Nespresso coffee maker (Invensys) water pump test

Water pump; in this document, we see it removed from the machine, but both outside and inside the coffee maker, we can test the water pump by powering it directly with a cable and 2 faston connectors, which is the first and most basic thing we have to check before powering it.

It is to verify that the pump operates at 230 V AC (voltage in Europe); in other countries, you have 110 V. This is indicated on the sticker on the housing.

We can check the pump coil with a multimeter on the ohms scale, starting at the 2M scale in one direction and then in the other direction; keep in mind that some water pumps have a thermal fuse in series with the winding. This fuse is generally visible; if you don't see it, it means there is no fuse and it is a simple coil.

Checking that the multimeter is working: The first thing we will do is, on the 2M ohms scale, touch the multimeter's test probes together to check that it measures 000.

Once this is done, we will check one of the two polarities (black on the left, red on the right). If the multimeter does not measure anything, we will proceed to check it the other way around.

The one in the example is faulty; it does not report any electrical resistance in the measurement.

Multimeter scale 2 M = 2,000,000 ohms full scale.

Just in case, we will also check the measurement on the 20 M scale. In this case, the pump is broken; it has a burnt-out, open coil, which is why it does not measure in either direction. It should be remembered that some water pumps have a thermal fuse directly attached to one of the poles; this specific model does not have one.

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