ultra 105 weil mcclain no go

Tony_23

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 :)

robert borders

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