JOHNSON CONTROLS
316
FORM 201.23-NM2
ISSUE DATE: 3/9/2015
SECTION 9 - MAINTENANCE
TROUBLESHOOTING GUIDE
PROBLEM
POSSIBLE CAUSE
ACTION
No Display On
Control Panel.
Unit Will Not Run.
Supply to the Panel is missing.
High Voltage to the Chiller is missing.
Check 1FU, 2FU, 4FU, 5FU, 17FU, or 19FU.
Check 2T or 10T Transformer.
Line Fuse is blown.
Check Fuses.
Chiller Control Board is defective.
Replace Chiller Control Board
Display Board defective.
Replace Display Board
Line Fuse Blows.
SCR Diode Module is defective.
Check SCR/Diode Module.
IBGT Module is defective.
Check IBGT Module.
VSD Logic Board is defective.
Replace VSD Logic Board.
SCR Trigger Board is defective
Replace SCR Trigger Board.
Chiller Fault:
Low Ambient
Temperature
Ambient temperature is lower than the programmed
operating limit.
Check the programmed cutout and determine
if it is programmed correctly
Ambient Sensor is defective.
Check the panel against the thermometer
reading of ambient temperature
Chiller Fault:
High Ambient
Temperature
Ambient Temperature is above the maximum operating
limit.
Check outside air temperature.
Ambient Sensor is defective.
Check the Panel Display against Thermometer
reading of Ambient Temperature at the sensor.
Chiller Fault:
Low Leaving
Chilled Liquid
Leaving chilled liquid temperature drops faster than the
unit can unload.
Check for restricted flow.
Check for rapid flow changes.
Water loop is too small.
Flow is below minimum for chiller.
Chilled Water Sensor
is defective.
Check Sensor against Temp.
Gauge in water line.
Check Sensor for intermittent operation.
Check Wiring for shorts or opens.
System Fault:
Control Voltage
System Fuse is blown.
Check respective system Fuse 20FU or 21FU.
System Fault:
High Oil
Temperature
Oil Temperature
Sensor is defective.
Check Sensor with infrared to determine if
reading is reasonable.
Condenser Fans NOT operating or running backwards. Check Fans.
Coils dirty.
Check and clean Coils.
System Fault:
High
Discharge
Pressure
Coils dirty.
Check and clean coils.
Coils are damaged.
Comb out fins.
Fans NOT operating.
Check fan fuses.
Check fan rotation.
Check fan motor/blade.
System is overcharged.
Remove charge and check subcooling.
(Always remove power to the chiller and assure the DC Bus voltage has bled off)
Summary of Contents for YCIV0157
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