Table 56 - Troubleshooting Guide - York YCIV0157 Installation Operation & Maintenance

Form 201.23-NM2
Issue date: 12/19/2023

Table 56 - Troubleshooting guide

(Always remove power to the chiller and assure the DC Bus voltage has bled off)
Problem
Supply to the Panel is missing.
No Display On
Control Panel.
Line Fuse is blown.
Unit Will Not Run.
Chiller Control Board is defective.
Display Board defective.
SCR Diode Module is defective.
IBGT Module is defective.
Line Fuse Blows.
VSD Logic Board is defective.
SCR Trigger Board is defective
Ambient temperature is lower than the programmed
Chiller Fault:
operating limit.
Low Ambient
Temperature
Ambient Sensor is defective.
Ambient Temperature is above the maximum operating
Chiller Fault:
limit.
High Ambient
Temperature
Ambient Sensor is defective.
Leaving chilled liquid temperature drops faster than the
unit can unload.
Chiller Fault:
Low Leaving
Chilled Liquid
Chilled Water Sensor
is defective.
System Fault:
System Fuse is blown.
Control Voltage
Oil Temperature
Sensor is defective.
System Fault:
High Oil
Condenser Fans NOT operating or running backwards. Check Fans.
Temperature
Coils dirty.
Coils dirty.
Coils are damaged.
System Fault:
High
Discharge
Fans NOT operating.
Pressure
System is overcharged.
Johnson Controls
POSSIBLE CAUSE
Section 9 - Maintenance
ACTION
High Voltage to the Chiller is missing.
Check 1FU, 2FU, 4FU, 5FU, 17FU, or 19FU.
Check 2T or 10T Transformer.
Check Fuses.
Replace Chiller Control Board
Replace Display Board
Check SCR/Diode Module.
Check IBGT Module.
Replace VSD Logic Board.
Replace SCR Trigger Board.
Check the programmed cutout and determine
if it is programmed correctly
Check the panel against the thermometer
reading of ambient temperature
Check outside air temperature.
Check the Panel Display against Thermometer
reading of Ambient Temperature at the sensor.
Check for restricted flow.
Check for rapid flow changes.
Water loop is too small.
Flow is below minimum for chiller.
Check Sensor against Temp.
Gauge in water line.
Check Sensor for intermittent operation.
Check Wiring for shorts or opens.
Check respective system Fuse 20FU or 21FU.
Check Sensor with infrared to determine if
reading is reasonable.
Check and clean Coils.
Check and clean coils.
Comb out fins.
Check fan fuses.
Check fan rotation.
Check fan motor/blade.
Remove charge and check subcooling.
9
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