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Old 11-13-2015, 06:51 AM   #11
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KyDan's Avatar
Join Date: Mar 2008
Location: Louisville, KY
Posts: 7,133
Please post the make and model # of your furnace.
It very likely does NOT have a thermocouple.
It probably has a flame sensor which is not the same.
Modern LP furnaces and water heaters and even LP refrigerators have
flame sensing technology which does not use a thermocouple.

IF it's lighting only sporadically and then not staying lit once it does light the
control board is suspect. You can try polishing the spark electrode with
extra fine sandpaper and make sure any push on connectors going to/from
the board are tight (pull them off and replace them a few times to help make
sure they are not corroded at the plug).

Dinosaur boards are highly regarded as better than new and usually a bit
cheaper than original. I had to put one in my last rig after my furnace exhibited
pretty much the same symptoms you say you are having.

Dan & Rita D
2017 Nissan Titan 5.6L King cab 4wd
1999 Suzuki Intruder Motorcycle
Blue Ox WD hitch

Camping days 2010-53, 2011-47, 2012-41,
2013-41, 2014-31, 2015-40, 2016-44, 2017-63, 2018-30
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Old 11-13-2015, 09:38 AM   #12
Join Date: Sep 2012
Location: CA
Posts: 342
Yep going to need a model# and then a wire diagram and/or schematic.
I never leave home with out them, for each major appliance. I hope not to need them but they sure are a life saver when you do need them.
Doing some thinking and it could be a bad or sticky solenoid too.
Its hard to diagnose stuff from a distance but its just a puzzle one piece at a time tell one is missing/bad.
Good Luck

2011 Wildwood T26BHXL
2004 Yukon XL Denali
43yrs of camping; one lucky guy
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Old 11-13-2015, 09:55 AM   #13
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Join Date: Feb 2015
Location: in my new 29hfsxlr
Posts: 1,658
Originally Posted by dandr614 View Post
Is there a generic part number for this suburban thermocouple?
x2 on the flame sensor . but do not polish, a very slight cleaning will do . one does not want to take sand paper to it and polish it so much as a very lite and simple clean a couple stroke will do . the sensors will get carboned up and not sense flame and causes what you are experiencing
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Old 11-13-2015, 02:37 PM   #14
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Join Date: Oct 2015
Posts: 14
Thanks all I will pull the control board as soon as I return. Luckily it has not gotten real cold yet and my ceramic heater seems to be working well enough for the time being.

Rich Wallen
2012 31' Flagstaff Classic BH
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