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Table 43 — ComfortLink™ Alarm Codes
LEGEND
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 protection open. Wiring
error
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 protection open.
Wiring error.
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 protection open. Wiring
error
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 protection 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
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 temperature 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 temperature 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 turning backwards,
loose or broken fan belt, plugged filter drier, faulty transducer, exces-
sively cold return air, or stuck open economizer when the ambient tem-
perature is low.
T134 Circuit B Low Refrigerant Pressure Add Strike for Circuit B Automatic
Low refrigerant charge, dirty filters, evaporator fan turning backwards,
loose or broken fan belt, plugged filter drier, faulty transducer, exces-
sively cold return air, or stuck open economizer when the ambient tem-
perature 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 turning backwards,
loose or broken fan belt, plugged filter drier, faulty transducer, exces-
sively cold return air, or stuck open economizer when the ambient tem-
perature is low.
T142 Circuit C High Refrigerant Pressure Shutdown Circuit C Automatic An overcharged system, high outdoor ambient temperature coupled with
dirty outdoor coil, plugged filter drier, or a faulty high-pressure switch.
T143 Circuit A Failure To Pressurize Add Strike for Circuit A Automatic Wiring causing reverse rotation or faulty compressor
T144 Circuit B Failure To Pressurize Add Strike for Circuit B Automatic Wiring causing reverse rotation or faulty compressor
T145 Circuit C Failure To Pressurize Add Strike for Circuit C Automatic Wiring causing reverse rotation or faulty compressor
T153 Real Timeclock Hardware Failure
No time and date
schedule operation
Automatic No time/date configured, software failure, or MBB failure
A154 Serial EEPROM Hardware Failure Unit Shutdown Automatic Software failure or MBB failure
T155 Serial EEPROM Storage Failure Error Unit operation errors Automatic Software failure or MBB failure
A156 Critical Serial EEPROM Storage Fail Error Unit Shutdown Automatic Software failure or MBB failure
A157 A/D Hardware Failure Unit Shutdown Automatic Software failure or MBB failure
A163 Circuit A Down Due to Failure Shutdown Circuit A Manual Circuit has 3 strikes or has been locked out by another alarm
A164 Circuit B Down Due to Failure Shutdown Circuit B Manual Circuit has 3 strikes or has been locked out by another alarm
A165 Circuit C Down Due to Failure Shutdown Circuit C Manual Circuit has 3 strikes or has been locked out by another alarm
T179
Loss of communication with the Economizer
Control Board
No economizer operation Automatic Communication wiring problem with ECB or faulty MBB or ECB
T180
Loss of communication with the Economizer
Actuator
No economizer operation Automatic Communication wiring problem with actuator.
A404 Fire Shutdown Unit Shutdown Automatic Smoke detected by smoke detector
T408 Dirty Filter — Automatic Dirty Filter
T409
Fan Status Switch ON, Contactor OFF
If IDF.F = Yes,
then Unit Shutdown
If IDF.F = YES,
then Manual,
otherwise
automatic
Bad Fan Status Switch.
Configuration incorrect.
Fan Status Switch OFF, Contactor ON
If IDF.F = Yes,
then Unit Shutdown
If IDF.F = YES,
then Manual,
otherwise
automatic
Tripped Circuit Breaker.
Broken belt.
Bad indoor fan motor.
Configuration incorrect. Bad fan status switch.
ECB — Economizer Control Board MBB — Main Base Board
IGC — Integrated Gas Controller OAT — Outdoor-Air Thermistor
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