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Lelit PL041 "thunk" sound
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signal15
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Joined: 2 Jan 2006
Posts: 115
Location: Brooklyn Park
Expertise: I love coffee

Posted Sun Mar 4, 2012, 8:54pm
Subject: Lelit PL041 "thunk" sound
 

Sometimes when I'm steaming milk, I hear a metallic "thunk" sound, kind of like if you whack the bottom of a coffee can.  When this happens, the steam instantly starts coming out much stronger.  It doesn't do it all the time, probably a couple of times a week.  What could this be?

Is my boiler going to explode??  :)
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CN1
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Joined: 5 Aug 2012
Posts: 18
Location: Chicago, IL
Expertise: I love coffee

Posted Wed Apr 24, 2013, 9:17pm
Subject: Re: Lelit PL041 "thunk" sound
 

I just got a Lelit machine with the PID: Click Here (www.1st-line.com)

Overall, I'm pretty happy with the machine, but I have the same issue as you did--when I turn the steam on, I hear the "thunk" from time to time while the temp is increasing as well as during steaming.

Wondering if you ever found out what this might be. Please let me know if you did.

Thanks!
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steamer
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steamer
Joined: 11 Feb 2005
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Location: socal
Expertise: I live coffee

Espresso: Expobar Brewtus IV R
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Posted Thu Apr 25, 2013, 8:09am
Subject: Re: Lelit PL041 "thunk" sound
 

sounds like steam hammering, the rush of steam heading into dead end. Kind of like water hammering in pipes. The other option is metal expansion from heat.  Might be a sticky check valve.
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CN1
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Joined: 5 Aug 2012
Posts: 18
Location: Chicago, IL
Expertise: I love coffee

Posted Fri Apr 26, 2013, 7:09am
Subject: Re: Lelit PL041 "thunk" sound
 

So that's what the 1st Line tech guy said...that it might be metal expansion from heat. The question then is, does this pose any problems in terms of durability of the machine or how well the machine works? Should I be concerned or try to do something about this?
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