Low
E38 on Ariston Egis 24 MFFI

Your boiler has locked itself out because the reset button was pressed too many times in a short period.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

What the manual says

Manufacturer manual

Reset pressed 5 times within 15 minutes

From this model's manual
Verified against the Ariston Bravo 24 Mffi installation & service manual, page 56.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

Turn the boiler power off at the fused spur switch (the wall switch).Wait for at least 5 to 10 minutes to allow the internal memory to clear.Turn the power back on and wait for the boiler to initialize without pressing any buttons.

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