Beretta Diverter Valve Passing / Cross-Flow

Radiators get hot when only hot water is being used, even with heating turned off.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Worn diverter valve seals, Debris preventing full closure, Faulty diverter motor not returning to DHW position, Incorrect installation of bypass

Safety: Pipework may be hot; use caution.

Confirm settings: Ensure the heating is turned off at the programmer and room thermostat.
Observe boiler display: Check if the Beretta boiler indicates CH demand when only DHW is used; this suggests diverter or control issues.
Technician – inspect diverter valve: Remove and examine the diverter valve for wear or debris. Replace seals or the complete valve as needed.
Check bypass arrangement: Ensure any automatic bypass valve is correctly set and not causing unwanted circulation.

Hard 4/5

Diverter Valve Assembly

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