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weil-mclain out side temp

goat Member Posts: 6
  I have a weil- mclain ultra 105. I had to disconnect the outside temp sensor because the unit wouldn't turn on . Screen says outdoor temp none. Have checked all wires with a ohm meter and all is good any advice?


  • lchmb
    lchmb Member Posts: 2,997

    Did you ohm out the resistor also? I believe they give a list in the manual as to resistance in comparison to temp, is it in the area?
  • goat
    goat Member Posts: 6
    outside temp

    Thanks I'll try that tomorrow
  • MrDucks
    MrDucks Member Posts: 27

    When sensor fails boiler shuts down. You would think there would be a default temp so you dont freeze.
  • goat
    goat Member Posts: 6
    temp sensor

    Replaced outdoor temp sensor and reset system. It's all good Thanks to you all !!
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