78
Table 92—
Comfort
Link
™
Alarm Codes
ALARM
OR
ALERT
NUMBER
DESCRIPTION
ACTION TAKEN
BY CONTROL
RESET
METHOD
PROBABLE CAUSE
T051
Compressor A1 Safety Trip
Add Strike for Circuit A
Automatic
High-pressure switch open. Compressor internal protec-
tion open. Wiring error
T051
Compressor A1 Current Detected After
Turnoff
Turn off all compressors
Automatic Welded contactor
T052
Compressor A2 Safety Trip
Add Strike for Circuit A
Automatic
High pressure switch open. Compressor internal protec-
tion open.
Wiring error.
T052
Compressor A2 Current Detect After
Turnoff
Turn off all compressors
Automatic Welded contactor
T055
Compressor B1 Safety Trip
Add Strike for Circuit B
Automatic
High-pressure switch open. Compressor internal protec-
tion open. Wiring error
T055
Compressor B1 Current Detected After
Turnoff
Turn off all compressors
Automatic Welded contactor
T059
Compressor C1 Safety Trip
Add Strike for Circuit C
Automatic High-pressure switch open. Compressor internal protec-
tion open. Wiring error
Compressor C1 Current Detected After
Turnoff
Turn off all compressors
Automatic Welded contactor
T064
Circuit A Saturated Condensing Temp
Thermistor Failure
Use OAT to control Outdoor
fans
Automatic
Faulty, shorted, or open thermistor caused by wiring error
or loose connection.
T065
Circuit B Saturated Condensing Temp
Thermistor Failure
Use OAT to control Outdoor
fans
Automatic
Faulty, shorted, or open thermistor caused by wiring error
or loose connection.
T073
Outdoor Air Temperature Thermistor
Failure
No cooling with economizer
Automatic
Faulty, shorted, or open thermistor caused by wiring error
or loose connection.
T074
Space Temperature Thermistor Failure
If U.CTL = 3, then no
heating or cooling
Automatic
Faulty, shorted, or open thermistor caused by wiring error
or loose connection.
T075
Supply Air Temperature Thermistor
Failure
No cooling with economizer
and No adaptive compressor
staging
Automatic
Faulty, shorted, or open thermistor caused by wiring error
or loose connection.
T076
Return Air Thermistor Failure
If RAT.S = Yes, then
no return air display
Automatic
Faulty, shorted, or open thermistor caused by wiring error
or loose connection.
T077
Space Relative Humidity Sensor Failure If RH.S = Yes, then no indoor
humidity control
Automatic Faulty sensor or wiring error
T080
Circuit C Saturated Condensing Temp
Thermistor Failure
Use OAT to control Outdoor
fans
Automatic Faulty, shorted, or open thermistor caused by wiring error
or loose connection.
T092
Circuit A Suction Pressure Transducer
Failure
Shutdown Circuit A
Manual
Faulty transducer, faulty 5-V power supply, or loose
connection
T093
Circuit B Suction Pressure Transducer
Failure
Shutdown Circuit B
Manual
Faulty transducer, faulty 5-V power supply, or loose
connection
T101
Circuit C Suction Pressure Transducer
Failure
Shutdown Circuit C
Manual
Faulty transducer, faulty 5-V power supply, or loose
connection
T102
Compressor A1 Current Sensor Failure
If CS.A1 = Enable, then no
T051 current alarm
Automatic
Faulty current sensor caused by wiring error or loose
connection
T102
Compressor A2 Current Sensor Failure
If CS.A2 = Enable, then no
T052 current alarm
Automatic
Faulty current sensor caused by wiring error or loose
connection
T103
Compressor B1 Current Sensor Failure
If CS.B1 = Enable, then no
T055 current alarm
Automatic
Faulty current sensor caused by wiring error or loose
connection
T104
Compressor C1 Current Sensor Failure
If CS.C1 = Enable, then no
T059 current alarm
Automatic Faulty current sensor caused by wiring error or loose
connection
T110
Circuit A Loss of Charge
Shutdown Circuit A
Manual
Low refrigerant or faulty suction pressure transducer
T111
Circuit B Loss of Charge
Shutdown Circuit B
Manual
Low refrigerant or faulty suction pressure transducer
T126
Circuit A High Refrigerant Pressure
Shutdown Circuit A
Automatic
An overcharged system, high outdoor ambient tempera-
ture coupled with dirty outdoor coil, plugged filter drier, or
a faulty high-pressure switch.
T127
Circuit B High Refrigerant Pressure
Shutdown Circuit B
Automatic
An overcharged system, high outdoor ambient tempera-
ture coupled with dirty outdoor coil, plugged filter drier, or
a faulty high-pressure switch.
T133
Circuit A Low Refrigerant Pressure
Add Strike for Circuit A
Automatic
Low refrigerant charge, dirty filters, evaporator fan turn-
ing backwards, loose or broken fan belt, plugged filter
drier, faulty transducer, excessively cold return air, or
stuck open economizer when the ambient temperature is
low.
T134
Circuit B Low Refrigerant Pressure
Add Strike for Circuit B
Automatic
Low refrigerant charge, dirty filters, evaporator fan turn-
ing backwards, loose or broken fan belt, plugged filter
drier, faulty transducer, excessively cold return air, or
stuck open economizer when the ambient temperature is
low.
T140
Circuit C Loss of Charge
Shutdown Circuit C
Manual
Low refrigerant or faulty suction pressure transducer
T141
Circuit C Low Refrigerant Pressure
Add Strike for Circuit C
Automatic Low refrigerant charge, dirty filters, evaporator fan turn-
ing backwards, loose or broken fan belt, plugged filter
drier, faulty transducer, excessively cold return air, or
stuck open economizer when the ambient temperature is
low.
T142
Circuit C High Refrigerant Pressure
Shutdown Circuit C
Automatic An overcharged system, high outdoor ambient tempera-
ture coupled with dirty outdoor coil, plugged filter drier, or
a faulty high-pressure switch.
LEGEND
ECB
--- --- Economizer Control Board
IGC
--- --- Integrated Gas Controller
MBB
--- --- Main Base Board
OAT
--- --- Outdoor---Air Thermistor
48/
50P
G
C
03
--
16