Testing the module needs to be carried out with caution because the only way of finding out whether it is functioning properly is to turn on the mains power and test the voltage coming into the device with a multimeter.

First, however, turn the power off. Check that the inside of the device is completely dry and there are no leaked fluids in the power entry module or elsewhere. If they are, then the device needs to be cleaned and dried before doing anything else.

When it is dry with the power still off, you need to gently slide the insulation covers off the wires coming out of the power entry module. Use a flathead screwdriver. This will reveal the terminals.

Now set the digital multimeter to test voltage. Plug the device in and make sure the power cable is well connected to the power entry module.

Now turn on the mains power. Carefully put one probe on the live terminal and the other on the neutral terminal. You should now get a reading corresponding to the country’s national grid voltage. So here it should show close to 220 volts.

If you are not getting a reading, it means the power entry module needs replacing. Turn off the mains power switch and disconnect the device. Next, disconnect the three wires that go from the terminals at the back of the power entry module.

Further into the machine, remove the screws to the power entry module. They are on the outside at the back of the device. Take out the power entry module, replace it with a new power module, and secure it with screws. Next, put the three wires on the terminals of the new modules, making sure that you put them in the right order.

Before you put back the insulation covers, test the module again. Plug it back in and turn on the main’s power. It should now show the correct main’s voltage when you touch the live and the neutral with the probes of the multimeter. Now turn the device back off and disconnect the mains. This allows you to safely put back the the insulation covers.

Finally, you can reconnect the device and try to turn it on. If it still does not work, then you have another fault somewhere else in the circuit, either in the switch or in the pump itself.