Table 39 -- Alarm Codes (cont)
PREFIX SUFFIX ALARM ACTION TAKEN RESET
CODE CODE NUMBER ALARM DESCRIPTION BY CONTROL TYPE PROBABLE CAUSE
Pr 15 37 Circuit C Economizer Circuit shut down or Automatic
Pressure Transducer not allowed to start
Co A1 38
B1 39
C1 40
E1 41
E2 42
E3 43
F1 44
Loss of communication with
Compressor Board A
Loss of communication with
Compressor Board B
Loss of communication with
Compressor Board C
Loss of communication with
EXV Board A
Loss of communication with
EXV Board B
Loss of communication with
EXV Board C
Loss of communication with
Fan Board 1
REASON FOR ALARM
Measured voltage is
0 dc
No communication
with CPM board
No communication with
EXV board
Affected
compressor shut
down
Affected
compressor
shut down
Automatic
Automatic
Faulty transducer,
wiring error, failed CPM
board
Wrong CPM address,
wrong unit configura-
tion, wiring error, power
loss, failed
CPM board
Wrong EXV board
address, wrong unit
configuration, wiring
error, power loss,
failed EXV board
No communication with Circuit A/B shut Automatic Wrong board address,
fan board down or not allowed wrong unit configura-
to start (080-120 tion, wiring error, loss
ton), Circuit A shut of power, failed board
down or not allowed
to start
(130-500 ton)
F2 45 Loss of communication with No communication with Circuit B shut down Automatic Wrong board address,
Fan Board 2 fan board or not allowed to wrong unit configura-
start (130-500 ton) tion, wiring error, loss
of power, failed board
F3 46 Loss of communication with No communication with Circuit C shut down Automatic Wrong board address,
Fan Board 3 fan board or not allowed to wrong unit configura-
start (400-500 ton) tion, wiring error, loss
of power, failed board
No communication with None Automatic Configuration error
free cooling board
No communication with
EMM board
01
O2
O3
Loss of communication with
Free Cooling Board 1
Loss of communication with
Free Cooling Board 2
Loss of communication with
Energy Management
NRCP2* Board
Disable or not allow
EMM functions
3 step and 4-20 mA
and space tempera-
ture reset, occu-
pancy override and
ice build)
NoneLoss of communication with
Heat Reclaim Board
Loss of communication with
AUX Board 6
Cooler Freeze Protection
47
48
49 Automatic
AutomaticO4 5O
05 51
01 52
No communication
with Free Cooling Board
Wrong module
address, wrong unit
configuration, wiring
error, power loss to
module, failed module
Configuration error
P Entering or leaving ther- Unit shut down or Automatic, first Faulty thermistor, faulty
mistor sensed a tempera- not allowed to start occurrence in wiring, low water flow,
ture at or below freeze 24 hours; low loop volume, fouled
point manual if cooler, or freeze
multiple alarms conditions
within 24 hours
-- None Automatic Configuration error
Low saturated suction
temperatures detected for
a period of time
EXV>98%,
suction superheat > 30 F,
and SST<MOP for more
than 5 minutes
02 53
03 54
04 55
05 56
06 57
07 58
08 59
09 60
10 61
Condenser Freeze Protection
Circuit A
Condenser Freeze Protection
Circuit B
Condenser Freeze Protection
Circuit C
Circuit A Low Suction
Temperature
Circuit B Low Suction
Temperature
Circuit C Low Suction
Temperature
Circuit A High Suction
Superheat
Circuit B High Suction
Superheat
Circuit C High Suction
Superheat
LEGEND
Automatic, first
occurrence in
24 hours;
manual if
multiple alarms
within 24 hours
Manual
CON -- Carrier Comfort Network®
CPM -- Compressor Protection Module
EMM -- Energy Management Module
EXV -- Electronic Expansion Valve
MOP -- Maximum Operating Pressure
MTA -- Must Trip Amps
OAT -- Outdoor Air Temperature
SST -- Saturated Suction Temperature
UL -- Underwriters' Laboratories
*NRCP2 is the Energy Management Board.
Circuit shut down
Circuit shut down
Faulty thermistor, faulty
wiring, low water flow,
low loop volume, fouled
cooler, or freeze
conditions
Faulty transducer,
faulty wiring, faulty
thermistor, faulty EXV,
low refrigerant charge,
plugged or restricted
liquid line
69
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