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Table 42 — 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
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.
A172 Alarm
Loss of Communication
with EXV Board
MBB loses communication
with EXV board
Chiller is not allowed
to run.
Automatic
Wiring error, faulty
wiring or failed
EXV board.
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.
T175 Alert
Loss of Communication
with the AUX Board
MBB loses communication
with AUX Board.
Automatic
Wiring error, faulty
wiring or failed
AUX board.
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.
A189 Alarm
Cooler Pump Auxiliary
Contact Inputs Miswired
Pump 1 Auxiliary Contacts
are closed when Pump 2
output is energized or if
Pump 2 Auxiliary Contacts
are closed when Pump 1
output is energized.
Both pump outputs
are turned off.
Manual
Wiring error, faulty
pump contactor
auxiliary contacts.
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
T196 Alert
Flow Lost While Pump 1
Running
Cooler flow switch contacts
open for 3 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 and flow switch
is closed.
Manual
Wiring error, pump
circuit breaker
tripped, contactor
failure