Low
E05 on Ariston Bravo 24 MFFI

Your boiler has detected that the water inside the system is getting too cold and has switched on its internal pump to keep the water moving and prevent freezing.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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.

Technical description

Anti-freeze system, pump only

DIY fix possible

Ensure power to the boiler remains switched onCheck that the gas supply is activeEnsure the system pressure is between 1.0 and 1.5 barKeep internal doors open if the boiler is in a particularly cold area like a garage

Find a Gas Safe engineer
Search the official register →

Related fault codes

E02View →

Related guides you might find useful

Banging / kettling / whistling noise

Each noise points to a different fault.

Read →

Yellow or orange flame — CO safety

Safety-critical — turn off, read this.

Read →

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →