E-202: Low evaporator pressure

Q: How do I check a E-202 fault?

1. Check chilled-water flow and strainer 2. Record suction pressure and superheat 3. Arrange qualified leak check Safety: Refrigerant work requires certified technicians; isolate power before panel access.

Probable causes

Low refrigerant charge
Low chilled-water flow
Expansion valve fault

Step-by-step checks

Check chilled-water flow and strainer
Record suction pressure and superheat
Arrange qualified leak check

Safety: Refrigerant work requires certified technicians; isolate power before panel access.

Sample code — verify with the OEM manual for your exact model.

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Frequently asked questions

What does E-202 mean on a Chiller?

E-202 usually indicates: Low evaporator pressure. Confirm the meaning in the manufacturer's manual for your model.

What causes E-202?

Low refrigerant charge; Low chilled-water flow; Expansion valve fault.

How do I check a E-202 fault?

Work through the numbered checks above in order, recording readings as you go. Refrigerant work requires certified technicians; isolate power before panel access.

Other Chiller codes

Disclaimer: Fault code information is guidance only. Codes and meanings vary between manufacturers and models — always follow the manufacturer's manual and your site's safety procedures, and use qualified personnel for electrical, pressure, refrigerant and combustion work.