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Aquarium canister water sensor fault

Discussion in 'Troubleshooting and Repair' started by neil2014, Dec 3, 2014.

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  1. neil2014


    Dec 3, 2014
    Hi all looking for some advice

    My aquarium external filter has a water sensor that has an intermittent fault.

    The sensor switches off my internal heater if no water is present. The canister is full of water so there must be a fault with the sensor. The wiring to the sensor has three wires connected to the circuit board which are, V-W-G, on the photo it is the red-yellow-black wires.

    Would there be away to bypass the switch .

    thanks in advance
  2. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    Nov 28, 2011
    Hi Neil and welcome to Electronics Point :)

    There probably is a way to bypass that sensor, and you should definitely do that if you want to set your house on fire. Just make sure that your hack gets destroyed in the fire, otherwise your insurance company may refuse to pay out!

    Alternatively, post some photos of the switch and we'll see if we can all figure out how it works, and fix it.
  3. shrtrnd


    Jan 15, 2010
    Most of the aquarium problems like this I've had, are a result of corrosion on the sensor. If the sensor is in direct contact with the water, try cleaning it.
  4. neil2014


    Dec 3, 2014
    Hi all,

    Thanks for the replies.

    Sorry for the delayed response, the water sensor is shown below could it start a fire if there is always water in the canister.
    Unable to see any corrosion but i am not an expert.
    water sensor.jpg
    Last edited: Dec 5, 2014
  5. Bluejets


    Oct 5, 2014
    What Kris is saying, is if you start bypassing saftey cut out devices in any equipment there is a potential for disaster.
  6. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    Nov 28, 2011
    I don't know. But if you bypass it, the pump will try to run even when there isn't any water in the canister, right? And that's why the sensor is there, right?

    The proper attitude to safety isn't to say "OK, you show me how a problem could occur"; it's "I will show you how no problem can occur".

    Sorry, I can't tell anything about the water sensor from that photo. Perhaps shrtrnd can help with that.
  7. neil2014


    Dec 3, 2014
    The sensor is a safety feature to protect the inbuilt water heater from damage, if the filter is turned on and no water is present.

    Have you any idea what the connections V-W-G are on the circuit board, which each wire is connected to
    If it has gone faulty would this be a easy fix
  8. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    Nov 28, 2011
    All I can suggest is that G is ground. As I said, I have no experience with these things. Sounds like shrtrnd does though.
  9. chopnhack


    Apr 28, 2014
    Can W stand for the water heater element or the water sensor element?
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