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Discuss Drayton LP241 timers in a strange state in the Plumbing Forum area at UKPlumbersForums.co.uk.

  1. Jon Weaver

    Jon Weaver New Member

    My CH/HW is controlled with a Drayton LP241 (Which is rebranded as Iflo as I replaced it a few years back due to a fault).

    Its been fine for years but last weekend I 'boosted' the water and the boiler didn't fire.. I then looked (listened actually) to the programmer and it was acting strange...

    Yesturday I remove it and set it up on a bench just to prove that it was acting strange and its the same... Let me try to explain the behavour.

    So start with both CH and HW in timed mode but off.

    1. Press HW (on) - Click
    2. Press HW (off) - Click
    3. Press (CW) (on) - No Click
    4. Press HW (on) - Click
    5. Press HW (off) - No click
    6. Press (CW) (Off) - Click

    it seems that the behavour of HW is "locked" to CH in some way.. HW will only work when CH is off.. But also, CH will only come on, when HW comes on. Its a very odd condition and this is new.. nothing has changed.. it worked perfectly before.

    Today I went to a neighbours to check their original LP241 (just to confirm, I wasn't going mad) and it works as I expected (ie 2 independant channels) which turn on and off (click) when you press either the HW or CH buttons.

    This stinks of software, rather than hardware and I wonder if anyone has seen anything like this before and has any thoughts as to how to fix it... Is there any kind of "factory reset" (I read you can press/hold SET and + but for me it doesn't reset anything).. I hjave even contemplated removing the internal battery to try and clear the condition.

    Thanks in advance for any thoughts

    Jon
     
  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Could be an internal fault relay stuck open etc

    Bench test it supply 240 to it and go through it

    Eg have light bulbs for heating and hot water or use a multi meter

    Warning things will be live so if you don't know what your doing don't do it

    Most likely to be the prog at fault
     
  3. Jon Weaver

    Jon Weaver New Member

    Done exactly that.. But used a multi-meter to verify the voltages rather than bulbs.. And the behavior is as described above.

    I can't see how its a stuck relay as the behavior is the same every time.. Its following a new logic pattern which is constant..
     
  4. Jon Weaver

    Jon Weaver New Member

    I have created a video to show the issue... Basically, when the CH is on, the HW relay does not click

     
  5. Jon Weaver

    Jon Weaver New Member

    I have made an observation regarding the jumper.. If I move it to "G" the behavior changes and both HW and CH come on together, so I know moving the jumper does something

    But if I take the jumper off, it behaves in the same way as it does in 'P' mode.. So i am starting to think that there is a hardware fault and its simply not detecting the jumper...
     
  6. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    jumper sets it to single channel
     
  7. Murdoch

    Murdoch Active Member

    Buy a new one, they do go wrong, but easy to fit a new one .
     
  8. Jon Weaver

    Jon Weaver New Member

    Exactly what I am in the process of doing.. But just wanted to be 100% sure mine was actually faulty first..
     
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