Nespresso/Nescafé Dolce Gusto water pump functionality check

crwdns2936071:01crwdne2936071:0

Picture 1: Water pump from the Nescafe Nespresso, common and similar to the majority of models, thus the checking/testing using this pump can be used for any similar models.

crwdns2936071:02crwdne2936071:0

Water pump coil test, using a multimeter in the ohms scale, from 10-20 Mohms, depending on what the multimeter has.

crwdns2936071:03crwdne2936071:0

Reverse polarity measurement of the coil. In this black/red polarization, the multimeter should read "1" with no continuity. This is because the coil has an internal diode which prevents current from flowing inversely. This would be a false positive for a broken coil, but when switching around the polarization it reads perfectly fine.

crwdns2936071:04crwdne2936071:0

Repeat the tests using an automatic/autoscale multimeter. Yous will find that the readings might vary wildly.

crwdns2936071:05crwdne2936071:0

Pictures on detail of the measurement

crwdns2936071:06crwdne2936071:0

By changing direction of the probes we can see that, similarly to what happened in the first multimeter, we still do not get the measurement AUTO = open circuit.

crwdns2936071:07crwdne2936071:0

The multimeter reading has given us the correct measurement. Supplying the pump motor directly from mains power will not be necessary, but if you want to double-check it, you can try it.