E-102: Motor overload

Q: How do I check a E-102 fault?

1. Check set pressure against rated pressure 2. Measure voltage and current on all phases (qualified electrician) 3. Inspect terminal tightness after isolation 4. Listen for bearing noise Safety: Isolate electrically and vent all stored air pressure before opening any part.

Probable causes

High system pressure setting
Low supply voltage or phase imbalance
Worn bearings
Loose terminals

Step-by-step checks

Check set pressure against rated pressure
Measure voltage and current on all phases (qualified electrician)
Inspect terminal tightness after isolation
Listen for bearing noise

Safety: Isolate electrically and vent all stored air pressure before opening any part.

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

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Frequently asked questions

What does E-102 mean on a Screw Air Compressor?

E-102 usually indicates: Motor overload. Confirm the meaning in the manufacturer's manual for your model.

What causes E-102?

High system pressure setting; Low supply voltage or phase imbalance; Worn bearings; Loose terminals.

How do I check a E-102 fault?

Work through the numbered checks above in order, recording readings as you go. Isolate electrically and vent all stored air pressure before opening any part.

Other Screw Air Compressor 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.