163
Table 79 —Alarm and Alert Codes
LEGEND
ALARM/
ALERT CODE
ALARM OR
ALERT
DESCRIPTION
ACTION TAKEN
BY CONTROL
RESET
METHOD
DETAILS PAGE
REFERENCE
COMM FAIL
Alert
Communications Failure
If communications between the scrolling
marquee and the Main Base Board (MBB)
are lost, unit may continue to run. If the
communication is internal to the MBB, the
unit will shut down or not be allowed to
start.
Automatic once commun-
ciations are re-established
166
T048
Alert
Circuit A Compressor
Availability Alert
Circuit is shut down
Manual
166
T049
Alert
Circuit B Compressor
Availability Alert
Circuit shut down
Manual
166
A051
Alarm
Circuit A, Compressor 1
Stuck On Failure
All compressor outputs de-energized. Head
pressure control remains active.
Manual
166
T051
Alert
Circuit A, Compressor 1
Chattering Failure
Affected compressor is shut down
Manual
166
Circuit A, Compressor 1
Failure
Affected compressor is shut down
Manual
166
A052
Alarm
Circuit A, Compressor 2
Stuck On Failure
All compressor outputs de-energized. Head
pressure control remains active.
Manual
166
T052
Alert
Circuit A, Compressor 2
Chattering Failure
Affected compressor is shut down
Manual
166
Circuit A, Compressor 2
Failure
Affected compressor is shut down
Manual
166
A053
Alarm
Circuit A, Compressor 3
Stuck On Failure
All compressor outputs de-energized. Head
pressure control remains active.
Manual
166
T053
Alert
Circuit A, Compressor 3
Chattering Failure
Affected compressor is shut down
Manual
166
Circuit A, Compressor 3
Failure
Affected compressor is shut down
Manual
166
A055
Alarm
Circuit B, Compressor 1
Stuck On Failure
All compressor outputs de-energized. Head
pressure control remains active.
Manual
166
T055
Alert
Circuit B, Compressor 1
Chattering Failure
Affected compressor is shut down
Manual
166
Circuit B, Compressor 1
Failure
Affected compressor is shut down
Manual
166
A056
Alarm
Circuit B, Compressor 2
Stuck On Failure
All compressor outputs de-energized. Head
pressure control remains active.
Manual
166
T056
Alert
Circuit B, Compressor 2
Chattering Failure
Affected compressor is shut down
Manual
166
Circuit B, Compressor 2
Failure
Affected compressor is shut down
Manual
166
A057
Alarm
Circuit B, Compressor 3
Stuck On Failure
All compressor outputs de-energized. Head
pressure control remains active.
Manual
166
T057
Alert
Circuit B, Compressor 3
Chattering Failure
Affected compressor is shut down
Manual
166
Circuit B, Compressor 3
Failure
Affected compressor is shut down
Manual
166
A060
Alarm
Supply Air
Thermistor Failure
Unit shut down
Automatic
167
Alarm
Remote Supply Air Temperature
Update not received
Unit shut down
Automatic
167
A061
Alarm
Return Air
Thermistor Failure
Unit shut down
Automatic
167
Alarm
Remote Return Air Temperature
Update not received
Unit shut down
Automatic
167
T068
Alert
Circuit A Return Gas
Thermistor Failure
Circuit shut down
Automatic
167
T069
Alert
Circuit B Return Gas
Thermistor Failure
Circuit shut down
Automatic
167
T073
Alert
Outside Air
Thermistor Failure
Outside Air Temperature Reset will be dis-
abled and the unit will run under normal set
point control. Outdoor Ambient Lockout is
disabled.
Automatic 167
T074
Alert
Space Temperature
Thermistor Failure
Space Temperature Reset will be dis-
abled.and the unit will run under normal set
point control.
Automatic 167
T082
Alert
Space Temperature Offset
Sensor Failure
Space Temperature Offset disabled. Unit
will run under normal control without space
temperature offset.
Automatic
167
T090
Alert
Circuit A Discharge Pressure
Transducer Failure
Circuit A shut down
Automatic
167
T091
Alert
Circuit B Discharge Pressure
Transducer Failure
Circuit B shut down
Automatic
167
A/D
—
Analog/Digital
AUX
—
Auxiliary
EEPROM —
Electrically Erasable Programmable Read-Only Memory