W-204: Oil separator dP high

Q: How do I check a W-204 fault?

1. Record separator dP trend 2. Check oil condition and service hours 3. Plan separator replacement per OEM interval Safety: Isolate electrically and vent all stored air pressure before opening any part.

Probable causes

Saturated separator element
Degraded oil
Carry-over from high temperature

Step-by-step checks

Record separator dP trend
Check oil condition and service hours
Plan separator replacement per OEM interval

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-204 mean on a Screw Air Compressor?

W-204 usually indicates: Oil separator dP high. Confirm the meaning in the manufacturer's manual for your model.

What causes W-204?

Saturated separator element; Degraded oil; Carry-over from high temperature.

How do I check a W-204 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.