Nine o'clock his morning I called US Boiler and got a tech expert. He had me use a voltmeter to diagnose. It's not the sensor- it's the control board. And it should be covered under warrantee- I just have to return the old one to them.
He also advised me that the "yellow chip" on the top of the board has to be placed back onto the new board. Reminds me of the "PROM" chip that Chevy used on the control board in my '81 Vette.
Supply House, where I bought the boiler, didn't have one in stock. Neither did my local Ferguson. The issue is that this is a specific board for high elevation installations. It was the same when I ordered the boiler from Supply House- this version wasn't in their catalog. I had to call them to order, and they had US Boiler make it and ship it directly to me.
I found one in stock at Midwest Supply. Shipping cost was either $19 ground, $35 2nd day, or $95 next day. Next day it is.
Trying to decide if I should order a second one just to have on the shelf.
