Boiler displays A25, pump runs but burner does not fire, may indicate anti-freeze or anti-block cycle.

Safety: Ensure the property is protected from freezing conditions.

• Check room temperature: If the area is very cold, the boiler may be running frost protection. Allow it to complete its cycle.
• Verify settings: Ensure the Beretta boiler is not set to summer mode if heating is required.
• Monitor operation: If A25 persists and no heating occurs, a sensor or PCB fault may be mis-triggering frost mode.
• Technician – diagnostics: Check NTC readings and PCB logic via service mode and replace faulty components as needed.