JOHNSON CONTROLS
156
FORM 150.73-NM1
ISSUE DATE: 09/04/2020
SECTION 10 – MAINTENANCE
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
REQUIRED
POWER FAILURE, MANUAL RESET
22 UNIT MOTOR CURRENT
23 LOW SUPERHEAT
24 SENSOR FAIL
25 DISCHARGE INHIBIT
26 MP/HPCO INHIBIT
27 PUMP TRIP
28 PUMP FAIL MAKE FLOW
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