Just in case anyone needs to know (and for my own reference if I ever want to go back to the original wiring), here is a schematic for the factory wiring in my UK Gaggia Baby Class coffee machine (PDF here):
Just in case anyone needs to know (and for my own reference if I ever want to go back to the original wiring), here is a schematic for the factory wiring in my UK Gaggia Baby Class coffee machine (PDF here):
Hi Tom- stumbling across this page as I’m looking for a schematic for wiring a circa ~2002 Gaggia baby. Replaced a broken switch And now trying to get it all working again. Mine has slightly different colours but looking for any support you might be able to provide on the topic. This is my model
https://www.amazon.com/Gaggia-11202-Espresso-Machine-Silver/product-reviews/B0001KO9T2
Cheers
Jacob
I don’t have a wiring diagram but it will be similar to the baby class. The major difference is whether you have a 110V or 220V version. The wiring tends to be complicated by the fact that Gaggia uses the boiler element to short circuit the heating indicator neon light. So when heating the light is off and when cooling it is on. Or, when at temperature it goes on. Voila! But it can be a head-scratcher working that out. What voltage are you on?
Oh, and some rudimentary boolean logic is done with the switches. e.g. the steam switch disables the solenoid.
Hi Tom,
what do you think is the purpose of the 100k resistor?
Man, I had to stare at that for quite a few minutes before working it out: it provides a path to mains neutral (blue wires) for the steam mode neon light (ST_LMP). This light will illuminate when the steam switch contacts 1 and 2 are open. This is not needed if the brew switch is also depressed but it is needed when that is not the case. It has to be a highish value resistor for the case when the steam switch is not depressed and contacts 1 and 2 are closed, at which point one end of the resistor is connected to mains live (orange wire).
thanks Tom, it’s sometimes not that obvious why it’s there for
Yeah, I agree.