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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