W-203: Air filter differential pressure high

Q: How do I check a W-203 fault?

1. Read filter dP on controller 2. Inspect and replace intake filter 3. Check room for dust sources Safety: Isolate electrically and vent all stored air pressure before opening any part.

Probable causes

Dirty intake filter
Dusty compressor room
Wrong filter element

Step-by-step checks

Read filter dP on controller
Inspect and replace intake filter
Check room for dust sources

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 W-203 mean on a Screw Air Compressor?

W-203 usually indicates: Air filter differential pressure high. Confirm the meaning in the manufacturer's manual for your model.

What causes W-203?

Dirty intake filter; Dusty compressor room; Wrong filter element.

How do I check a W-203 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.