I've got my brand new GC for a couple of days and now I have a question: what happens if I turn all 3 switches ON with the steam knob CLOSED? I'm talking like 4-5 seconds max. Is it a usual backflush or is it something worse/damaging for the machine? I'm asking this cause I actually did this when I wanted to flush some water through the group head right after the steaming and I completely forgot to turn the middle switch off. I heard the pump noise going lower than usual, then noticed that there was no water coming out the grouphead, it all took around 5 seconds and I quickly turned it all off. I hope there's nothing to worry about, the machine functions ok after all. I'm still wondering, if there's anyone who came across the same situation, I'd appreciate your comments and opinion.
I have not done this but I really doubt you hurt anything. One switch is the main power, one is for brewing and one is to over ride the brew system for steaming and one is for turning the pump on for hot water. I think all you did is stall the pump with pressure which is why it got quiet, there was less room for the parts of the pump to move. Really though, if you grind too fine and choke the machine, you are pretty much doing the same thing, no damage when that happens.
You should be fine, relax. Short of running the machine out of water while having the heater on to heat the empty boiler when it should be full of water thus causing it to over heat and burn out, the machines are pretty tough. The above happens when you fail to fill the boiler after steaming, always fill the boiler after steaming and you should be OK :D
In real life, my name is Wayne P. Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!
Feed the newbs, starve the trolls and above all enjoy what you drink!
The steam switch on GC also affects the 3 way and blocks the group. That is a reason why you cannot use the steam switch to raise temperature while actually brewing. The OPV should handle that returning water to the tank. A few seconds should not harm anything. As Wayne noted, it is like a choked machine or using a blind basket for a backflush as far as the pump pressure is concerned. You do not have a hot water switch on GC. If you want hot water, open the wand and hit brew, not steam. You really cool the system to get hot water, not very effective on GC.
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