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Problem Possible Cause Remedy
High refrigerant
pressure
Dirty air filters or condenser Clean filter or condenser
Air flow obstruction
Make sure chiller is installed in
accordance with recommendations in
High ambient air temperature
Ambient air temperature must be
reduced below 110°F
Condenser fan motor Replace if faulty
Condenser fan cycling control
Confirm proper operation, replace if
faulty
Refrigerant circuit overcharge
Contact refrigeration service
technician
High refrigerant pressure sensor Replace if faulty
Low water discharge
pressure
Pump running backwards Switch 2 legs of incoming power
Bypass opening too easily Adjust bypass valve
Pump failure Replace if faulty
Excessive flow thru bypass valve Adjust bypass valve
High water discharge
pressure
Bypass tightened too much Adjust bypass valve
Closed valves in process piping Open valves
Obstruction in piping or process Remove obstruction
Freezestat Freeze condition
Inspect the temperature control and
replace if faulty
Check pump flow and increase flow if
Deviating temperature
controller
Low coolant flow through the evaporator Adjust bypass valve
Intermittent overloading of chiller capacity
Check to make sure the chiller is
properly sized for the process load
Hot gas bypass valve
Contact refrigeration service
technician
Temperature controller failure Replace if faulty
Thermocouple Replace if faulty
Insufficient cooling
(temp rises above set-
point)
Process load too high
Check to make sure the chiller is
properly sized for the process load
Coolant flow through evaporator too high or too low Adjust bypass valve
Insufficient condenser cooling See High Refrigerant Pressure
Hot gas bypass valve stuck open
Contact refrigeration service
technician
Refrigerant circuit problem
Contact refrigeration service
technician
Temperature controller failure Replace if faulty
Thermocouple Replace if faulty
9.1 Low Refrigerant Check
Unfortunately, leaks happen. Opti Temp Inc. ships chillers all over the world and even with the best
testing and packaging a large shock is all it takes to create a leak. So if you think maybe your chiller
has lost its refrigerant, this guide will help you determine if it has or has not. There are two
components you will need to locate to determine whether the charge is correct.
1. The first is the controller. This will be the digital display that reads out the temperature
setpoint and the actual temperature. Generally this will be located on the front panel of the
chiller. Some units are equipped with either a remote control box or a master/slave
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