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ULTRA BOILER HIGH LIMIT LOCKOUT

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rdk
rdk Member Posts: 2
in THE MAIN WALL
HAVE A WEIL MCLAIN ULTRA 3 LP GAS BOILER THAT PERIODICALLY GOES INTO A HIGH LIMIT LOCKOUT. COULD BE ONCE A WEEK OR ONCE A MONTH. UPPER TEMP SENSOR AND LOW VOLTAGE HARNESS HAVE BOTH BEEN REPLACED. MAIN CONTROL HAS ALSO BEEN REPLACED DO TO ITS FAILURE. THE FACTORY SUPPLIED CIRCULATOR AND THE E-Z MANIFOLD ARE INSTALLED SO THERE IS PROPER FLOW THROUGH THE BOILER. THIS IS A MULTIPLE ZONE SYSTEM WITH NO SMALL ZONES. TWO ARE BASEBOARD WITH AT LEAST 20 FT. ELEMENT AND THE OTHERS ARE RADIANT IN FLOOR WITH NO UNDER FLOOR INSULATION. LOOKING FOR POSSIBLE ANSWERS TO PROBLEM.

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  • kcopp
    kcopp Member Posts: 4,432
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    What is the model? What is the primary circ? I have had issues w/ 0014's on 155 ultras.
    Could very well be a piping and/or air issue.
  • rdk
    rdk Member Posts: 2
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    model 155 with a 0014 circulator with weil's e-z manifold
  • kcopp
    kcopp Member Posts: 4,432
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    is the 0014 shot? How old?
  • Paul48
    Paul48 Member Posts: 4,469
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    Can you post some pictures of the boiler, at a distance, so we can see the piping?

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