How much does it cost to fix Biasi error code A short pulse every 4 seconds?

Typical repair cost for the Biasi A short pulse every 4 seconds fault is £0 including labour.

A short pulse every 4 seconds Low

Biasi A short pulse every 4 seconds Fault Code

Q: What does the Biasi A short pulse every 4 seconds fault code mean?

Your boiler is working correctly and is simply in standby mode while its built-in protection prevents the internal pipes from freezing.

Also written as ASHORTPULSEEVERY4SECONDS — same fault.

The Biasi A short pulse every 4 seconds fault code means: your boiler is working correctly and is simply in standby mode while its built-in protection prevents the internal pipes from freezing.. It appears on 4 Biasi models in our database.

Technical description: Boiler in stand-by condition. Anti-freeze system active.

Typical repair cost £0 (including labour)

DIY fix possible

No action is required as this is a normal status message.Ensure your gas and electricity supplies are left on during cold weather.The light will stop pulsing once the boiler temperature rises or you turn on your heating.

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Biasi models that show the A short pulse every 4 seconds fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Biasi A short pulse every 4 seconds fault code information on this page is sourced and cross-checked against the official Biasi service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026