Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

ultra 105 weil mcclain no go

Tony_23
Tony_23 Member Posts: 1,033
All your molex plug connections. Had a gas valve unplugged once, lo'd the controller immediately.

If you changed the MCBA controller and that didn't do it, it wasn't the problem :)

Comments

  • robert borders
    robert borders Member Posts: 48
    need help tonite if possible 3 08 08 ultra 105 no go

    Talked to u guys couple weeks ago, about line size on domestic H. W. which i had at 3/4 to gold 80. you directed me to some sites which showed me 1 inch has twice the flow of 1 inch. changed that today and boiler no restart. put new board in and still no go. did tap the 1 inch with a tee and dropped the supply and return straight down. is that a problem. error code 03 says internal problem ,reset board and if no go, replace. on my way to home depote to get 50 gallon electric so wife can do her hair for tomoorows work. probably cheaper than multiple hotel rooms.

    i'll check back in couple of hrs to see if any response. 5:10 central time now.

    rb
This discussion has been closed.