W-310: High stack temperature

Q: How do I check a W-310 fault?

1. Record stack temperature trend 2. Plan tube cleaning 3. Check flue-gas O2 Safety: Boiler work must follow site permit-to-work; never bypass safety controls.

Probable causes

Sooted fire tubes
Scale on water side
High excess air

Step-by-step checks

Record stack temperature trend
Plan tube cleaning
Check flue-gas O2

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-310 mean on a Steam Boiler?

W-310 usually indicates: High stack temperature. Confirm the meaning in the manufacturer's manual for your model.

What causes W-310?

Sooted fire tubes; Scale on water side; High excess air.

How do I check a W-310 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.