High
E384 on Main Eco Compact Combi

Your boiler thinks a flame is present even when it should be off, causing it to shut down for safety.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

What the manual says

Manufacturer manual

False flame

From this model's manual
Verified against the Main/Main Eco Compact installation & service manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

What causes this fault?

This fault occurs when the boiler's internal sensors detect a flame signal even though the gas valve should be closed and the burner turned off. It is usually caused by a faulty sensing electrode sending a false signal or a control board malfunction that misinterprets electrical interference as a live flame.

This fault can sometimes be more common in damp or cold seasons, as high humidity or moisture ingress into the casing can cause electrical trackage and false readings on the circuit board.

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Related fault codes

All 71 fault codes on the Eco Compact Combi

Seeing a different code? Every code this model can display, in one place.

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