W-502: Low feed air pressure

Q: How do I check a W-502 fault?

1. Check inlet pressure gauge 2. Inspect pre-filters 3. Leak-test feed line Safety: Nitrogen is an asphyxiant; check oxygen levels before entering enclosed spaces.

Probable causes

Compressor capacity
Blocked filters
Leaks

Step-by-step checks

Check inlet pressure gauge
Inspect pre-filters
Leak-test feed line

Safety: Nitrogen is an asphyxiant; check oxygen levels before entering enclosed spaces.

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

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Frequently asked questions

What does W-502 mean on a Nitrogen Generator?

W-502 usually indicates: Low feed air pressure. Confirm the meaning in the manufacturer's manual for your model.

What causes W-502?

Compressor capacity; Blocked filters; Leaks.

How do I check a W-502 fault?

Work through the numbered checks above in order, recording readings as you go. Nitrogen is an asphyxiant; check oxygen levels before entering enclosed spaces.

Other Nitrogen Generator 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.