Specifications

80
Table 41 — Alert and Alarm Codes
ALARM
OR
ALERT
NUMBER
DESCRIPTION ACTION TAKEN BY CONTROL
RESET
METHOD
PROBABLE CAUSE
A051
A051 Circuit A, Compressor 1 Current Detected After
Shutdown
Turn off all compressors Manual Welded Contact
P051 Compressor A1 Safety Trip Add strike to Compressor
Automatic
(max 3)
High pressure switch, compressor
current, wiring error
T051 Circuit A, Compressor 1 Failure Compressor locked off Manual Exceeded 3 strike limit
A052 Circuit A, Compressor 2 Current Detected After Shutdown Turn off all compressors Manual Welded Contact
P052 Circuit A, Compressor 2 Failure Add strike to Compressor
Automatic
(max 3)
High pressure switch, compressor
current, wiring error
T052 Circuit A, Compressor 2 Failure Compressor locked off Manual Exceeded 3 strike limit
A055 Circuit B, Compressor 1 Current Detected After Shutdown Turn off all compressors Manual Welded Contact
P055 Circuit B, Compressor 1 Failure Add strike to Compressor
Automatic
(max 3)
High pressure switch, compressor
current, wiring error
T055 Circuit B, Compressor 1 Failure Compressor locked off Manual Exceeded 3 strike limit
A056 Circuit B, Compressor 2 Current Detected After Shutdown Turn off all compressors Manual Welded Contact
P056 Circuit B, Compressor 2 Failure Add strike to Compressor
Automatic
(max 3)
High pressure switch, compressor
current, wiring error
T056 Circuit B, Compressor 2 Failure Compressor locked off Manual Exceeded 3 strike limit
T064 Circuit A Saturated Condensing Thermistor Failure Use OAT for head pressure control Automatic Faulty thermistor or wiring error
T065 Circuit B Saturated Condensing Thermistor Failure Use OAT for head pressure control Automatic Faulty thermistor or wiring error
T072 Remote Setpoint/Reset Input Failure Unit Shutdown Automatic Faulty remote input on CEM board
T073 Outside Air Temperature Thermistor Failure Stop use of economizer Automatic Faulty thermistor or wiring error
T074 Space Temperature Thermistor Failure Unit Shutdown Automatic Faulty thermistor or wiring error
T075 Return Air Thermistor Failure Continue to run unit Automatic Faulty thermistor or wiring error
T076 Outside Air Relative Humidity Sensor Failure Use OAT changeover control Automatic Faulty sensor or wiring error
T077 Space Relative Humidity Sensor Failure not used at this time
T078 Return Air Relative Humidity Sensor Failure
Use differential drybulb
changeover
Automatic Faulty sensor or wiring error
T082 Space Temperature Offset Sensor Failure
Use Space temperature without
offset
Automatic Faulty sensor or wiring error
A083 Evaporator Discharge Temperature Sensor Failure Stop Unit Automatic Faulty sensor or wiring error
T092 Circuit A Suction Pressure Transducer Failure Stop circuit Automatic Faulty sensor, wiring error
T093 Circuit B Suction Pressure Transducer Failure Stop circuit Automatic Faulty sensor, wiring error
T110 Circuit A Loss of Charge Stop circuit Manual Low refrigerant charge
T111 Circuit B Loss of Charge Stop circuit Manual Low refrigerant charge
A120 Circuit A Low Saturated Suction Temperature Alarm. Stop circuit Manual
Low refrigerant charge, low airflow,
dirty coil, broken fan belt, TXV
problem
T120 Circuit A Low Saturated Suction Temperature Alert. Stop circuit Automatic
Low refrigerant charge, low airflow,
dirty coil, broken fan belt, TXV
problem
A121 Circuit B Low Saturated Suction Temperature Alarm. Stop circuit Manual
Low refrigerant charge, low airflow,
dirty coil, broken fan belt, TXV
problem
T121 Circuit B Low Saturated Suction Temperature Alert. Stop circuit Automatic
Low refrigerant charge, low airflow,
dirty coil, broken fan belt, TXV
problem
T122 Circuit A High Saturated Suction Temperature Stop circuit Manual TXV problem
T123 Circuit B High Saturated Suction Temperature Stop circuit Manual TXV problem
T126 Circuit A High Head Pressure Stop circuit Automatic
Dirty condenser, condenser fan
failure
T127 Circuit B High Head Pressure Stop circuit Automatic
Dirty condenser, condenser fan
failure
A140 Reverse Rotation Detected Stop unit Manual Power phased wrong
A150 Unit is in Emergency Stop Stop units Manual External shutdown command
A151 Illegal Configuration Stop unit Manual
Unit configured wrong, check
configuration
A151 Illegal Configuration - More Than Two Elec. Heat Stages Stop unit Manual
Unit configured wrong, check
configuration
A151 Ill Config. - Number of Heat Stages Must be 0, 2, 4, or 6 Stop unit Manual
Unit configured wrong, check
configuration
A152 Unit Down due to Failure Stop unit Manual
T153 Real Time Clock Hardware Failure Stop unit Manual Control Board failure, check lights
A154 Serial EEPROM Hardware Failure Stop unit Manual Control Board failure, check lights
T155 Serial EEPROM Storage Failure Error Stop unit Manual Control Board failure, check lights
A156 Critical Serial EEPROM Storage Failure Error Stop unit Manual Control Board failure, check lights
A157 A/D Hardware Failure Stop unit Manual Control Board failure, check lights
A163 Circuit A Failure Stop circuit Manual Exceeded 3 strike limit
A164 Circuit B Failure Stop circuit Manual Exceeded 3 strike limit
A165 Circuit C Failure Stop circuit Manual Exceeded 3 strike limit