Carrier /50HC 04-28 - Page 37

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Table 9 – ComfortLink 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 protection
open. Wiring error
Service Test --- Compressor A1 Safety Trip
Compressor A1 Detected After Turnoff
Turn off all compressors Automatic Welded contactor
Service Test --- Compressor A1 Detected After
Turno f f
T055
Compressor B1 Safety Trip
Add Strike for Circuit B Automatic
High--- pressure switch open. Compressor internal protection
open. Wiring error
Service Test --- Compressor B1 Safety Trip
Compressor B1 Detect After Turnoff Turn off all compressors Automatic
Welded contactor
Service Test --- Compressor B1 Detected After
Turno f f
T064
Circuit A Saturated Condensing Temp Thermistor
Failure
Limited Diagnostic Automatic
Faulty, shorted, or open thermistor caused by wiring error or
loose connection.
T065
Circuit B Saturated Condensing Temp Thermistor
Failure
Limited Diagnostic Automatic
Faulty, shorted, or open thermistor caused by wiring error or
loose connection.
T066
Circuit A Saturated Suction Temperature
Thermistor Failure
No Circuit A Cooling Automatic Circuit A Suction transducer internally forced inactive
T067
Circuit B Saturated Suction Temperature
Thermistor Failure
No Circuit B Cooling Automatic Circuit B Suction transducer internally forced inactive
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
differential Dry Bulb control
Automatic
Faulty, shorted, or open thermistor caused by wiring error or
loose connection.
T077 Space Relative Humidity Sensor Failure
If RH.S = Y es, then no
indoor humidity control
Automatic
Faulty,shorted,oropensensorcausedbywiringerrororloose
connection.
T092 Circuit A Suction Pressure Transducer Failure Lockout Circuit A Manual
Faulty transducer, faulty 5--- V power supply, or loose
connection
T093 Circuit B Suction Pressure Transducer Failure Lockout Circuit B 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 transducer, faulty 5--- V power supply, or loose
connection
T103 Compressor A1 Current Sensor Failure
If CS.B1 = Enable, then no
T055 current alarm
Automatic
Faulty transducer, faulty 5--- V power supply, or loose
connection
T110
Circuit A Loss of Charge
Lockout Circuit A Manual Low refrigerant or faulty suction pressure transducer
Service Test --- Circuit A Loss of Charge
T111
Circuit B Loss of Charge
Lockout Circuit B Ma nual Low refrigerant or faulty suction pressure transducer
Service Test --- Circuit B Loss of Charge
T126
Circuit A High Discharge 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.
Service Test --- Circuit A High Discharge Pressure
T127
Circuit B High Discharge 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.
Service Test --- Circuit B High Discharge Pressure
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, excessively cold return air , or stuck open
economizer when the ambient temperature i s low.
Service Test --- Circuit A Low Refrigerant Pressure
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, excessively cold return air , or stuck open
economizer when the ambient temperature i s low.
Service Test --- Circuit B Low Refrigerant Pressure
T143
Circuit A Failure To Pressurize
Add Strike for Circuit A Automatic Wiring causing reverse rotation or faulty compressor
Service Test --- Circuit A Failure to Pressurize
T144
Circuit B Failure To Pressurize
Add Strike for Circuit B Automatic Wiring causing reverse rotation or faulty compressor
Service Test --- Circuit B Failure to Pressurize
T153 Real Timeclock Hardware Failure
No time and date schedule
operation
Automatic No time/date configured, software failure, or MBB failure
LEGEND
ECB --- Economizer Control Board
IGC --- Integrated Gas Controller
MBB --- Main Base Board
OAT --- O u t d o o r --- Ai r T h e r m i s t o r
ComfortLINK v1.X