Posted by Kirk Grau on October 09, 2009 at 10:17:30 from (71.58.128.63):
Did not get right back to this from about a week ago, but thanks for the help.
Went down to the furnace and opened the junction box to follow power around and see if I could get it going myself. Found this circuit board. Could see voltage as stat called for heat and fan energized after appropriate time delay and stopped after heat signal was not present...so stat and fan are working as advertised.
Jumpered the T-T terminals on the burner and could force it to fire...so burner is working also.
That leaves this board so I call my friendly Trane service guy and he agrees to check price and availability for the board. Trane wants $320 for a $5 board. Go back down to the basement and get a Honeywell part number off the board and call local supply house and they have it on the shelf and it will only set me back $80.
Thought about "reverse engineering" the board since I had it narrowed down to either the stat relay that signals the burner or the limit control and going to Radio Shack for components and exercising the soldering iron. Wife just wanted heat though so I figured I was saving $240 on parts and whatever a service call might have been.
Replaced board and everything functions properly again.
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