Carrier 48/50PD05 User Manual page 29

ALARM
OR
DESCRIPTION
ALERT
NUMBER
Digital Compressor Control Board Alarm
Compressor A1 Safety Trip
Service Test --- Compressor A1 Safety Trip
T051
Compressor A1 Current Detected After
Turnoff
Service Test --- Compressor A1 Current
Detected After Turnoff
Circuit A Saturated Condensing Temp
T064
Thermistor Failure
Circuit A Saturated Suction Temperature
T066
Thermistor Failure
T073 Outdoor Air Temperature Thermistor Failure
T074 Space Temperature Thermistor Failure
T075 Supply Air Temperature Thermistor Failure
T076 Return Air Thermistor Failure
T077 Space Relative Humidity Sensor Failure
Circuit A Suction Pressure Transducer
T092
Failure
T102 Compressor A1 Current Sensor Failure
Circuit A Loss of Charge
T110
Service Test --- Circuit A Loss of Charge
Circuit A High Discharge Pressure
T126
Service Test --- Circuit A High Discharge
Pressure
Circuit A Low Refrigerant Pressure
T133
Service Test --- Circuit A Low Refrigerant
Pressure
Circuit A Failure To Pressurize
Service Test --- Circuit A Failure To
T143
Pressurize
T153 Real Timeclock Hardware Failure
A154 Serial EEPROM Hardware Failure
T155 Serial EEPROM Storage Failure Error
A156 Critical Serial EEPROM Storage Fail Error
A157 A/D Hardware Failure
Circuit A Down Due to Failure
A163
Service Test --- Circuit A Down Due to
Failure
* See Legend on next page
Table 8 — ComfortLink™ Alarm Codes
ACTION TAKEN BY
CONTROL
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
Shutdown Circuit A
29
RESET
PROBABLE CAUSE
METHOD
Automatic See the DSC's LEDs for troubleshooting
Current Sensing turned on (CS.A1 = Enable) and
Automatic
should be off
Current Sensing turned on (CS.A1 = Enable) and
Automatic
should be off
Current Sensing turned on (CS.A1 = Enable) and
Automatic
should be off
Current Sensing turned on (CS.A1 = Enable) and
Automatic
should be off
Faulty, shorted, or open thermistor caused by wiring
Automatic
error or loose connection.
Automatic Suction transducers internally forced inactive
Faulty, shorted, or open thermistor caused by wiring
Automatic
error or loose connection.
Faulty, shorted, or open thermistor caused by wiring
Automatic
error or loose connection.
Faulty, shorted, or open thermistor caused by wiring
Automatic
error or loose connection.
Faulty, shorted, or open thermistor caused by wiring
Automatic
error or loose connection.
Faulty, shorted, or open sensor caused by wiring
Automatic
error or loose connection.
Faulty transducer, faulty 5 ---V power supply, or loose
Manual
connection
Current Sensing turned on (CS.A1 = Enable) and
Automatic
should be off
Manual Low refrigerant or faulty suction pressure transducer
Manual Low refrigerant or faulty suction pressure transducer
An overcharged system, high outdoor ambient
Automatic temperature coupled with dirty outdoor coil, plugged
filter drier, or a faulty high ---pressure switch.
An overcharged system, high outdoor ambient
Automatic 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
Automatic
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
Automatic
air, or stuck open economizer when the ambient
temperature is low.
Automatic Wiring causing reverse rotation or faulty compressor
Automatic Wiring causing reverse rotation or faulty compressor
No time/date configured, software failure, or MBB
Automatic
failure
Automatic Software failure or MBB failure
Automatic Software failure or MBB failure
Automatic Software failure or MBB failure
Automatic Software failure or MBB failure
Circuit has 3 strikes or has been locked out by
Manual
another alarm
Circuit has 1 strike or has been locked out by another
Manual
alarm