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lifestyle mid-position valve 679h340-30L0

Discussion in 'Plumbing and Central Heating' started by auztin100, 4 Feb 2009.

  1. auztin100

    auztin100

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    Hi there,

    Here's the problem with the above valve ...

    Basically everything was working fine ...
    We had a new kitchen installed, and during the installation the main hw/ch control timer unit was moved.

    Now the HW works fine (valve moves to correct position)
    CH doesn't work on its own (valve doesn't moe to correct position)
    when HW, and CH are both on all works (valve moves to correct position)

    could this be down to a wiring issue, or could something have blown the valve up ??

    Thanks for any help.

    Austin.
     
  2. D_Hailsham

    D_Hailsham

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    Did they run a new cable to the new programmer position? It should be a five core cable (plus earth).

    Check that there is a wire connected to the HW OFF terminal in the programmer. There should also be wires to CH ON and HW ON. The HW OFF wire connects to the same terminal as the Grey wire from the valve.
     
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  4. auztin100

    auztin100

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    Thanks, yep that all seems present and correct :confused:

    Sorry, yes, the cable was extended slightly ...
     
  5. auztin100

    auztin100

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    So could this be a problem with the valve? should I be able to manually move the switch to each position to test it ?

    Thanks.
     
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  7. MANDATE

    MANDATE

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    If you're talking about the lever on the side of the actuator, its purpose is to move the valve from HW (relaxed position) to mid position so both ports are half open. This is to prevent air locks when the system is filled after drain down. This lever can only be at the HW or mid positon. To the best of my knowledge you can not use it to reach CH position.
    If power is present on the 'grey' wire and valve does not move to CH, then the fault is within the actuator head.(unless the spindle is stiff)
    Likewise if the valve does move to CH and boiler does not light the fault will most likely be one of the micro switches within the actuator head
     
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