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
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