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Old 05-15-2014, 08:51 AM   #11
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Join Date: Jun 2013
Posts: 10
Is there any certain thing I should look for in trying to find where this circuit board is.

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Old 05-15-2014, 09:48 AM   #12
Join Date: Dec 2013
Posts: 50
In my new to me Surveyor, I noticed that the furnace would run when it was cold enough in the trailer even though the thermostat was set to off. I found that there is a tab on the temperature slide that is supposed to separate two contacts when in the off position. The separation wasn't happening. I added a small blob of superglue to the tab which was enough to separate the tabs.

2007 Surveyor SV 230
2013 F150 Ecoboost
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Old 05-15-2014, 09:54 AM   #13
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It runs hot,cold, thermostat unhooked, no matter what. The only way it will stop is if I pull fuse
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Old 05-15-2014, 03:04 PM   #14
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Join Date: Oct 2013
Location: Georgetown, TX
Posts: 276
The board I found was in the cavity inside under the air conditioning cover - this was a nonducted unit.

Based on the every I wiring diagram I see the +12VDC to the fan motor passes through the time delay relay which is controlled by the circuit board. The circuit board triggers the time delay to purge the furnace before ignition. This time delay circuit is the [COLOR="black"]only[/COLOR] way the blower gets power.

I realized you have replaced all of this but it has to be a defective circuit board or a stuck time delay. This would be true even if you have a second relay in the air conditioner. It would only trigger the furnace circuit board and the time delay.

If you can get to the furnace look for the two small wires in the loom with the 12DVC wires (usually blue) to and from the thermostat. If possible I would disconnect them, at the furnace, which will totally eliminate the the thermostat and the wires to and from. If somewhere these two wires are touching they are completing the circuit just as the thermostat would.
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Old 05-15-2014, 03:14 PM   #15
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Ok. I'll give that a try when I get a chance. Thanks for the help
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Old 05-18-2014, 09:42 AM   #16
Join Date: Sep 2012
Location: CA
Posts: 342
Never had an issue like this but……
Your problem could be a short: have you put any screws through the wall(hanging a picture)…or could wires have gotten pitched together from a slide. An easy check would be to disconnect the wires from thermostat and see if the signal wire has constant power(with fuse for furnace installed). Or a better check would be at the circuit board to see if it is constantly getting a signal(power)to run. If there is no short you should be able to eliminate that part of system.
Boards can come bad and it can be a headache wanting to believe it can’t be bad.
My mom would say, “it’s a ground problem”. Over the years she has seen my dad and I chase so many electrical issues that turned out to be a ground issue. Mom is right more times than not.
For me, when trying to chase electrical issues, I slow down and think of the system. I get as much paperwork as I can(schematic, wire diagram, trouble shouting from manual, warranty, and manufactures phone number for technical issues…..) and then start chasing.
This forum is a great source of personal experience but might go straight to calling the manufactures technical support. These guys are usually very nice and can give a direction to look.
Good luck

2011 Wildwood T26BHXL
2004 Yukon XL Denali
43yrs of camping; one lucky guy
YoungKopernik is offline   Reply With Quote

fan, furnace

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