Table 15: Ylaa Fault And Inhibit Codes; Table 16: Legend - York YLAA0041 Installation Operation & Maintenance

Section 7: Unit controls

Table 15: YLAA Fault and Inhibit Codes

Code Type
2
Unit Fault
4
Unit Fault
22 Unit Fault
27 Unit Fault
28 Unit Fault
29 Unit Fault
31 Unit Fault
5 System Fault
7 System Fault
17 System Fault
18 System Fault
19 System Fault
23 System Fault
24 System Fault
25 System Fault
26 System Inhibit
30 System Inhibit
32 System Inhibit
33 System Inhibit

Table 16: Legend

Type
3x
Automatically restarts on the first and second fault with a lockout on the third fault in 90 minutes
1x
Locks out on the first fault
Auto
Allows restart once meeting the required conditions
142
Fault or Inhibit Description
Low Ambient Temperature
Low Leaving Chilled Liquid Temperature
Unit High Motor Current (Unit Current Feedback Option)
Pump Trip (Hydro Pumps 1 or Hydro Pumps 2)
Pump Flow Failure (Hydro Pumps 1 or Hydro Pumps 2)
High Ambient Temperature
Flow Switch Open
High Discharge Pressure (Software)
Low Suction Pressure
System High Motor Current (System Current Feedback option)
Motor Protector/High Pressure (Mechanical)
Low Evaporator Temperature (R407c Only - N/A Hp Heating Mode)
Low Suction Superheat (EEV)
Sensor Failure (EEV)
Discharge Inhibit (Heat Pump heating mode only)
Motor Protector/High Pressure Inhibit
Anti-Vacuum Low Pressure Cutout
Leaving Chilled Liquid Temperature Sensor Fault
Low Discharge Superheat
Definition
Form 150.72-ICOM6
Issue date: 12/19/2023
Auto, 1x, 3x
See Table 16
Auto
Auto
Auto
Auto
1x
Auto
Auto
3x
3x
3x
3x
3x
3x
1x
3x
Auto
3x
3x
Auto
Johnson Controls