JOHNSON CONTROLS
112
FORM 150.72-ICOM7
ISSUE DATE: 10/22/2020
SECTION 7 – UNIT CONTROLS
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
22 Unit Fault Unit High Motor Current (Unit Current Feedback Option) 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
17 System Fault System High Motor Current (System Current Feedback option) 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
Fault and Inhibit Codes and Reset
Table 14 shows the fault and inhibit codes and how to
reset them. There are three ways to reset the fault and
inhibit. See Table 15 for more information.
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