactive for heat pumps.)
CODE 2 – Compressor (Pressure) Trips: The module will
flash yellow two times when the compressor operates
from 12 seconds to 15 minutes followed by a trip condition
lasting longer than 7 minutes. When four consecutive or
ten total CODE 2 events are recorded, the module will
lockout the compressor and flash red two times.
CODE 3 – Pressure Switch Cycling: The module will flash
yellow three times when the compressor operates from 12
seconds to 15 minutes followed by a trip condition lasting
between 35 seconds to 7 minutes. When four consecutive
or ten total CODE 3 events are recorded, the module will
lockout the compressor and flash red three times.
CODE 4 – Locked Rotor Trip: The module will flash yellow
four times when the compressor trips within 12 seconds of
operation and does not reset and start within 35 seconds.
When ten consecutive CODE 4 events are recorded the
module will lockout the compressor and flash red four
times.
CODE 5 – Compressor (Moderate Run) Trip: The module
will flash yellow five times when the compressor has
operated between 15 minutes and 18 hours, followed by a
compressor trip lasting longer than 7 minutes. When four
consecutive or ten total CODE 5 events are recorded, the
module will lockout the compressor and flash red five
times.
CODE 6 – Open Start Circuit: The module will lockout the
compressor and flash red six times if the module detects
a demand signal in the Y terminal and current in the S
UI5 sensor failure Auto
Shuts down local heating control if Module is in Stand-alone Mode and
respective Entering / Leaving Water sensor selected for Temperature
Control
UI6 sensor failure Auto
Shuts down Free Cooling control if Module is in Stand-alone Mode and
respective Entering / Leaving Water sensor selected for Temperature
Control
UI7 sensor failure Auto
Modules switch into Stand-alone Mode if both respective Cooling / Heating
Mode selected and respective Entering / Leaving Water sensor selected for
Temperature Control
UI8 sensor failure Auto
Modules switch into Stand-alone Mode if both respective Cooling / Heating
Mode selected and respective Entering / Leaving Water sensor selected for
Temperature Control
UI9 sensor failure Auto
Modules switch into Stand-alone Mode if both respective Cooling / Heating
Mode selected and respective Entering / Leaving Water sensor selected for
Temperature Control
UI10 sensor failure Auto
Modules switch into Stand-alone Mode if both respective Cooling / Heating
Mode selected and respective Entering / Leaving Water sensor selected for
Temperature Control
UI11 sensor failure Auto Control panel heating / cooling control is disabled
UI12 sensor failure Auto Warning
Wrong local rotation control parameters Auto Warning
Wrong Client rotation control parameters Auto Warning
Wrong temperature control parameters Auto Warning
Table 11. Interface panel diagnostic code key (continued)
ALARM RESET ACTION
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