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71
Table 49 — Alarm Codes (cont)
LEGEND
PREFIX
CODE
SUFFIX
CODE
ALARM
NUMBER
ALARM DESCRIPTION
REASON FOR ALARM
ACTION TAKEN
BY CONTROL
RESET
TYPE
PROBABLE CAUSE
P
11
77
Circuit A Low Suction
Superheat
EXV<5% and either the
suction superheat is less
than the set point by at
least 5 F or the suction
temperature is greater
than MOP set point for
more than 5 minutes
Circuit shut down
Manual
Faulty transducer,
faulty wiring, faulty
thermistor, faulty EXV,
or incorrect
configuration
12
78
Circuit B Low Suction
Superheat
14
80
Interlock Failure
Lockout Switch Closed
Unit shut down or
not allowed to start
Automatic
Lockout Switch Closed
on EMM board
28
81
Electrical Box Thermostat
Failure/Reverse Rotation
External pump interlock
open
Unit shut down or
not allowed to start
Automatic
External pump off.
Faulty jumper wiring
when channel not used
29
82
Loss of communication with
System Manager
Loss of communication
with an external control
device for more than
2 minutes
Unit change to
stand-alone
operation
Automatic
Faulty communication
wiring, no power
supply to the external
controller
30
83
Master/Slave communication
Failure
Communication between
the master and slave
machines lost
Unit change to
stand-alone
operation
Automatic
Faulty communication
wiring, no power or
control power to the
main base board of
either module
67
84
Circuit A Low Oil Pressure
Oil pressure and suction
pressure differential is
less than the set point
Circuit shut down
Automatic, first
occurrence in
24 hours;
manual if
multiple alarms
within 24 hours
Plugged oil filter, faulty
oil transducer, oil check
valve stuck, plugged oil
strainer
68
85
Circuit B Low Oil Pressure
70
87
Circuit A Max Oil Filter Differ-
ential Pressure
Difference between dis-
charge pressure and oil
pressure is greater than
50 psi for more than
30 seconds
Circuit shut down
Manual
Plugged oil filter,
closed oil valve, bad oil
solenoid, oil check
valve stuck, faulty oil
pressure transducer
71
88
Circuit B Max Oil Filter Differ-
ential Pressure
84
90
Circuit A High Oil Filter Drop
Pressure
Difference between dis-
charge pressure and oil
pressure is greater than
30 psi for more than
5 minutes
Alert generated
Manual
Plugged oil filter
85
91
Circuit B High Oil Filter Drop
Pressure
75
93
Circuit A Low Oil Level
Oil level switch open
Circuit shut down or
not allowed to start
Automatic, first
occurrence in
24 hours;
manual if
multiple alarms
within 24 hours
Low oil level, faulty
switch, wiring error,
failed CPM board, oil
solenoid stuck open
76
94
Circuit B Low Oil Level
MC
nn
96
Master chiller configuration
error Number 01 to nn
Wrong or incompatible
configuration data
Unit not allowed to
start in Master-slave
control
Automatic
Configuration error
FC
n0
97
No factory configuration
No Configuration
Unit not allowed to
start
Automatic
Configuration error
nn
98
Illegal factory configuration
Number 01 to 04
Wrong or incompatible
configuration data
Unit not allowed to
start
Automatic
Configuration error
P
31
99
Unit is in CCN emergency
stop
Emergency stop com-
mand has been received
Unit shut down or
not allowed to start
Automatic
Carrier Comfort
Network
®
Emergency
Stop command
received
32
100
Cooler pump #1 fault
Pump interlock status
does not match pump
status
Unit shuts down, if
available, another
pump will start
Manual
Faulty contacts, wiring
error or low control
voltage. Configuration
error.
33
101
Cooler pump #2 fault
15
102
Condenser Flow Switch
Failure
—
None
Manual
Configuration error,
faulty wiring or external
pump off
34
103
Circuit A Reclaim Operation
Failure
—
None
Manual
Configuration error
35
104
Circuit B Reclaim Operation
Failure
37
105
Circuit A — High condensing
temperature out of compres-
sor envelope
Multiple capacity over-
rides due to high
saturated discharge
temperature
Circuit shut down
Automatic
Low or restricted
condenser water flow.
Fouled condenser
tubes.
38
106
Circuit B — High condensing
temperature out of compres-
sor envelope
CCN
—
Carrier Comfort Network
®
MLV
—
Minimum Load Valve
CPM
—
Compressor Protection Module
MOP —
Maximum Operating Pressure
EMM
—
Energy Management Module
MTA
—
Must Trip Amps
EWT
—
Entering Water Temperature
SST
—
Saturated Suction Temperature
EXV
—
Electronic Expansion Valve
UL
—
Underwriters Laboratories
HPS
—
High Pressure Switch