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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 40 108 Circuit A — Repeated low
suction temp overrides
Multiple capacity
overrides due to low satu-
rated suction temperature
Circuit shut down Automatic Inaccurate
transducer, faulty EXV,
low refrigerant charge,
plugged or restricted
liquid line filter drier.
41 109 Circuit B — Repeated low
suction temp overrides
43 111 Low entering water tempera-
ture in heating
Not supported — — —
73 112 Condenser pump #1 default — None Manual Faulty contacts, wiring
error or low control
voltage. Configuration
error.
74 113 Condenser pump #2 default
78 114 Circuit A High Discharge
Temperature
Discharge gas tempera-
ture is higher than 212 F
for more than 90 seconds
Circuit shut down Manual Faulty transducer/high
pressure switch, low/
restricted condenser
flow
79 115 Circuit B High Discharge
Temperature
81 117 Circuit A Low Economizer
Pressure
The economizer pressure
is below the suction pres-
sure more than 14.5 psi
for more than 10 seconds
Circuit shut down Manual Faulty transducer,
faulty main base board,
faulty wiring, closed
suction service valve,
faulty EXV
82 118 Circuit B Low Economizer
Pressure
87 120 Circuit A Slide Valve Control
Unverifiable
If 100% load current is
less than 1.1 times of
30% load current, or for
1 minute when active
cooling setpoint is
greater than 32 F.
None Manual Slide valve stuck, inac-
curate initial current
reading
88 121 Circuit B Slide Valve Control
Unverifiable
90 123 Cooler flow switch set point
configuration failure
— None Manual Configuration error
91 124 Cooler flow switch failure Flow switch open Unit shut down Manual if unit
is running,
automatic
otherwise
Faulty flow switch, low
cooler flow, faulty
wiring, faulty cooler
pump, faulty main base
board
Sr nn 128 Service maintenance alert
Number # nn
Field programmed
elapsed time has expired
for maintenance time
None Manual Maintenance required
A1, B1 01 132-01,
133-01
Compressor Motor tempera-
ture too high
Compressor temperature
higher than 232 F for
more than 90 seconds
Circuit shut down Manual Economizer EXV fail-
ure (350,400 only),
faulty CPM board,
low refrigerant charge
02 132-02,
133-02
Compressor Motor tempera-
ture out of range
Compressor temperature
reading out of the range of
–40 F to 245 F
Circuit shut down Manual Faulty thermistor, faulty
wiring, faulty CPM
board
03 132-03,
133-03
Compressor High pressure
switch protection
HPS input on CPM board
open
Circuit shut down Manual, press
reset button on
HPS
Loss of condenser air
flow, operation beyond
compressor envelope,
faulty high pressure
switch, faulty wiring,
faulty CPM board
04 132-04,
133-04
Compressor Over current CPM board detects high
motor current compared
with MTA setting
Circuit shut down Manual Operating beyond
compressor envelope,
incorrect configuration
05 132-05,
133-05
Compressor Locked rotor CPM board detects locked
rotor current compared
with MTA setting
Circuit shut down Manual Compressor motor fail-
ure, unloader slide
valve failure, compres-
sor mechanical failure
06 132-06,
133-06
Compressor Phase loss L1 CPM board detects cur-
rent unbalance greater
than 65% for more than
1 second
Circuit shut down Manual Blown fuse, wiring
error, loose terminals
07 132-07,
133-07
Compressor Phase loss L2
08 132-08,
133-08
Compressor Phase loss L3
09 132-09,
133-09
Compressor Low current
alarm
CPM detects motor cur-
rent less than a certain
percentage of the MTA
setting, compressor not
operating
Circuit shut down Manual Power supply discon-
nected, blown fuse,
wiring error, contact
deenergized, faulty
current toroid high
pressure switch trip.
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