Hi @“DavecUK” For a flush the steps I take are:
Bring the steam boiler up to temp & switch the machine off
Open the hot water tap & let the steam boiler empty into a dish until it stops hissing & close the hot water tap
Empty the water tank, wash & fill with zero water.
Switch on the machine, let the steam boiler fill & come up to temp then switch the machine off again.
Open the hot water tap again & let the boiler empty into a dish.
Switch the Steam Boiler off, switch the machine on & let the steam boiler fill with zero water again
Switch the machine off
Empty the water tank & refill with my brew water mix ready for when I next use the machine
I guess this isn’t a flush in the truest sense of the word more of a fill & pressurised drain but I thought it would be sufficient to clear out any sediment without taking a more invasive approach & disconnecting pipes
I usually have the steam boiler on once a day for a couple of hours max if I’m going to be making a flat white, the rest of the time if I’m just doing espresso I have the steam boiler turned off
The group was due a chemical backflush & cam lube, which I did this morning. I combined that with my annual check of all the group seals, valves & springs. Apart from a little tarnishing on the brass internals, which I was expecting; everything looked in good order & was clean as a whistle