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Table 104 — 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
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
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
T110 Circuit A Loss of Charge Circuit locked off Manual
T111 Circuit B Loss of Charge Circuit locked off Manual
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
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
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