Table 114 — Alert and Alarm Codes
ALARM OR |
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| RESET |
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ALERT | DESCRIPTION | ACTION TAKEN BY CONTROL | PROBABLE CAUSE | ||
METHOD | |||||
NUMBER |
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A051 | Circuit A, Compressor 1 Stuck On Failure | Turn off all compressors | Manual | Welded contact | |
P051 | Circuit A, Compressor 1 Failure | Add strike to compressor | Automatic | High pressure switch, compressor | |
(max 3) | current, wiring error | ||||
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T051 | Circuit A, Compressor 1 Failure | Compressor locked off | Manual | Exceeded 3 strike limit | |
A052 | Circuit A, Compressor 2 Stuck On Failure | Turn off all compressors | Manual | Welded contact | |
P052 | Circuit A, Compressor 2 Failure | Add strike to compressor | Automatic | High pressure switch, compressor | |
(max 3) | current, wiring error | ||||
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T052 | Circuit A, Compressor 2 Failure | Compressor locked off | Manual | Exceeded 3 strike limit | |
A055 | Circuit B, Compressor 1 Stuck On Failure | Turn off all compressors | Manual | Welded contact | |
P055 | Circuit B, Compressor 1 Failure | Add strike to compressor | Automatic | High pressure switch, compressor | |
(max 3) | current, wiring error | ||||
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T055 | Circuit B, Compressor 1 Failure | Compressor locked off | Manual | Exceeded 3 strike limit | |
A056 | Circuit B, Compressor 2 Stuck On Failure | Turn off all compressors | Manual | Welded contact | |
P056 | Circuit B, Compressor 2 Failure | Add strike to compressor | Automatic | High pressure switch, compressor | |
(max 3) | current, wiring error | ||||
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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 | |
(48/50AJ,AK,AW,AY units only) | |||||
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T065 | Circuit B Saturated Condensing Thermistor Failure | Use OAT for head pressure control | Automatic | Faulty thermistor or wiring error | |
(48/50AJ,AK,AW,AY units only) | |||||
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T072 | Evaporator Discharge Reset Sensor 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 | |
T078 | Return Air Relative Humidity Sensor Failure | Use differential dry bulb changeover | Automatic | Faulty sensor or wiring error | |
T082 | Space Temperature Offset Sensor Failure | Use Space temperature without offset | Automatic | Faulty sensor or wiring error | |
T090 | Circuit A Discharge Pressure Transducer Failure | Stop circuit | Automatic | Faulty sensor, wiring error | |
T091 | Circuit B Discharge Pressure Transducer Failure | Stop circuit | Automatic | Faulty sensor, 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 |
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| Low refrigerant charge, low airflow, | |
Circuit A Low Saturated Suction Temperature Alarm. | Stop circuit | Manual | dirty coil, broken fan belt, TXV | ||
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| problem | |
P120 |
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| Low refrigerant charge, low airflow, | |
Circuit A Low Saturated Suction | Compressor A2 shutdown | Automatic | dirty coil, broken fan belt, TXV | ||
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| problem | |
T120 |
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| Low refrigerant charge, low airflow, | |
Circuit A Low Saturated Suction Temperature Alert. | Stop circuit | Automatic | dirty coil, broken fan belt, TXV | ||
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| problem | |
A121 |
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| Low refrigerant charge, low airflow, | |
Circuit B Low Saturated Suction Temperature Alarm. | Stop circuit | Manual | dirty coil, broken fan belt, TXV | ||
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| problem | |
P121 |
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| Low refrigerant charge, low airflow, | |
Circuit B Low Saturated Suction | Compressor B2 shutdown | Automatic | dirty coil, broken fan belt, TXV | ||
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| problem | |
T121 |
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| Low refrigerant charge, low airflow, | |
Circuit B Low Saturated Suction Temperature Alert. | Stop circuit | Automatic | dirty coil, broken fan belt, TXV | ||
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| problem | |
T122 | Circuit A High Saturated Suction Temperature | Stop circuit | Manual | TXV problem, high load. | |
T123 | Circuit B High Saturated Suction Temperature | Stop circuit | Manual | TXV problem, high load. | |
T126 | Circuit A High Head Pressure | Stop circuit | Automatic | Dirty condenser, condenser fan | |
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| failure, system overcharged | |
T127 | Circuit B High Head Pressure | Stop circuit | Automatic | Dirty condenser, condenser fan | |
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| failure, system overcharged | |
A140 | Reverse Rotation Detected | Stop unit | Manual | Incorrect compressor wiring | |
A150 | Unit is in Emergency Stop | Stop unit | Manual | External shutdown command | |
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 | |
A171 | Staged Gas Control Board Comm Failure | Stop gas heat | Automatic | Control Board failure, check lights | |
A172 | Controls Expansion Module Comm Failure | Stop options on CEM | Automatic | Control Board failure, check lights | |
A173 | ECB1 Board Communication Failure | Stop economizer & power exh | Automatic | Control Board failure, check lights | |
A174 | ECB2 Board Communication Failure | Stop unit | Automatic | Control Board failure, check lights | |
T177 | Stop demand limiting | Automatic | Input failure, wiring error | ||
T178 | Stop static pressure reset/VFD | Automatic | Input Failure, wiring error | ||
A200 | Linkage Timeout Error - Communication Failure | Stop unit | Manual | Wiring errors, board failures | |
T210 | Building Pressure Transducer Failure | Close economizer, stop exhaust | Automatic | Sensor failure, wiring error | |
T211 | Static Pressure Transducer Failure | Stop unit | Automatic | Sensor failure, wiring error | |
T220 | Indoor Air Quality Sensor Failure | Stop IAQ control | Automatic | Sensor failure, wiring error | |
T221 | Outdoor Air Quality Sensor Failure | Use a default value for IAQ | Automatic | Sensor failure, wiring error | |
T229 | Economizer Minimum Position Override Input Failure | Use software configured | Automatic | Input failure, wiring error | |
minimum | |||||
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