My furnace is acting screwy

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Gas valve

Gas valve

If this is not resolved already, have a gas tech. check the pressure through the main valve. I had a call for this early this spring. Manifold would light across all entries, hit the flame rod, stay lit for a second or two and call it quits. Flame rod was fine, but didn't get hot enough to send back a proper signal to keep the valve open.

Let us know how you make out:wink:
 
HAHA THE MOOSE said:
I know this is not a HVAC forum but I was hoping one of you knowledgeable tradesfolk would be able to help me out. I checked with other forums on the net (one's that claimed to be a HVAC forum but people post to it like twice a month). So anyway I have a Fridgidaire model # C3BA-030C-A. It was installed in 2002 and has been working fine (except for the blower wheel coming loose in 2006 which was such a pain in the A#$) until last winter when the flame sensor started giving me problems. Well I took it out and gave it a light sanding put it back in and just like that worked as good as new. Well this winter I started having a new problem (the furnace gave me a code which said "limit circuit open or external load on W") which was that the fan and the blower would turn on but the ignitor would not click on (light up). So the first thing I did was check voltage (line voltage connections first then low voltage) across the board which checked out ok. I then checked ever single limit switch on the furnace which checked out ok (continuity was all good). The last thing I did was to make sure the back side of the board was ok. I took a magnifying glass to it and looked for any soder points that looked bad. Well I saw 3 on the same 9 pin connector that didn't look like all the other. Instead of having a tip (sorta lookin like a nipple) it was indented (sorta like a donut). I took a sodering pen and filled in these three connections. When I put the board back on the furnace fired back up. Well that worked for a couple of days but now I have another problem. Everything seems to cycle fine up until the ignition. The ignitor glows hot, the flame starts but turns of in a second or two. So I guess what my long winded question is could this just be a bad board and i'm screwed or maybe the flame sensor has gone bad. I don't know how to check that. Its just one wire onto a metal piece that goes in-front of the burners. It should be 120v according to my schematic but I don't have any voltage on it, i'm thinking its just an intermittent voltage for when its actually sensing. Oh ya and I changed my t-stat. If anyone has any ideas that may help me solve this I would greatly appreciate it, because I am out of ideas. I'm am not experienced working with circuit boards and my HVAC skills are pretty limited, and if it is the board can I purchase a new one online and will it be identical port to port. Unfortunately I don't know any HVAC tech's well enough and the ones that I do work with to me seem for like installers rather then knowledgeable technicians.

Thanks for your time. Sorry this post was so long.
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Just one word of advice for when you post here.

Try hitting the enter button a few times so you can break up your loooooooooooooooooooooooonnnnng paragraph a bit. Its kind of hard to read when its one BIG block of words. Look at stickboys post, much easier to read.
 
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