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Table 92 — Alert and Alarm Codes
ALARM
OR
ALERT
NUMBER
DESCRIPTION ACTION TAKEN BY CONTROL RESET METHOD
T048 CktA, Oil Return Not Reliable With Only One Comp Available Circuit shut down Automatic
T049 CktB, Oil Return Not Reliable With Only One Comp Available Circuit shut down Automatic
T051 Circuit A, Compressor 1 Failure Compressor locked off (after 3 strikes) Automatic then manual after 3 strikes
A051 Circuit A, Compressor 1 Stuck On Failure Compressor locked off Manual
T052 Circuit A, Compressor 2 Failure Compressor locked off (after 3 strikes) Automatic then manual after 3 strikes
A052 Circuit A, Compressor 2 Stuck On Failure Compressor locked off Manual
T053 Circuit A, Compressor 3 Failure Compressor locked off (after 3 strikes) Automatic then manual after 3 strikes
A053 Circuit A, Compressor 3 Stuck On Failure Compressor locked off Manual
T054 Circuit B, Compressor 1 Failure Compressor locked off (after 3 strikes) Automatic then manual after 3 strikes
A054 Circuit B, Compressor 1 Stuck On Failure Compressor locked off Manual
T055 Circuit B, Compressor 2 Failure Compressor locked off (after 3 strikes) Automatic then manual after 3 strikes
A055 Circuit B, Compressor 2 Stuck On Failure Compressor locked off Manual
T056 Circuit B, Compressor 3 Failure Compressor locked off (after 3 strikes) Automatic then manual after 3 strikes
A056 Circuit B, Compressor 3 Stuck On Failure Compressor locked off Manual
T057 Circuit A, High Pressure Switch Failure Compressor locked off (after 3 strikes) Automatic then manual after 3 strikes
A057 Circuit A, High Pressure Switch Failure Compressor locked off Manual
T058 Circuit B, High Pressure Switch Failure Compressor locked off (after 3 strikes) Automatic then manual after 3 strikes
A058 Circuit B, High Pressure Switch Failure Compressor locked off Manual
T059 Circuit A, Compressor 4 Failure Compressor locked off (after 3 strikes) Automatic then manual after 3 strikes
A059 Circuit A, Compressor 4 Stuck On Failure Compressor locked off Manual
T060 Circuit B, Compressor 4 Failure Compressor locked off (after 3 strikes) Automatic then manual after 3 strikes
A061 Circuit B, Compressor 4 Stuck On Failure Compressor locked off Manual
T062 Circuit A Suction Pressure Alert Alert Only Automatic
T063 Circuit B Suction Pressure Alert Alert Only Automatic
T064 EXV A1 Superheat Outside Range Alert Only Automatic
T065 EXV A2 Superheat Outside Range Alert Only Automatic
T066 EXV B1 Superheat Outside Range Alert Only Automatic
T067 EXV B2 Superheat Outside Range Alert Only Automatic
T068 Circuit A, Return Gas Thermistor Failure MLV Disabled Automatic
T072 Evap. Discharge Reset Sensor Failure No supply air reset applied Automatic
T073 Outside Air Temperature Thermistor Failure No OAT functions allowed Automatic
T074 Space Temperature Thermistor Failure No SPT functions allowed Automatic
T075 Return Air Thermistor Failure No RAT functions allowed Automatic
T076 Outside Air Relative Humidity Sensor Fail No outside air RH functions allowed Automatic
T077 Space Relative Humidity Sensor Failure No space RH functions allowed Automatic
T078 Return Air Relative Humidity Sensor Fail No return air RH functions allowed Automatic
T079 Mixed Air Relative Humidity Sensor Fail No mixed air RH functions allowed Automatic
T082 Space Temperature Offset Sensor Failure No space temperature offset applied Automatic
T090 Circ A Discharge Press Transducer Failure Circuit shut down Automatic
T091 Circ B Discharge Press Transducer Failure Circuit shut down Automatic
T092 Circ A Suction Press Transducer Failure Circuit shut down Automatic
T093 Circ B Suction Press Transducer Failure Circuit shut down Automatic
T094 Circ A EXV 1 Thermistor Failure Circuit shut down Automatic
T095 Circ A EXV 2 Thermistor Failure Circuit shut down Automatic
T096 Circ B EXV 1 Thermistor Failure Circuit shut down Automatic
T097 Circ B EXV 2 Thermistor Failure Circuit shut down Automatic
T098 Cir A Liquid Temperature Thermistor Failure Alert Only - no circuit prognostics Automatic
T099 Cir B Liquid Temperature Thermistor Failure Alert Only - no circuit prognostics Automatic
T100 Circ A Liquid Press Transducer Failure Alert Only - no circuit prognostics Automatic
T101 Circ B Liquid Press Transducer Failure Alert Only - no circuit prognostics Automatic
T110 Circuit A Loss of Charge Circuit locked off Manual
T111 Circuit B Loss of Charge Circuit locked off Manual
T112 Low Circuit A Charge Detected Alert Only Automatic
T113 Low Circuit B Charge Detected Alert Only Automatic
T114 High Circuit A Charge Detected Alert Only Automatic
T115 High Circuit B Charge Detected Alert Only Automatic
P120 Circuit A Low Saturated Suction Temp, Comp Shutdown Circuit staged down Automatic
T120 Circuit A Low Saturated Suction Temperature Alert Circuit shut down Automatic
A120 Circuit A Low Saturated Suction Temperature Alarm Circuit locked off Manual
P121 Circuit B Low Saturated Suction Temp, Comp Shutdown Circuit staged down Automatic
T121 Circuit B Low Saturated Suction Temperature Alert Circuit shut down Automatic
A121 Circuit B Low Saturated Suction Temperature Alarm Circuit locked off Manual
T122 Circuit A High Saturated Suction Temperature Alert Only Manual
T123 Circuit B High Saturated Suction Temperature Alert Only Manual
P126 Circuit A High Head Pressure, Comp Shutdown Circuit stage down Automatic
T126 Circuit A High Head Pressure Alert Circuit shut down Automatic
A126 Circuit A High Head Pressure Alarm Circuit locked off Manual
P127 Circuit B High Head Pressure, Comp Shutdown Circuit stage down Automatic
T127 Circuit B High Head Pressure Alert Circuit shut down Automatic
A127 Circuit B High Head Pressure Alarm Circuit locked off Manual
T128 Digital Scroll High Discharge Temperature Alert Digital compressor A1 shutdown Automatic
A128 Digital Scroll High Discharge Temperature Alarm Digital compressor A1 locked off Manual
T130 Circuit A Filter Drier Alert Alert Only Automatic
T131 Circuit B Filter Drier Alert Alert Only Automatic
A140 Reverse Rotation Detected Stop unit Manual
A150 Unit is in Emergency Stop Unit shut down Manual
A152 Unit Down due to Failure No mechanical cooling available Automatic
T153 Real Time Clock Hardware Failure Unit shut down Automatic
A154 Serial EEPROM Hardware Failure Unit shut down Automatic
T155 Serial EEPROM Storage Failure Error Alert only Automatic
A156 Critical Serial EEPROM Storage Fail Error Unit shut down Automatic
A157 A/D Hardware Failure Unit shut down Automatic
A169 Expansion Valve Control Board Comm Failure Humidimizer control disabled Automatic
T170 Compressor Expansion Board Comm Failure Compressors A3, A4, B3 and B4 disabled Automatic
A171 Staged Gas Control Board Comm Failure Staged gas control disabled Automatic
T172 Control Expansion Module Comm Failure All CEM board functions disabled Automatic
A173 RXB board Communication Failure Unit shut down Automatic
A174 EXB board Communication Failure All EXB board functions disabled Automatic
A175 Supply Fan VFD Communication Failure Unit shut down Automatic
T176 Exhaust Fan VFD Communication Failure No building pressure control Automatic
T177 4-20 mA Demand Limit Failure No demand limiting Automatic
T178 4-20 mA Static Pressure Reset Fail No static pressure reset Automatic
A179 Cir A EXV Control Board Comm Failure Circuit shut down Automatic
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