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Gaggia Classic trips mains RCD


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After 6 years  of heavy service I retired my Gaggia Classic when saw smoke emerging from the switches and then found copious amounts of liquid and white salts inside the case.

It was still running though. I tore it down to individual component level and rebuilt the boiler then rethreaded the wiring exactly per my photographs. Happily, i have a standby classic available at all times for just such an eventuality.

I purchased a replacement switch. Sadly, when I plugged it in, the first thing that happened was that the pump started up, even the power and brew buttons were in the off position. I immediately thought it must be my switch wiring but it checks out with the wiring in the identical (working) machine. When I flipped the power switch on it immediately tripped my mains RCD.

Is it possible I messed up the heating elements in the boiler by immersing the boiler in acetic acid?

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I dunno, but i seem to remember reading something similar at sometime.

I think they cured it by drying the boiler out in an oven?

 

Google is your friend here!

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If you fully immersed the boiler the liquid gets drawn into the insulation around the heating elements causing a short circuit.

You need to completely dry out the heating elements, either by slow baking in an oven OR

look in Classic section for removing earth lead and switching on. YOU  ARE WORKING WITH 240 VOLTS  extreme caution required.

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On 20/07/2020 at 15:08, Blue_Cafe said:

I dunno, but i seem to remember reading something similar at sometime.

I think they cured it by drying the boiler out in an oven?

 

Google is your friend here!

Had exactly this problem myself after a recent clean.  Couldn't detect any short circuit with a multimeter but it kept tripping the RCD.  Drying the boiler out for an hour in a 100C oven cured the problem which I suspect was water trapped somewhere in the heating element. Don't forget to remove the group head and thermostats before baking. 

 

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OK thanks, i solved this by putting the boiler in an oven at 150c for an hour which sorted it out on a multimeter. 

The random pump startup was because I thought that the colour coding to the switch was all I need to do when in fact you have to precisely connect the cables irrespective of colour coding.

After cannibalizing another Gaggia machine for parts (switches, steam valve, boiler, steam knob, thermostat) I finally have a fully refurbed Classic, machine!

 

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