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GP Series Portable Chillers Chapter 6: Troubleshooting 54 of 90
water temperature too low
and air flow or condenser inlet
water temperature.
Too little refrigerant in
system.
Contact customer service for
service call
Water cooled condenser valve
stuck open
Verify cooling valve operation.
Fan VFD output at 100%
Verify VFD is in remote versus
manual operation. Verify
controller output to VFD.
Low Fluid Temp Warning
29
W
Low Level Warning 30 W
Fluid level lower than
parameter setting.
Verify value in parameter. Add
fluid to the system if necessary
Optional Water Makeup valve
failure
Verify wiring between
controller and makeup valve.
Replace valve if necessary
Tank sensor failure
Replace sensor
Compressor Differential Pressure
Warning
31 W
Low discharge pressure or
high suction pressure
Contact customer service
Low Suction Pressure Warning 32 W
System low on refrigerant
Contact Customer Service
Liquid line valves closed
Verify wiring or output between
controller and valve
Chilled fluid setpoint too
close to freeze protection
setpoint.
Adjust setpoint or fluid
freezepoint temperature (will
require adding glycol to fluid)
Process fluid flow rate too
low.
Verify system valve operation
and adjust if necessary
Thermal expansion valve
failure.
Contact Customer Service
Pump Down Override Time
Expired
33 W
Liquid line valve open
Contact customer service
Hot gas bypass valve open
CC = Compressor Critical SC = System Critical PC = Process Critical W = Warning
Alarm Name
#
Type
Possible Cause
Solution
Pump Flow Sensor Failure 34 W Optional flow sensor failed
Verify wiring of flow sensor at
sensor and terminal block of
controller
Pump Pressure Sensor Failure 35 W
Sensor wires loose from
controller terminal block
Verify wiring of sensor at
sensor and terminal block of
controller
Sensor wires broke between
sensor and controller terminal
block.
Refrig Liquid Temp Sensor
Failure
36 W
Sensor wires loose from
controller terminal block
Verify wiring of sensor at
sensor and terminal block of
controller
Sensor wires broke between
sensor and controller terminal
block.
Refrig Suction Temp Sensor
Failure
37 W
Sensor wires loose from
controller terminal block
Verify wiring of sensor at
sensor and terminal block of
controller
Sensor wires broke between
sensor and controller terminal
block.
Tank Level Sensor Failure 38 W
Sensor wires loose from
controller terminal block
Verify wiring of sensor at
sensor and terminal block of
controller
Sensor wires broke between
sensor and controller terminal
block.
Water make-up failure 40 W
Make up solenoid failure
Verify wiring of solenoid valve
at valve and at terminal block.
Insufficient water pressure
Increase water pressure to be
above 5 psig (0.3 bar)