E-302: Flame failure

Q: How do I check a E-302 fault?

1. Check fuel pressure 2. Inspect and clean flame sensor 3. Verify purge and ignition sequence Safety: Boiler work must follow site permit-to-work; never bypass safety controls.

Probable causes

Fouled flame sensor
Fuel supply interruption
Poor air/fuel ratio
Ignition fault

Step-by-step checks

Check fuel pressure
Inspect and clean flame sensor
Verify purge and ignition sequence

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 E-302 mean on a Steam Boiler?

E-302 usually indicates: Flame failure. Confirm the meaning in the manufacturer's manual for your model.

What causes E-302?

Fouled flame sensor; Fuel supply interruption; Poor air/fuel ratio; Ignition fault.

How do I check a E-302 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.