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A Faulty Water Pressure Board Repaired

By on March 27, 2021
A Faulty Water Pressure Board Repaired








A plumber brought this board for repair. I have worked on different water pressure boards but this one was the first time but I think all have the same repair concept.

how to fix water pressure board

The board is very clear about where to connect the AC in and where the AC out for the motor.

It is a 220 AC volt motor that we are dealing with here.

how to repair water pressure board

As it is shown here in the photo; the main fault is the 122 AC volt output. It is not enough output to run a 220 AC volt motor.

how to test relay

In such repair cases, I head for the capacitor but in this case, the capacitor was within its functional limit and no need to be changed. I tested almost everything on board but finally found out the fault. It was the relay on that board.

I soldered it off board, added 24 DC volts to its coil pins and tested out the connections, there was no continuity there which indicates a bad relay.

bad relay

Since I deal a lot with similar boards, I was able to find the same exact relay and replace the faulty one and…

testing water pressure board voltage

I was happy to read 220 AC volts on the output pins of the water pressure board. I called the customer and he was so happy to hear the good news because these boards are too expensive to buy.

That was a new experience for me. I never worked on this specific board before but the challenge was accepted and completed.

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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Note: You can check his previous repair articles in the link below:




  1. Parasuraman S

    March 27, 2021 at 3:35 pm

    Good fix there, dear friend! Device to back to work!

    • Waleed Rishmawi

      March 29, 2021 at 8:01 pm

      Parasuraman: thanks man. yes the machine is up and running. have a blessed day

  2. Albert van Bemmelen

    March 27, 2021 at 6:41 pm

    These troublesome mechanicle relays soon will be replaced by new solid state electronic relays. Recently again smaller SSR IC types were announed. DIl 8 and DIL 6 types are for instance available here

    • Waleed Rishmawi

      March 29, 2021 at 8:02 pm

      Albert: I have not encountered the new solid state electronic relays but looking forward to dealing with them. have a blessed day

  3. William Shaw

    March 28, 2021 at 12:43 am

    Mechanical relays can be troublesome but SCR are more difficult to diagnose. Nice job Waleed!

  4. Waleed Rishmawi

    March 29, 2021 at 8:03 pm

    William: I have not dealt with them yet so I am not sure what I am dealing with but looking forward to doing that hopefully soon. have a blessed day

  5. Yogesh Panchal

    March 31, 2021 at 4:35 pm

    Good Repair! waleed
    Testing relay on intermittent problem is very difficult job............

  6. Amir Mukhtar AShrafi

    April 1, 2021 at 12:33 pm

    Thank you Sir
    Well Done for Share your Valuable Expertise .
    Thanks also goes to Sir, Jestine yong.

    A Repairer and Student of Electronics

    My YouTube Channel" "
    Amir Mukhtar AShrafi

  7. Humberto

    April 2, 2021 at 12:00 am

    Anyway the PCB was fixed, and the customer saved money in a new PCB. Congratulations


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