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A chiller may not work as well as a new one over time and its performance can degrade because of the lone use, even with a proper operation and regular maintenance. So what are common problems of a chiller and how to troubleshoot them? Let’s discuss it in the following.

Chiller Troubleshooting: Common Problems

Fault Cause


1. Switch on the power supply, the device doesn’t work. A. Power plug isn’t inserted.

B. Power socket has no power.

C. Power grid stops supplying power.

D. Fuse is burned.

A. Plug in the power plug.

B. Check socket.

C. Wait power supply.

D. Replace fuse.

2. Switch on the stirring

rotary knob, the stirrer

can’t rotate.

A. The rotary speed is too low.

B. Stirrer is stuck.

C. Stirring motor is broken.

D. Temperature is over 80℃,

making magnet loose magnetic force.

A. Increase the rotary speed of the motor

B. Put stirrer on proper place

C. Replace motor

D. Control temperature below 40℃

3. The display of the gauge is abnormal. A. Ligature is loose.

B. Platinum resistor turns off breaks or shorts circuit.

C. The instrument gauge has fault.

A. Check ligature

B. Replace platinum resistor

C. Check and repair the instrument gauge

4. The figures flash. A. Large power interference.

B. The instrument gauge has fault.

A. Remove interference, and use stable

power source

B. Check and repair instrument gauge

5. No heat A. Heat setting is lower.

B. Contactor is bad.

C. Heater is bad.

D. The instrument gauge has fault.

E. Ligature is loose.

A. Set it to needed value

B. Correct contactor

C. Replace heater

D. Check and repair instrument meter

E. Examine ligature

6. There has heat

all the time, without

temperature control.

A. Heat setting is higher.

B. The instrument gauge has fault.

A. Set it to needed value

B. Check and repair instrument meter

7. Shell of machine

has electricity.

A. Protective earthing is bad.

B. Other circuits fall off.

C. Insulating property of heater

is unsteady.

A. Joint protective earthing wire

B. Examine circuits

C. Replace heater

8. No refrigeration A. Didn’t turn on refrigeration switch

B. Condensate fan doesn’t rotate.

C. Compressor doesn’t start.

D. Freon leaks.

A. Turn on refrigeration switch

B. Replace fan

C. Examine circuits and compressor

D. Repair Freon after examine leak, and

then test machine

9. It has refrigeration,

But temperature

decreases slowly.

A. Freon leaks.

B. Condensate fan doesn’t run.

C. Magnetic stirring doesn’t run.

D. Capillary or circuit is blocked.

A. Turn on refrigeration switch

B. Replace fan

C. Examine circuits and compressor

D. Remove it by high-pressure nitrogen,

vacuumize after examination, make it full of Freon and test machine

10. Mechanical

stirring is can’t work.

A. Voltage transformation rectification

system is damaged.

B. Motor is damaged.

A. Examine and replace bad elements.

B. Replace motor

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