JOHNSON CONTROLS
131
FORM 150.62-NM6 (103)
3
TABLE 43 – 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 dened in Table 43. 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.
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