Carrier 50PD05 Operating And Service Instructions page 29

Table
8 -- ComfortLink T_,Alarm Codes
ALARM
OR
ALERT
NUMBER
T051
T064
T066
T073
T074
T075
T076
T077
T092
T102
Tl10
T126
T133
T143
T153
A154
T155
A156
A157
DESCRIPTION
Digital Compressor Control Board Alarm
Compressor A1 Safety Trip
Service Test - Compressor A1 Safety Trip
Compressor A1 Current Detected After
Turnoff
Service Test - Compressor A1 Current
Detected After Turnoff
Circuit A Saturated Condensing Temp
Thermistor Failure
Circuit A Saturated Suction Temperature
Thermistor Failure
Outdoor Air Temperature Thermistor Failure
Space Temperature Thermistor Failure
Supply Air Temperature Thermistor Failure
Return Air Thermistor Failure
Space Relative Humidity Sensor Failure
Circuit A Suction Pressure Transducer
Failure
Compressor A1 Current Sensor Failure
Circuit A Loss of Charge
Service Test - Circuit A Loss of Charge
Circuit A High Discharge Pressure
Service Test - Circuit A High Discharge
Pressure
Circuit A Low Refrigerant Pressure
Service Test - Circuit A Low Refrigerant
Pressure
Circuit A Failure To Pressurize
Service Test - Circuit A Failure To
Pressurize
ACTION TAKEN BY
CONTROL
Real Timeclock Hardware Failure
Serial EEPROM Hardware Failure
Serial EEPRQM Storage Failure Error
Critical Serial EEPRQM Storage Fail Error
A/D Hardware Failure
Circuit A Down Due to Failure
Service Test - Circuit A Down Due to
Failure
No action
Add Strike for Circuit A
Add Strike for Circuit A
Turn off all
compressors
Turn off all
compressors
Use OAT to control
Outdoor fans
No Cooling
No cooling with
economizer
No heating or cooling
No cooling mode
No differential DB
crossover
If RH.S = Yes, then no
indoor humidity control
Shutdown Circuit A
If CS.A1 = Enable,
then no T051 current
alarm
Shutdown Circuit A
Shutdown Circuit A
Shutdown Circuit A
Shutdown Circuit A
Add Strike for Circuit A
Add Strike for Circuit A
Add Strike for Circuit A
Add Strike for Circuit A
No time and date
schedule operation
Unit Shutdown
Unit operation errors
Unit Shutdown
Unit Shutdown
Shutdown Circuit A
RESET
METHOD
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Manual
Automatic
Manual
Manual
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Manual
A163
Shutdown Circuit A Manual
PROBABLE CAUSE
See the DSC's LEDs for troubleshooting
Current Sensing turned on (CS.A1 = Enable) and
should be off
Current Sensing turned on (CS.A1 = Enable) and
should be off
Current Sensing turned on (CS.A1 = Enable) and
should be off
Current Sensing turned on (CS.A1 = Enable) and
should be off
Faulty, shorted, or open thermistor caused by wiring
error or loose connection.
Suction transducers internally forced inactive
Faulty, shorted, or open thermistor caused by wiring
error or loose connection.
Faulty, shorted, or open thermistor caused by wiring
error or loose connection.
Faulty, shorted, or open thermistor caused by wiring
error or loose connection.
Faulty, shorted, or open thermistor caused by wiring
error or loose connection.
Faulty, shorted, or open sensor caused by wiring
error or loose connection.
Faulty transducer, faulty 5-V power supply, or loose
connection
Current Sensing turned on (CS.A1 = Enable) and
should be off
Low refrigerant or faulty suction pressure transducer
Low refrigerant or faulty suction pressure transducer
An overcharged system, high outdoor ambient
temperature coupled with dirty outdoor coil, plugged
filter drier, or a faulty high-pressure switch.
An overcharged system, high outdoor ambient
temperature coupled with dirty outdoor coil, plugged
filter drier, or a faulty high-pressure switch.
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 is low.
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 is low.
Wiring causing reverse rotation or faulty compressor
Wiring causing reverse rotation or faulty compressor
No time/date configured, software failure, or MBB
failure
Software failure or MBB failure
Software failure or MBB failure
Software failure or MBB failure
Software failure or MBB failure
Circuit has 3 strikes or has been locked out by
another alarm
Circuit has 1 strike or has been locked out by another
alarm
See Legend on next page
29