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Danfoss motorised valve failure

  • 15-10-2012 9:25pm
    #1
    Hedgecutter
    Registered Users, Registered Users 2 Posts: 1,041 ✭✭✭


    One of my Danfoss 2 way valves is giving trouble. It's closing but not switching off the boiler.
    Only 4 years old. Thought Danfoss was a good make.


Comments

  • #2
    freddyuk
    Registered Users, Registered Users 2 Posts: 1,111 ✭✭✭freddyuk


    It will be the micro switch. Cost about €2 and easily replaced if you can do a simple solder. Get a bag of them as these switches are the main cause of failure on a €70 valve. If you are not sure just take some photos as you dismantle the valve. It really is simple to do. Inside there is a motor, micro switch and toothed quadrant which needs to go back the same way it came out.


  • #3
    Hedgecutter
    Registered Users, Registered Users 2 Posts: 1,041 ✭✭✭Hedgecutter


    freddyuk wrote: »
    It will be the micro switch. Cost about €2 and easily replaced if you can do a simple solder. Get a bag of them as these switches are the main cause of failure on a €70 valve. If you are not sure just take some photos as you dismantle the valve. It really is simple to do. Inside there is a motor, micro switch and toothed quadrant which needs to go back the same way it came out.

    Where will I buy those switches. Use soldering everyday.

    Cheers.


  • #4
    freddyuk
    Registered Users, Registered Users 2 Posts: 1,111 ✭✭✭freddyuk


    Google. If you remove your old switch you can buy a direct replacement.There are various different designs so get one the same as you have. You can alter the valve by hand until it is repaired - I assume you have a separate actuator.


  • #5
    Hedgecutter
    Registered Users, Registered Users 2 Posts: 1,041 ✭✭✭Hedgecutter


    freddyuk wrote: »
    Google. If you remove your old switch you can buy a direct replacement.There are various different designs so get one the same as you have. You can alter the valve by hand until it is repaired - I assume you have a separate actuator.

    I have removed the actuator from the valve and opened the valve.
    I haven't looked inside the actuator yet, going to have a look tonight.
    Thanks for your help.


  • #6
    Hedgecutter
    Registered Users, Registered Users 2 Posts: 1,041 ✭✭✭Hedgecutter


    Hedgecutter wrote: »

    I have removed the actuator from the valve and opened the valve.
    I haven't looked inside the actuator yet, going to have a look tonight.
    Thanks for your help.

    Opened the actuator and took out the micro switch. Checked it with a multimeter and seems fine. Could it just have been stuck?


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  • #7
    DGOBS
    Hosted Moderators Posts: 3,496 ✭✭✭DGOBS


    did you check the actual voltage when the switch is closed? Checking continuity may not show you the issue at all (have had 180v before on them, bad neutral?)


  • #8
    Hedgecutter
    Registered Users, Registered Users 2 Posts: 1,041 ✭✭✭Hedgecutter


    DGOBS wrote: »
    did you check the actual voltage when the switch is closed? Checking continuity may not show you the issue at all (have had 180v before on them, bad neutral?)

    No I'm fairly limited in what I can do with a multi meter.
    To check voltage I turn it to 200 on v scale and take a reading?


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