High
6A on Ideal Maximiser SE

Your boiler is failing to light the gas flame properly, meaning it cannot heat your water or radiators.

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

No ionisation after ignition phase, defective igniter / fan is not rotating / igniter and fan are functioning.

Shared across the Maximiser SE range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s 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 control system tries to start the burner but cannot detect a stable flame. It is usually caused by a blockage in the burners, a worn-out ignition spark, or a failed sensor that cannot 'see' the fire once it has lit. In some cases, it may also happen because the internal fan isn't spinning fast enough to clear out old gases and allow fresh air in for combustion.

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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Avoid the next call-out bill

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All 118 fault codes on the Maximiser SE

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

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