W-330: High TDS / conductivity

Q: How do I check a W-330 fault?

1. Check TDS reading 2. Verify blowdown valve operation 3. Check water treatment Safety: Boiler work must follow site permit-to-work; never bypass safety controls.

Probable causes

Insufficient blowdown
Feedwater quality problem

Step-by-step checks

Check TDS reading
Verify blowdown valve operation
Check water treatment

Safety: Boiler work must follow site permit-to-work; never bypass safety controls.

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

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Frequently asked questions

What does W-330 mean on a Steam Boiler?

W-330 usually indicates: High TDS / conductivity. Confirm the meaning in the manufacturer's manual for your model.

What causes W-330?

Insufficient blowdown; Feedwater quality problem.

How do I check a W-330 fault?

Work through the numbered checks above in order, recording readings as you go. Boiler work must follow site permit-to-work; never bypass safety controls.

Other Steam Boiler 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.