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Table 38 — Alarm and Alert Codes
ALARM/
ALERT
CODE
ALARM
OR
ALERT
DESCRIPTION
WHY WAS THIS
ALARM
GENERATED?
ACTION TAKEN
BY CONTROL
RESET
METHOD
PROBABLE
CAUSE
A048 Alarm
Circuit A Compressor
Availability Alarm
Two compressors on circuit
failed
Circuit shut down Manual
Only one compressor
operating.
T051 Alert
Circuit A, Compressor 1
Failure
Compressor feedback signal
does not match relay state
Compressor A1 shut
down.
Manual
High-pressure switch open,
faulty CSB, loss of condenser
flow, filter drier plugged, non-
condensables, operation
beyond capability.
A051 Alarm
Circuit A, Compressor 1
Failure
Respective current sensor
board (CSB) feedback signal
is ON when the compressor
should be off
Unit shut down Manual
High-pressure switch open,
faulty CSB, loss of condenser
flow, filter drier plugged, non-
condensables, operation
beyond capability.
T052 Alert
Circuit A, Compressor 2
Failure
Compressor feedback signal
does not match relay state
Compressor A2 shut
down.
Manual
High-pressure switch open,
faulty CSB, loss of condenser
flow, filter drier plugged, non-
condensables, operation
beyond capability.
A052 Alarm
Circuit A, Compressor 2
Failure
Respective current sensor
board (CSB) feedback signal
is ON when the compressor
should be off
Unit shut down Manual
High-pressure switch open,
faulty CSB, loss of condenser
flow, filter drier plugged, non-
condensables, operation
beyond capability.
T053 Alert
Circuit A, Compressor 3
Failure
Compressor feedback signal
does not match relay state
Compressor A3 shut
down.
Manual
High-pressure switch open,
faulty CSB, loss of condenser
flow, filter drier plugged, non-
condensables, operation
beyond capability.
A053 Alarm
Circuit A, Compressor 3
Failure
Respective current sensor
board (CSB) feedback signal
is ON when the compressor
should be off
Unit shut down Manual
High-pressure switch open,
faulty CSB, loss of condenser
flow, filter drier plugged, non-
condensables, operation
beyond capability.
A060
Alarm
Cooler Leaving Fluid
Thermistor Failure
Thermistor outside range of
–40 to 245 F (–40 to 118 C)
Chiller shut down
immediately
Automatic
Thermistor failure, damaged
cable/wire or wiring error.
A061 Alarm
Cooler Entering Fluid
Thermistor Failure
Thermistor outside range of
–40 to 245 F (–40 to 118 C)
Chiller shut down
immediately
Automatic
Thermistor failure, damaged
cable/wire or wiring error.
T062 Alert Condenser Leaving Fluid
Thermistor Failure
Thermistor outside range of
–40 to 245 F (–40 to 118 C)
Alert only.
No action taken.
Automatic Thermistor failure, damaged
cable/wire or wiring error.
T063 Alert Condenser Entering Fluid
Thermistor Failure
Thermistor outside range of
–40 to 245 F (–40 to 118 C)
Alert only.
No action taken.
Automatic Thermistor failure, damaged
cable/wire or wiring error.
T068 None
Circuit A Return Gas
Thermistor Failure
If return gas sensors are
enabled (RG.EN) and
thermistor is outside range of
–40 to 245 F (–40 to 118 C)
Circuit A shut down Automatic
Thermistor failure, damaged
cable/wire or wiring error.
T073 Alert
Outside Air Thermistor
Failure
Thermistor outside range of
–40 to 245 F (–40 to 118 C)
(if enabled)
Temperature reset
disabled. Chiller runs
under normal control/set
points.
Automatic
Thermistor failure, damaged
cable/wire or wiring error.
T074 Alert
Space Temperature/Dual Chiller
Thermistor Failure
Thermistor outside range of
–40 to 245 F (–40 to 118 C)
(if enabled)
Temperature reset
disabled. Chiller runs
under normal control/set
points.
Automatic
Thermistor failure, damaged
cable/wire or wiring error.
A077 Alarm
Circuit A Saturated
Suction Temperature
exceeds Cooler Leaving
Fluid Temperature
Faulty expansion valve,
suction pressure transducer
or leaving fluid thermistor.
Circuit A shutdown after
pumpdown complete.
Manual
Faulty expansion valve or
suction pressure transducer
or leaving fluid thermistor.
T079 Alert
Lead/Lag LWT
Thermistor Failure
Thermistor outside range of
–40 to 245 F (–40 to 118 C)
Chiller runs as a stand
alone machine
Automatic
Dual LWT thermistor failure,
damaged cable/wire or
wiring error.
A090 Alarm
Circuit A Discharge
Pressure Transducer Failure
Outside of range (0 - 667 psig) Circuit A shut down Automatic
Transducer failure, poor
connection to MBB, or wiring
damage/error.
A092 Alarm
Circuit A Suction
Pressure Transducer Failure
Outside of range (0 - 420 psig) Circuit A shut down Automatic
Transducer failure, poor
connection to MBB, or wiring
damage/error.
T094 Alert
Discharge Gas
Thermistor Failure
Discharge thermistor (DTT) is
either open or shorted
Digital compressor shut
down.
Automatic
Thermistor failure, damaged
cable/wire or wiring error.
A110 Alarm Circuit A Loss of Charge
If the compressors are off
and discharge pressure
reading is < 26 psig for
30 sec.
Circuit not allowed to
start.
Manual
Refrigerant leak or
transducer failure
A112 Alarm
Circuit A High Saturated
Suction Temperature
Circuit saturated suction
temperature pressure
transducer > 70 F (21.1 C)
for 5 minutes
Circuit shut down Manual
Faulty Expansion valve,
faulty suction pressure
transducer or high entering
fluid temperature.
A114 Alarm
Circuit A Low Suction
Superheat
Suction superheat is
less than 5° F (2.8 C) for 5
minutes. (if RGT installed)
Circuit A shut down.
Automatic restart
after first daily
occurrence.
Manual restart
thereafter.
Faulty expansion valve,
faulty suction pressure
transducer, faulty suction gas
thermistor, circuit
overcharged