How do I prime my machine for descaling?
Before initiating the descaling process, prepare by placing one Breville Descaling powder sachet into a liter of water and fill the tank with this solution. Press and hold 2-CUP button along with POWER button simultaneously until all lights including POWER, CLEAN/DESCALE indicator and HOT WATER/ STEAM light remain solid, indicating machine is ready for descaling (Page 24).
From the official Breville Breville Bes870xl A Barista Express Machine User manual, page 24
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