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Table 49 — Alarm Codes (cont)
LEGEND
DIAGNOSTIC ALARM CODES AND POSSIBLE
CAUSES
Thermistor Failure
Alarm 1 — Cooler Fluid Entering (th.01)
Alarm 2 — Cooler Fluid Leaving (th.02)
Criteria for Trip — This alarm criterion is tested whether the
unit is on or off if the temperature as measured by the thermis-
tor is outside of the range –40 to 245 F (–40 to 118.3 C).
Action to be Taken — The unit shuts down normally, or is not
allowed to start.
Reset Method — Automatic, the alarm will reset once the
thermistor reading is within the expected range.
Possible Causes — If this condition is encountered, check the
following items:
• sensor wiring to the Main Base Board
• sensor accuracy
See the Thermistors section on page 56 for thermistor de-
scription, identifiers and connections.
Defrost Thermistor Failure
Alarm 3 — Circuit A (th.03)
Alarm 4 — Circuit B (th.04)
NOTE: Alarms 3 and 4 are not used or supported. If this condi-
tion is encountered, confirm machine configuration.
Thermistor Failure
Alarm 5 — Condenser Entering Fluid (th.06)
Alarm 6 — Condenser Leaving Fluid (th.07)
NOTE: Alarms 5 and 6 are not used or supported. If this condi-
tion is encountered, confirm machine configuration.
Condenser Reclaim Thermistor
Alarm 7— Reclaim Entering Fluid (th.08)
Alarm 8 — Reclaim Leaving Fluid (th.09)
NOTE: Alarms 7 and 8 are not used or supported. If this condi-
tion is encountered, confirm machine configuration.
PREFIX
CODE
SUFFIX
CODE
ALARM
NUMBER
ALARM DESCRIPTION REASON FOR ALARM
ACTION TAKEN
BY CONTROL
RESET
TYPE
PROBABLE CAUSE
A1, B1 10 132-10,
133-10
Compressor Y delta starter
current increase failure alarm
If the delta mode current
is not 25% greater than
the current in Y mode
Circuit shut down Manual Power supply to delta
contactor not
connected, faulty delta
contactor or wiring,
faulty CPM board
11 132-11,
133-11
Compressor Contactor failure CPM board detects
greater than 15% of MTA
current for 10 seconds
after shutting off the com-
pressor contactor. Oil
solenoid is energized.
Circuit shut down Manual Faulty contactor, con-
tactor welded, wiring
error
12 132-12,
133-12
Compressor Unable to stop
motor
CPM board detects
greater than 15% of MTA
current for 10 seconds
after three attempts
Circuit shut down Manual Faulty contactor,
contactor welded,
wiring error
13 132-13,
133-13
Compressor Phase reversal CPM board detects phase
reversal from current
toroid
Circuit shut down Manual Terminal block power
supply lead not in
correct phase. Power
supply leads going
through toroid crossed
14 132-14,
133-14
Compressor MTA configura-
tion fault
MTA setting is out of the
allowed MTA range
Circuit shut down Manual Incorrect MTA setting,
faulty CPM board
15 132-15,
133-15
Compressor Configuration
switch mismatch
CPM board MTA setting
do not match factory
configuration
Circuit shut down Manual Incorrect CPM dip-
switch setting,
incorrect factory MTA
setting, faulty CPM
board
16 132-16,
133-16
Compressor Unexpected
switch setting change
CPM board dipswitch S1
setting changed
Circuit shut down Manual Incorrect CPM dip-
switch setting, faulty
CPM board
17 132-17,
133-17
Compressor Power on reset CPM board detects a
power failure
Circuit shut down Manual Power supply
interruption
18 132-18,
133-18
Compressor UL 1998 critical
section software error
Software error Circuit shut down Manual Electric noise, faulty
CPM board
19 132-19,
133-19
Compressor UL 1998 current
measure dual channel
mismatch
Software error Circuit shut down Manual Electric noise, faulty
CPM board
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