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A water flow device repair. Model: Matic

By on July 28, 2017
fluke 112 true rms multimeter









This water flow device was brought to me by a plumper. This device is supposed to be connected to a water pump. When the level of the water inside the tank goes down, this device should trigger the water pump to come on by delivering 220 volts to it and it should start pumping water. For some reason, this was not happening.

flowpump repair

The common sense here before opening his device, is to check the motor. I applied 220 AC volts directly to the motor and it started running which gave me the indication that the motor is fine.

I took four screws out and here is what I saw inside the device. Not too complicated and it appears to be fine on the outside. I needed to investigate further.

fix flowpump

The two green connections you see on the board are for incoming AC power and the lower one is the outgoing AC power that goes to the water pump. I turned the device on and the green LED light came on indicating all is well so far.

how to repair flowpump

There is 220 AC going to the device and it should be 220 or more coming out so the water pump will work. I checked the voltage coming out of his device, I measure only, well, look at the photo and you will see.

fluke 112 true rms meter

That was not enough voltage to run the pump since that pump needed at least 220 AC volts to run. Other problem is I did not hear the relay click. I tapped on the relay and guess what happened, I could hear a click and here is the new reading.

how to fix flowpump

 The main problem was the actual relay on this device. Once I replaced the relay, and connected the water pump to it, it started to run. Mission accomplished.

This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.

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  1. Parasuraman

    July 28, 2017 at 9:02 am

    Excellent! A straight forward technical approach!

  2. Yogesh Panchal

    July 28, 2017 at 3:28 pm

    Good job! Waleed

  3. Albert van Bemmelen

    July 28, 2017 at 4:49 pm

    Professional repair Waleed! Thanks. Same thing can happen with relais in audio amplifiers acting as anti pop speaker protection circuits.

  4. Henrique Jorge Guimarães Ulbrich

    July 28, 2017 at 9:57 pm

    Good job, Waleed. Although there are today lots of devices with new technologies, I still enjoy electromechanical relays.

  5. Robert Calk

    July 28, 2017 at 11:03 pm

    Good job, Waleed.

  6. Kevin john

    July 29, 2017 at 10:16 pm

    Nice and great work boss!

  7. Mahmoud

    August 1, 2017 at 6:53 pm

    well done Mr waleed
    its great article thanks

  8. Rashed

    August 2, 2017 at 12:59 pm

    I have faced a problem in a tensile strength machine's Touch screen. when turn ON the power of Machine then the touch screen became hang that means it didn't work in any option of display. I replace it by anorher new one. Now how can repair this screen??

  9. Ezequiel

    May 17, 2020 at 6:43 am

    Hello! Just a few questions .Which is the relay on the image? Is it difficult to replace? Which is the procedure?

    Thank you!


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