8.6 - Alarm description
8.6.1 - Alarms
JBus
code
Code Alarm description Reset type Action taken Possible cause
Thermistor failure
1 15001 WATER EXCHANGER ENTERING FLUID
THERMISTOR
Automatic, if thermistor
reading returns to normal
Unit shuts down Defective thermistor
or connection
2 15002 WATER EXCHANGER LEAVING FLUID
THERMISTOR
As above Unit shuts down As above
3 15003 CIRCUIT A DEFROST THERMISTOR As above Cooling mode: Unit continues to
operate
Heating mode: Circuit A shuts down
As above
4 15004 CIRCUIT B DEFROST THERMISTOR As above Cooling mode: Unit continues to
operate
Heating mode: Circuit B shuts down
As above
5 15008 RECLAIM CONDENSER ENTERING
THERMISTOR FAILURE
Not applicable - -
6 15009 RECLAIM CONDENSER LEAVING
THERMISTOR FAILURE
Not applicable - -
7 15010 OAT THERMISTOR FAILURE As above Unit shuts down As above
8 15011 MASTER/SLAVE COMMON LEAVING
FLUID THERMISTOR
As above Master/slave operation is disabled
and the unit returns to the stand-
alone mode
As above
9 15012 CIRCUIT A SUCTION GAS THERMISTOR As above None As above
10 15013 CIRCUIT B SUCTION GAS THERMISTOR As above None As above
13 15021 SPACE TEMPERATURE THERMISTOR As above Unit continues to operate, but the
setpoint reset is cancelled
As above
14 15046 DC FREE COOLING WATER LOOP
THERMISTOR FAILURE
As above DCFC mode is stopped As above
15 15047 DC FREE COOLING LEAVING WATER
THERMISTOR FAILURE
As above DCFC mode is stopped As above
16 15048 DC FREE COOLING OAT SENSOR
FAILURE
As above OAT sensor reading is used instead
of Dry Cooler OAT
As above
Transducer failure
17 12001 CIRCUIT A DISCHARGE TRANSDUCER Automatic, if sensor
voltage reading returns
to normal
Circuit A shuts down Defective transducer
or connection
18 12002 CIRCUIT B DISCHARGE TRANSDUCER As above Circuit B shuts down As above
19 12004 CIRCUIT A SUCTION TRANSDUCER Null voltage: Automatic
(three alarms in the last
24 hours) or Manual
Impossible value:
Manual
Circuit A shuts down As above
20 12005 CIRCUIT B SUCTION TRANSDUCER As above Circuit B shuts down As above
21 12007 CIRCUIT A RECLAIM PUMPDOWN
PRESSURE TRANSDUCER
Not applicable - -
22 12008 CIRCUIT B RECLAIM PUMPDOWN
PRESSURE TRANSDUCER
Not applicable - -
23 12016 CIRCUIT A FREE COOLING PUMP INLET
PRESSURE TRANSDUCER
As above Free cooling cycle is stopped. Unit
returns to mechanical cooling
As above
25 12018 CIRCUIT B FREE COOLING PUMP INLET
PRESSURE TRANSDUCER
As above As above As above
24 12017 CIRCUIT A FREE COOLING PUMP OUTLET
PRESSURE TRANSDUCER
As above As above As above
26 12019 CIRCUIT B FREE COOLING PUMP
OUTLET PRESSURE TRANSDUCER
As above As above As above
27 12024 WATER EXCHANGER ENTERING FLUID
TRANSDUCER FAILURE
Automatic, if sensor
voltage reading returns
to normal
Unit shuts down, water pressure
calibration erased
As above
28 12025 WATER EXCHANGER LEAVING FLUID
TRANSDUCER FAILURE
As above Unit shuts down, water pressure
calibration erased
As above
Communication failure
29 4901 LOSS OF COMMUNICATION WITH
CIRCUIT A SIOB BOARD
Automatic, if
communication is
re-established
Unit shuts down Bus installation fault,
communication error
30 4902 LOSS OF COMMUNICATION WITH
CIRCUIT B SIOB BOARD
As above Unit shuts down As above
31 4904 LOSS OF COMMUNICATION WITH FREE
COOLING SIOB BOARD
As above Free cooling is stopped. Unit returns
to mechanical cooling
As above
32 4905 LOSS OF COMMUNICATION WITH HEAT
RECLAIM SIOB BOARD
Not applicable - -
8 - DIAGNOSTICS
50
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