randytsuch Senior Member Joined: 11 Jun 2009 Posts: 578 Location: LA, Ca Expertise: I like coffee
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Posted Fri Aug 10, 2012, 12:39pm Subject: Re: Gaggia Classic boiler broken after visit from electrician
One other think to check are the coffee and steam thermostats.
These are items 4 and 5 in the diagram. If either one blew, then no heat. I would also think these, are the thermal fuse are more likely to blow out from 220V instead of the heating element.
If it heats when you turn on the steam switch, then the coffee thermostat is bad.
If you don't have 115VAC at the heating element, its likely either the fuse or the steam thermostat.
SJM Senior Member Joined: 17 Nov 2004 Posts: 1,508 Location: CA Expertise: I love coffee
Posted Fri Aug 10, 2012, 4:48pm Subject: Re: Gaggia Classic boiler broken after visit from electrician
tracerbullet Said:
Hmmm, I've replaced a fuse like that on my dad's Gaggia and only the boiler was out not the whole thing. The diagram does show that it should all be dead, but I'd still track down the power routing w/ a multimeter to be certain. This worked on his machine anyhow (it lit up and pumped water, but only pumped cold water). His was a "Coffee" not a Classic, these machines are darn similar inside but there may be a difference. .
I don't know the answer to this question as to the correct placement of the thermofuse in different models and/or how they are wired, but we do have wiring diagrams for both the Coffee and the Classic at the Gaggia Users Group that I probably already mentioned in this thread. (Sorry). And, it makes sense that the wiring especially at the front end of the circuit would be more complex on the Classic just because more things have to be activated when the power-on switch is thrown.
Oh, and of course, a multimeter will sort this out without having to look up much of anything....
toddst Senior Member Joined: 10 Aug 2012 Posts: 6 Location: Boston Expertise: I love coffee
Posted Wed Aug 15, 2012, 3:10pm Subject: Re: Gaggia Classic boiler broken after visit from electrician
Unfortunately, my friend knows less about tracing wires than I had hoped. So, I'm just going to have to wait for the electrician to come back next week to figure which part got fried.
tracerbullet Senior Member Joined: 13 Feb 2012 Posts: 152 Location: Saint Paul Expertise: I love coffee
Posted Sat Aug 18, 2012, 6:57am Subject: Re: Gaggia Classic boiler broken after visit from electrician
Good point on the thermoswitches. If I remember right they are closed when cold, and open when hot (when they trigger), that's how they cut the current from the heater elements once things are at the right temperature.
It's possible one of them is stuck open, thinking that things are up to temp when they are not? Does the light on the switch come on, that when things are working tells you it's at temp and ready to brew?
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