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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
T197 Alert
Flow Lost While Pump 2
Running
Cooler flow switch contacts
open for 3 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 and flow switch
is closed.
Manual
Wiring error, pump
circuit breaker
tripped, contactor
failure
T198 Alert
Cooler Pump 1 Aux
Contacts Closed While
Pump Off
Pump 1 Auxiliary Contacts
closed for 26 seconds
when pump state is off
Chiller not allowed to
start
Automatic when
aux contacts open
Wiring error, faulty
pump contactor
(welded contacts)
T199 Alert
Cooler Pump 2 Aux
Contacts Closed While
Pump Off
Pump 2 Auxiliary Contacts
closed for 26 seconds
when pump state is off
Chiller not allowed to
start
Automatic when
aux contacts open
Wiring error, faulty
pump contactor
(welded contacts)
T200 Alert
Cooler Flow/Interlock
Contacts Failed to Close
at Start-Up
Cooler flow switch contacts
failed to close within
1 minute (if cooler pump
control is enabled) or
within 5 minutes (if cooler
pump control is not
enabled) after start-up
Chiller not allowed to
start. For models with
dual pumps, the
second pump will be
started if available
Manual
Wiring error, pump
circuit breaker
tripped, contactor
failure, faulty flow
switch or interlock
A201 Alarm
Cooler Flow/Interlock
Contacts Opened
During Normal
Operation
Flow switch opens for at
least 3 seconds after
being initially closed
All compressors shut
down. For models with
dual pumps, the
second pump will be
started if available
Manual
Cooler pump failure,
faulty flow switch or
interlock, pump
circuit breaker
tripped
A202 Alarm
Cooler Pump Interlock
Closed When Pump is
Off
If configured for cooler
pump control and flow
switch input is closed for
5 minutes while pump
output(s) are off
Chiller shut down
Automatic when
aux contacts open
Wiring error, faulty
pump contactor
(welded contacts)
T203 Alert
Loss of Communication
with Slave Chiller
Master chiller MBB
loses communication
with slave chiller MBB
Dual chiller control
disabled. Chiller runs
as a stand-alone
machine.
Automatic
Wiring error, faulty
wiring, failed Slave
chiller MBB module,
power loss at slave
chiller, wrong slave
address.
T204 Alert
Loss of Communication
with Master Chiller
Slave chiller MBB loses
communication with
master chiller MBB
Dual chiller control
disabled. Chiller runs
as a stand-alone
machine
Automatic
Wiring error, faulty
wiring, failed master
chiller MBB module,
power loss at Master
chiller.
T205 Alert
Master and Slave Chiller
with Same Address
Master and slave chiller
have the same CCN
address (CCN.A)
Dual chiller routine
disabled. Master/slave
run as stand-alone
chillers.
Automatic
CCN Address for
both chillers is the
same. Must be
different. Check
CCN.A under the
OPT2 sub-mode in
Configuration at both
chillers.
T206 Alert
High Leaving Chilled
Water Temperature
LWT read is greater than
LCW Alert Limit, Total
capacity is 100% and LWT
is greater than LWT
reading one minute ago
Alert only. No action
taken.
Automatic
Building load greater
than unit capacity,
low water/brine flow
or compressor fault.
Check for other
alarms/alerts.
A207 Alarm
Cooler Freeze
Protection
Cooler EWT or LWT is less
than Brine Freeze (BR.FZ)
Chiller shutdown
without going through
pumpdown. Cooler
pump continues to
run a minimum of
5 minutes (if control
enabled).
Both EWT and LWT
must be at least 6 F
(3.3 C) above Brine
Freeze point
(BR.FZ).
Automatic for first,
Manual reset thereaf-
ter.
Faulty thermistor,
low water flow.
A208 Alarm
EWT or LWT
Thermistor failure
Cooler EWT is less than
LWT by 3° F (1.7° C) for
1 minute after a circuit is
started
Chiller shutdown.
Cooler pump shut off
(if control enabled).
Manual
Faulty cooler pump,
low water flow,
plugged fluid
strainer.
T300 Alert
Cooler Pump 1
Scheduled
Maintenance Due
Pump 1 Service
Countdown (P.1.DN)
expired. Complete pump 1
maintenance and enter
'YES' for Pump 1
Maintenance Done
(P.1.MN) item.
None Automatic
Routine pump
maintenance
required
T301 Alert
Cooler Pump 2
Scheduled
Maintenance Due
Pump 2 Service
Countdown (P.2.DN)
expired. Complete pump 2
maintenance and
enter 'YES' for Pump 1
Maintenance Done
(P.2.MN) item.
None Automatic
Routine pump
maintenance
required