A Breville BES920 that beeps three times during warm-up may have its steam lever open. A flashing hot-water light during the same stage can mean the hot-water dial is open. Close the relevant control. The Dual Boiler manual describes both conditions as preventing the machine from reaching its ready state.
What was happening when it flashed?
The hot-water light has two meanings in this manual. During warm-up, check the dial position. During hot-water dispensing, the machine stops the flow after about 30 seconds and flashes the light. That second event is a dispensing limit, not the same startup warning. Return the dial to closed.
Keep the sequence in mind if you call for repair: power-on with the dial already open, or a light that appeared after water had been running. A short video of the controls can distinguish them without opening the housing.
The temperature display is separate again. A flashing temperature reading means the machine is heating, or that its temperature dropped substantially during use. Don’t combine all three observations into a report that says only “the light flashes.”
A warning that closing a control will not fix
E1, E2 and E3 belong to a different troubleshooting row. Breville says these errors cannot be reset by the user and directs the owner to support. A closed steam lever does not clear that instruction. Stop there rather than trying button combinations from another Breville model.
This guide applies to the BES920 Dual Boiler. An Oracle Touch or Barista Express has different controls, so its response needs its own instructions. If a BES920 still will not become ready with both controls closed, give the technician the exact display and what the machine did before it stopped.
For a BES920 that still will not warm up, request pickup and bench diagnosis. Include the model label and the startup sequence. Breville service terms explain the diagnostic deposit and collection process.
Reference: Breville Dual Boiler BES920XL Instruction Book, Issue G15, Alerts and Troubleshooting.