JOHNSON CONTROLS
131
SECTION 7 – UNIT CONTROLS
FORM 150.72-ICOM6
ISSUE DATE: 08/03/2022
7
CODE TYPE FAULT OR INHIBIT DESCRIPTION
AUTO, 1X, 3X
(SEE LEGEND)
2 Unit Fault Low Ambient Temperature Auto
4 Unit Fault Low Leaving Chilled Liquid Temperature Auto
27 Unit Fault Pump Trip (Hydro Pumps 1 or Hydro Pumps 2) Auto
28 Unit Fault Pump Flow Failure (Hydro Pumps 1 or Hydro Pumps 2) 1x
29 Unit Fault High Ambient Temperature Auto
31 Unit Fault Flow Switch Open Auto
5 System Fault High Discharge Pressure (Software) 3x
7 System Fault Low Suction Pressure 3x
18 System Fault Motor Protector/High Pressure (Mechanical) 3x
19 System Fault Low Evaporator Temperature (R407c Only - N/A Hp Heating Mode) 3x
23 System Fault Low Suction Superheat (EEV) 3x
24 System Fault Sensor Failure (EEV) 1x
25 System Fault Discharge Inhibit (Heat Pump heating mode only) 3x
26 System Inhibit Motor Protector/High Pressure Inhibit Auto
TABLE 14 - YLAA FAULT AND INHIBIT CODES
TYPE DEFINITION
3X Automatically restarts on the rst and second fault with a lockout on the third fault in 90 minutes
1X Locks out on the rst fault
AUTO Allows restart once meeting the required conditions
TABLE 15 - LEGEND
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