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low water cutoff

Jorge
Jorge Member Posts: 26
in THE MAIN WALL
It`s on a mc lane hot water boiler cga5. Just put it in last week in my home. It was working ok all week then today the red light went on. I checked the wiring and the water in the system and it`s all ok. I jumped out the cut off and ran the boiler all ok. It seems that when the boiler heats up the red light goes out so I tried bleading the system there was on air in the system.

Comments

  • Jorge
    Jorge Member Posts: 26
    low water cutoff

    Any one have a problem with a 24 volt guard dog low water cutoff saying that the water was low when it was ok.
  • Dave_103
    Dave_103 Member Posts: 8
    Rich.............

    new one on me, what`s it on?
  • Jorge
    Jorge Member Posts: 26


    It`s on a mc lane hot water boiler cga5. Just put it in last week in my home. It was working ok all week then today the red light went on. I checked the wiring and the water in the system and it`s all ok. I jumped out the cut off and ran the boiler all ok. It seems that when the boiler heats up the red light goes out so I tried bleading the system there was no air in the system.
  • Ron Schroeder
    Ron Schroeder Member Posts: 998
    Rich

    Did you mount it in a Horizontal pipe if so and that pipe gets air in it the LWCO will woark and shut down the system, I always mount in a vertical pipe and try for the suppy side.
  • Jorge
    Jorge Member Posts: 26


    No it is vertical. It is in the outle side of the boiler. First is the guage then the lwco then a ball valve and 1 foot of pipe then a 90 elbow to a honeywell air trap then to the two zone valves.

    see pics
  • Al Corelli_2
    Al Corelli_2 Member Posts: 395
    LWCO

    Did you put it in with teflon tape?
    Is the green ground wire attached?

    To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

    There was an error rendering this rich post.

  • Jorge
    Jorge Member Posts: 26


    Yes it said to use teflon tape and the ground wire is grounded to the transformer box inside the boiler. I tryed putting the ground wire on the pipe it did not work.
  • Unknown
    Unknown
    Rich, just a guess.............

    what`s that, on 1" pipe?, maybe its screwed-in too far and "shorting-itself-out" against the body of the fitting?
  • Ron Schroeder
    Ron Schroeder Member Posts: 998
    Not sure about the Guard Dog

    but my brothers unit ran for months and one day it wouldn't start Friday at four pm we get he call, I go over and no power out of the safeguard LWCO I looked inside the control and the installer never hoked up the white wire to the post, they just rested it there and bing no power once it moved enough.
  • Steverino
    Steverino Member Posts: 140
    Maybe this will help...

  • Steverino
    Steverino Member Posts: 140
    Maybe this will help...

    below is a link to a W/M .pdf file that pertains to the RB-24 LWCO:

    http://www.weil-mclain.com/contractor/TechServiceBulletins/sb0302.pdf
  • Unknown
    Unknown
    check your grounds

    Backfedd on a ground or lack of a good ground on the system will cause this
  • Jorge
    Jorge Member Posts: 26
    water hammer

    I have water hammer whenever the zone valves shut. They are honeywell zone valves and they are mounted on the feed side of the boiler.
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