by HughF » Tue Aug 29, 2006 6:23 pm
If you are worried about overheating, most HX machines need a cooling flush (aka "blank shots") pulling if water has sat in the HX (machine not pulling a shot) for more than 3 to 4 minutes, sometimes 6 to 8 fluid ounces. My machine isn't HX so someone else can say more about this. If you pull a shot of 4 fluid ounces (or the size of 2 doubles) with no PF in place at the same delay after your previous shot as normal, does the water steam or bubble on exit? Can you try pulling the shot just after a "blank" shot like this and see if it helps?
If it helps, try different length blank shots before each real shot and see which works best.
Cheers,
Hugh
Grinders : Macap MXK conical for espresso, Mahlkoenig Vario for Chemex, Macap MC6 (spare when our office was closed) for cafetiere, Zassenhaus Knee Mill for cafetiere when working away from home.
La Spaziale Vivaldi S1 espresso machine. HotTop KN8828P roaster. Chemex manual drip for most brewed coffee plus cafetieres and eSantos.