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JOHNSON CONTROLS
138
FORM 150.63-NM6 (1020)
TABLE 41 –
ISN OPERATIONAL AND FAULT CODES
P56/58
OPERATIONAL CODE
P57/59
FAULT CODE
0
NO ABNORMAL CONDITION
0
NO FAULT
1
UNIT SWITCH OFF
1
VAC UNDER VOLTAGE
2
SYSTEM SWITCH OFF
2
LOW AMBIENT TEMPERATURE
3
LOCK-OUT
3
HIGH AMBIENT TEMPERATURE
4
UNIT FAULT
4
LOW LEAVING CHILLED LIQUID TEMP
5
SYSTEM FAULT
5
HIGH DISCHARGE PRESSURE
6
REMOTE SHUTDOWN
6
HIGH DIFFERENTIAL OIL PRESSURE
7
DAILY SCHEDULE SHUTDOWN
7
LOW SUCTION PRESSURE
8
NO RUN PERMISSIVE
8
HIGH MOTOR CURRENT
9
NO COOL LOAD
9
LLSV NOT ON
10
ANTI-COINCIDENCE TIMER ACTIVE
10
LOW BATTERY WARNING
11
ANTI-RECYCLE TIMER ACTIVE
11
HIGH OIL TEMPERATURE
12
MANUAL OVERRIDE
12
HIGH DISCHARGE TEMPERATE
13
SUCTION LIMITING
13
IMPROPER PHASE ROTATION
14
DISCHARGE LIMITING
14
LOW MOTOR CURRENT /MP / HPCO
15
CURRENT LIMITING
15
MOTOR CURRENT UNBALANCED
16
LOAD LIMITING
16
LOW DIFFERENTIAL OIL PRESSURE
17
COMPRESSOR(S) RUNNING
17
GROUND FAULT
18
HEAT PUMP LOAD LIMITING
18
MP /HPCO
19
LOW EVAPORATOR TEMPERATURE
20
INCORRECT REFRIGERANT
PROGRAMMED
21
POWER FAILURE, MANUAL RESET
REQUIRED
22
UNIT MOTOR CURRENT
23
LOW SUPERHEAT
24
SENSOR FAIL
26
MP /HPCO INHIBIT
* The operational and fault codes sent to pages 56 through 59 are defined in Table 41. Note that this table of fault and operational codes is for
all DX products. The codes that are grayed out are not used on all units.
Service and Troubleshooting
Summary of Contents for YCUL0045
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