Coffee machine tripping RCD - any ideas?

[Prawo Jazdy]

Hello,

I’ve had a Delonghi EC152 (basic espresso pump machine) for about 7-8 years. It has been used most days for that time, without any problems. A couple of days ago I plugged it in, and when I turned the switch at the socket on (with the machine set to ‘O’), the main circuit breaker tripped off. This happened again when I reset the CB.

I tried toasters and kettles in the same socket without issue. I moved the coffee machine to a different socket. This allowed me to turn on the socket switch without a problem, but turning the machine to ‘I’ tripped the CB again. I swapped fuses and had no joy. I’ve taken the boiler and innards out of the housing to poke around, and can’t see any damage or anything that looks like it has been sitting in water, or burning or anything.

Does anyone have any ideas for why it has suddenly stopped playing, and how I could test it other than what I’ve already done? I can take it to a repair shop, but they’ll spend up to £65 repairing it before they ask my permission, and it isn’t worth that spend. I’m handy enough to replace parts, but I’ve no idea how to work out what isn’t working or why. I have a basic multimeter if that’s any use for testing it.

Thanks for any suggestions. My late grandfather (an electrician) would not be impressed

Edited by Prawo Jazdy on Wednesday 24th October 14:25

[Prawo Jazdy]

Thanks for that both. I pulled out my multimeter to have a look... and discovered the battery had burst and was dead

At least I’ve found out that I’m not addicted to the stuff.

[Prawo Jazdy]

With a new battery in the meter, I measured off-scale resistance between all the plug pins. Earth pin to the boiler casing had good continuity. Resistance between the element contacts was 50 ohms, and between each element contact and the casing was off-scale. I don’t know if that helps me, but it seems normal to me.