Section 3 - Troubleshooting
3.1 Required
Maintenance
The refrigeration condenser fins are located just behind the front grill holes. Dust that accumulates will
reduce the amount of cooling power available. The dust should be blown out with a compressed air
hose. All other items are permanently lubricated and need no attention.
3.2
Problem & Solution chart
The following chart outlines a few problems that may arise. The solutions are listed in order of priority.
Problem
Solution
Does not run
12, 4
No cooling
6, 7, 1, 2, 4, 10, 8
Insufficient cooling power
3, 5, 7, 6, 10, 2, 4, 11, 8
Runs 5 minutes compressor shakes or stalls. Restarts 5 minutes later
5, 2, 1, 8, 4
Compressor will not start Clicks about every 30 seconds
1, 2, 4, 8
Gradual loss of cooling
3, 10, 11
Condenser fan not running or making loud noises
4
Fluid gets too cold
9
Stops cooling when fluid is cold
6, 7, 5, 10, 11
1.
Compressor may be cycling on overload. Shut off power for at least 10 min, then restart.
2.
Improper line voltage, frequency, or both. Insufficient power supply during starting. Check
voltage at power source during start cycle. Voltage must be within 10% of rated voltage. Avoid
extension cords that can cause voltage drops,
3.
See Sect. 3.1, Required Maintenance. Check for airflow exiting the back of the unit. Air vents
should not be closer than 3 in. from a wall, or unit placed inside a cabinet. Place where exiting
warm air will not return to the intake or near warm air from other sources. High room
temperature reduces Cooler's capacity.
4.
Unplug unit, remove cover. Check that condenser fan blade moves freely. If not, check fan
bracket or blade for misalignment.
5.
Fluid too hot for the Cooler to continuously cool. Check specifications for heat removal. At less
than O
°
C, heat loss to the room may be excessive. Containers and tubing should be insulated
where condensation or frost occur. High power pumps can introduce excessive heating.
6.
Fluid viscosity too high or freezing at desired temperature. Flow-Through units may freeze
internally and block the flow. Freezing point of fluid should be 10
°
C to 20
°
C lower than desired
temperature. See Sect. 2.3, Choice of Fluids.
7.
Insufficient fluid flow rate to provide cooling. Quick connectors or tubing less than 3/8 inch
diameter on Flow-Through models may restrict flow. Flow should be 3 to 15 liters/min.
8.
Compressor may be overcharged with refrigerant. If compressor does not start and all other
possibilities checked, compressor may be defective.
