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Contactor not energising with voltage present.

Ben Wallen

Hi there. I was called to an oven fault yesterday and found the circuit incorporated a contactor. I had voltage up to contactor but it would not energise and had no voltage leaving to the oven. 

I changed the contactor thinking it would sort the problem but it made no difference. 

In the top of the contactor where the supply sits there’s an mcb sitting in parallel which appears to feed a fire suppression pump mounted in the extractor hood. My thoughts were that perhaps this could be the issue but I don’t know enough about the suppression unit to test it. Anyway I would have still thought the contactor would pick regardless?

Any ideas would be gratefully received.

cheers

 

Ben 

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  • 0

    Have you got a photo of the bottom of the contactor?

    it looks like the mcb is for the control circuit and is fed from the live side of the contactor so you would need to follow the wire out of the bottom of the mcb which I would expect to go to whatever triggers the contactor and then make its way back to terminal A2.

  • 0 in reply to Sparkymark

    Thanks for your reply. The wire from the bottom of mcb goes in to the right hand flex and goes to a JB in the cooker hood where it’s connected to a fire suppression device.

    In the JB I did notice that a neutral from one cable was connected to an earth from the other cable. I checked the other hood for the oven that’s working fine and the wiring is exactly the same. 

    The fire suppression flex goes into what looks like a pump or canister. As I’m writing this I remember it being taped up where the cable enters and a bit of a kink in it. I didn’t know much about the device so I didn’t play with it. 

    Thanks again. 

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  • 0 in reply to Sparkymark

    Thanks for your reply. The wire from the bottom of mcb goes in to the right hand flex and goes to a JB in the cooker hood where it’s connected to a fire suppression device.

    In the JB I did notice that a neutral from one cable was connected to an earth from the other cable. I checked the other hood for the oven that’s working fine and the wiring is exactly the same. 

    The fire suppression flex goes into what looks like a pump or canister. As I’m writing this I remember it being taped up where the cable enters and a bit of a kink in it. I didn’t know much about the device so I didn’t play with it. 

    Thanks again. 

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