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Group head water temp declining
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Discussions > Espresso > Machines > Group head water...  
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lttlscamp
Senior Member


Joined: 25 Dec 2009
Posts: 57
Location: Toronto
Expertise: I like coffee

Espresso: Rocket Giotto Evoluzione
Grinder: Baratza Vario
Posted Sat Jun 22, 2013, 10:21am
Subject: Re: Group head water temp declining
 

Well this is strange...

I went to the machine today and saw that the temp at the group head was sitting around 195 as its been doing since this problem started. So I pulled the lever to run the water and it barely got over 200 as usual.  I ran some steam for a few seconds and walked away to do something else.  When I came back about a half hour later the group head thermometer was reading around 206 like it used to always do after idling for a while.  When I pulled the lever the temp shot up to around 212 like it used to always do and stayed there for around 10 seconds before starting to come back down...just like it always used to do before I was having this under temp problem. And it'll been consistently working fine for the last few hours since then, holding around 202 during a shot.

So I don't really know what is going on.   The only thing I'd did differently was open the steam for about 20 seconds  and things seem to be back go normal now.   The odd thing is I'm sure I've used steam the other times I was seeing this under temp issue. But maybe I wasn't.  In any event I don't understand the connection if there is one.
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CoffeeRon
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Joined: 26 Apr 2009
Posts: 757
Location: Eatonville, Wa
Expertise: I love coffee

Espresso: Wega Lyra, Europiccola(still...
Grinder: Macap M7D, Pharos, Vario W,...
Vac Pot: Sunbeam CoffeeMaster
Drip: Melita BCM-4
Roaster: FR SR500,B-1600, SC/TO
Posted Sat Jun 22, 2013, 11:31am
Subject: Re: Group head water temp declining
 

Did you happen to hear the boiler fill kick in when you opened the steam valve?
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lttlscamp
Senior Member


Joined: 25 Dec 2009
Posts: 57
Location: Toronto
Expertise: I like coffee

Espresso: Rocket Giotto Evoluzione
Grinder: Baratza Vario
Posted Sat Jun 22, 2013, 3:59pm
Subject: Re: Group head water temp declining
 

I can't say for sure that it didn't but I don't think so.  It's hard to miss but I wasn't really paying attention.
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Freddo58
Senior Member


Joined: 16 May 2013
Posts: 36
Location: New Zealand
Expertise: Just starting

Posted Sun Jun 23, 2013, 4:08am
Subject: Re: Group head water temp declining
 

lttlscamp Said:

Well this is strange...

I went to the machine today and saw that the temp at the group head was sitting around 195 as its been doing since this problem started. So I pulled the lever to run the water and it barely got over 200 as usual.  I ran some steam for a few seconds and walked away to do something else.  When I came back about a half hour later the group head thermometer was reading around 206 like it used to always do after idling for a while.  When I pulled the lever the temp shot up to around 212 like it used to always do and stayed there for around 10 seconds before starting to come back down...just like it always used to do before I was having this under temp problem. And it'll been consistently working fine for the last few hours since then, holding around 202 during a shot.

So I don't really know what is going on.   The only thing I'd did differently was open the steam for about 20 seconds  and things seem to be back go normal now.   The odd thing is I'm sure I've used steam the other times I was seeing this under temp issue. But maybe I wasn't.  In any event I don't understand the connection if there is one.

Posted June 22, 2013 link

As I said earlier - "There's a vacuum breaker, so it's very unlikely that there could be a problem from air in the boiler, but if you wanted to check this then run some steam for a while, then monitor temperature and see if it rises."
That's behaving like there's air in the boiler which isn't getting vented out  - you're purging the air/steam mixture when opening the steam valve, so then boiler temperature rises to normal once you're not getting that "false pressure" from a steam/air mixture actuating the pressurestat.
Vacuum breaker valve could be stuck closed.  You can possibly check it by tapping the pin on the valve (take care as it will vent steam if the boiler is hot).  The valve might just need a clean out - or a new one only costs $12 or so.
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lttlscamp
Senior Member


Joined: 25 Dec 2009
Posts: 57
Location: Toronto
Expertise: I like coffee

Espresso: Rocket Giotto Evoluzione
Grinder: Baratza Vario
Posted Sun Jun 23, 2013, 4:22am
Subject: Re: Group head water temp declining
 

Yep, I've already replaced it once. I'll let it cool down and then turn it back on.  If the vac breaker is doing something funny I should be able to tell because I can clearly hear it release air and the close when it's warming up.  And it hasn't happened again

Thanks again for the help!
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