64
ARTC-SVX005B-EN
Chiller/Heater 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
Compressor 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.
Compressor Flash Codes
The technology in the Trane compressor will
communicate an abnormal system condition through a
unique flash code:
A
AL
LE
ER
RT
T L
LE
ED
D ((Y
Ye
ellllo
ow
w)):: 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.
T
TR
RIIP
P//L
LO
OC
CK
K L
LE
ED
D ((R
Re
ed
d)):: indicates either a TRIP or LOCK
condition.
•
T
TR
RIIP
P is indicated by a solid illumination of the LED.
This means the compressor is not running and
demand is present at the module.
•
L
LO
OC
CK
K is indicated by a flashing LED correlating to a
lock condition in which the module will prevent the
compressor from starting.
Flash Code Description
Compressor will report a range of flash codes when
specific critical events occur. See .
C
CO
OD
DE
E 1
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.)
C
CO
OD
DE
E 2
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.
C
CO
OD
DE
E 3
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.
C
CO
OD
DE
E 4
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.
C
CO
OD
DE
E 5
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.
C
CO
OD
DE
E 6
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 winding of the compressor, but no current is
detected in the S winding of the compressor for 2
seconds.
C
CO
OD
DE
E 7
7 – Open Run Circuit: The module will lockout
the compressor and flash red seven times if the module
detects a demand signal in the Y terminal and current
in the S winding of the compressor, but no current is
detected in the R winding of the compressor for 2
seconds.
C
CO
OD
DE
E 8
8 – Welded Contactor: The module will flash
yellow eight times if it has detected line currents in the
S and R windings and demand is absent for 15
seconds.
C
CO
OD
DE
E 9
9 – Low Voltage: The module will flash nine
times if the module supply voltage drops below 17 Vac
for 2 seconds. The module will prevent the compressor
from starting until adequate voltage is established.
C
CO
OD
DE
E 1
10
0 – Over-Current Protection: When the current
at the PROT terminal is greater than 2A for 40
milliseconds, the module will flash a CODE10. The red
LED will flash 10 times with the yellow LED remaining
off. This event will cause a lockout of the compressor
and indicates that the module is mis-wired or the
contactor coil is shorted to ground.
