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Table 29 — Alarm and Alert Codes (cont)
ALARM/
ALERT
CODE
ALARM
OR
ALERT
DESCRIPTION
WHY WAS THIS
ALARM
GENERATED?
ACTION TAKEN
BY CONTROL
RESET
METHOD
PROBABLE
CAUSE
A140 Alert Reverse Rotation
Detected
Incoming chiller power
leads not phased correctly
Chiller not allowed to
start.
Manual Reverse any two
incoming power
leads to correct.
Check for correct fan
rotation first.
A150 Alarm Emergency Stop SCN emergency stop
command received
Chiller shutdown
without going through
pumpdown.
Automatic once SCN
command for
EMSTOP returns to
normal
SCN Network
command.
A151 Alarm Illegal Configuration One or more illegal
configurations exists.
Chiller is not allowed to
start.
Manual once
configuration errors
are corrected
Configuration error.
Check unit settings.
A152 Alarm Unit Down Due to
Failure
Both circuits are down due
to alarms/alerts.
Chiller is unable
to run.
Automatic once
alarms/alerts are
cleared that prevent
the chiller from
starting.
Alarm notifies user
that chiller is 100%
down.
T153 Alert Real Time Clock
Hardware Failure
Internal clock on MBB fails Occupancy schedule
will not be used. Chiller
defaults to Local On
mode.
Automatic when
correct clock control
restarts.
Time/Date/Month/
Day/Year not
properly set.
A154 Alarm Serial EEPROM
Hardware Failure
Hardware failure with MBB Chiller is unable
to run.
Manual Main Base Board
failure.
T155 Alert Serial EEPROM
Storage Failure
Configuration/storage
failure with MBB
No Action Manual Potential failure of
MBB. Download
current operating
software. Replace
MBB if error occurs
again.
A156 Alarm Critical Serial EEPROM
Storage Failure
Configuration/storage
failure with MBB
Chiller is not allowed
to run.
Manual Main Base Board
failure.
A157 Alarm A/D Hardware Failure Hardware failure with
peripheral device
Chiller is not allowed
to run.
Manual Main Base Board
failure.
A189 Alarm Cooler pump auxiliary
contact inputs miswired
Pump 1 (2) aux contacts
closed when pump 2 (1)
energized.
Both pump outputs
are turned off.
Manual Wiring error, faulty
pump contactor
auxiliary contacts.
T173 Alert Loss of Communication
with EMM
MBB loses communication
with EMM
4 to 20 mA
temperature reset
disabled. Demand
Limit set to 100%. 4 to
20 mA set point
disabled.
Automatic Wiring error, faulty
wiring or failed
Energy Manage-
ment Module (EMM).
T174 Alert 4 to 20 mA Cooling Set
Point Input Failure
If configured with EMM and
input less than 2 mA or
greater than 22 mA
Set point function
disabled. Chiller
controls to CSP1.
Automatic Faulty signal
generator, wiring
error, or faulty EMM.
T176 Alert 4 to 20 mA
Temperature Reset
Input Failure
If configured with EMM
and input less than 2 mA or
greater than 22 mA
Reset function
disabled. Chiller
returns to normal set
point control.
Automatic Faulty signal
generator, wiring
error, or faulty EMM.
T177 Alert 4 to 20 mA Demand
Limit Input Failure
If configured with EMM and
input less than 2 mA or
greater than 22 mA
Demand limit function
disabled. Chiller
returns to 100%
demand limit
control.
Automatic Faulty signal
generator, wiring
error, or faulty EMM.
T189 Alarm Cooler pump 2 and
Aux Contact Input
miswired
Alarm is generated when
the pump’s aux contacts
close when a pump is
called for
Chiller not allowed to
start
Manual Wiring error
T190 Alert Cooler pump 1 Aux
Contacts Failed to Close
at Start-Up
Pump 1 Auxiliary Contacts
did not close within
26 seconds after pump
was started
Pump 1 turned off.
Pump 2 will be started
if available.
Manual Wiring error, faulty
contacts on pump
contactor
T191 Alert Cooler pump 2 Aux
Contacts Failed to Close
at Start-Up
Pump 2 Auxiliary Contacts
did not close within
26 seconds after pump
was started
Pump 2 turned off.
Pump 1 will be started
if available.
Manual Wiring error, faulty
contacts on pump
contactor
T192 Alert Cooler pump 1 Failed
to Provide Flow at
Start-Up
Pump 1 did not provide
flow to close flow switch
within 60 seconds
Pump 1 turned off.
Pump 2 will be started
if available.
Manual Wiring error, pump
circuit breaker
tripped, contactor
failure
T193 Alert Cooler pump 2 Failed
to Provide Flow at
Start-Up
Pump 2 did not provide
flow to close flow switch
within 60 seconds
Pump 1 turned off.
Pump 2 will be started
if available.
Manual Wiring error, pump
circuit breaker
tripped, contactor
failure
T194 Alert Cooler pump 1 Aux
Contacts Opened
During Normal
Operation
Pump 1 Auxiliary Contacts
open for 26 seconds after
initially made. All
compressors shut down.
Pump 1 turned off.
Pump 2 will be started
if available. Chiller
allowed to run if
Pump 2 successfully
starts.
Manual Wiring error, faulty
contacts on pump
contactor
T195 Alert Cooler pump 2 Aux
Contacts Opened
During Normal
Operation
Pump 2 Auxiliary Contacts
open for 26 seconds after
initially made. All
compressors shut down.
Pump 2 turned off.
Pump 1 will be started
if available. Chiller
allowed to run if
Pump 1 successfully
starts.
Manual Wiring error, faulty
contacts on pump
contactor