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09-06-2016, 11:53 AM
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#1
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Junior Member
Join Date: Sep 2016
Posts: 8
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Suburban furnace will not operate.
Hi, I have a Wildwood X-lite 28' travel trailer and I am recently having problems with the propane furnace. It is a Suburban SF-30FQ S/N 134403003 furnace that will not start. The thermostat is a Dometic single zone LCD that runs both the furnace and A/C. When I turn the thermostat on to furnace I can a click in the Roof top A/C unit and in the furnace as well. Power seems to be getting to the furnace but does not go to the blower or ignition. Any help would be appreciated. Thanks.
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09-06-2016, 03:12 PM
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#2
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Site Team
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 9,850
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Has the furnace ever worked?
have you checked the fuses?
How did you determine that power 'seems' to be going to the furnace?
If it's never worked it could be that the switch in the furnace is off.
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
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09-06-2016, 06:20 PM
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#3
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Junior Member
Join Date: Sep 2016
Posts: 8
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Hi, The furnace worked fine last month and I did check the fuse which was fine. When I was checking for power around the switch at the furnace I accidentally crossed 2 wires which blew the fuse. So power is getting to the furnace.
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09-06-2016, 06:33 PM
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#4
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Site Team
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 9,850
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Did you connect the thermostat wires together to see if that would run it?
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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09-06-2016, 07:46 PM
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#5
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Junior Member
Join Date: Sep 2016
Posts: 8
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No I did not try this. Just tie together the 2 thermostat wires from the furnace. They are the smaller wires (I believe blue in colour) will this make it run all the time and will it ignite the burner?
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09-06-2016, 07:57 PM
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#6
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Cyber Phrenologist
Join Date: Jun 2007
Location: Southern Crescent
Posts: 1,806
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I love furnace threads as mine has NEVER worked right. Carry on!
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2008 (or is it 2009?) Rockwood 8280SS - 2022 F-250 7.3L
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09-07-2016, 09:43 AM
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#7
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Site Team
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 9,850
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Quote:
Originally Posted by gregk
No I did not try this. Just tie together the 2 thermostat wires from the furnace. They are the smaller wires (I believe blue in colour) will this make it run all the time and will it ignite the burner?
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Yes they are blue. All the control board in the A/C does is connect them together thru a relay to get the furnace to run.
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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09-07-2016, 05:43 PM
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#8
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Junior Member
Join Date: Sep 2016
Posts: 8
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Hi, I tied the thermostat wires together with the same result. All I here is a click but nothing. At least we can rule out the thermostat.
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09-08-2016, 10:18 AM
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#9
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Site Team
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 9,850
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That's what I was going for. Seeing if it was the furnace or the thermostat.
Now that you've narrowed it to the furnace, you can concentrate on that.
Since you're hearing a click it's getting power to the time delay relay. I assume that's what you hear clicking. But the blower motor isn't running, right?
If you can access the blower motor, I'd hook 12 volts to it directly and see if it runs. If it does, then it leads to the relay/control board.
__________________
Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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09-08-2016, 11:28 AM
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#10
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Junior Member
Join Date: Sep 2016
Posts: 8
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Yes, the clicking sound is the time delay relay on the circuit board getting power. The blower did not come on at anytime (even when I bypassed the thermostat). I will see if I can access the blower wires and try that. Not much room to work in.
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09-08-2016, 12:24 PM
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#11
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Site Team
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 9,850
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Good luck. They don't give you much room in those things and you don't want to pull it out unless you have to.
__________________
Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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09-08-2016, 07:46 PM
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#12
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Junior Member
Join Date: Sep 2016
Posts: 8
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Hi, I tried to get at the wires for the blower but as I was doing this I touched the time delay relay for the ignitor for the burner and it fell off the module board. So it appears that I need a new board. For what it is worth the blower fan does move freely in the housing. By the way the board is not fastened very well to the furnace it just slides on to the side. For something so vital to the operation of the furnace it just hangs there.
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09-08-2016, 08:15 PM
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#13
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Senior Member
Join Date: Feb 2013
Location: Chagrin Falls, Ohio
Posts: 3,225
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Don't overlook the obvious, is your battery charged? You need 12v for ignition. Also, is your propane full and turned on?
What year is your model?
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2011 Coachmen Freedom Express 295RLDS- Sold
2015 F-250 FX4
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09-09-2016, 07:30 AM
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#14
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Junior Member
Join Date: Sep 2016
Posts: 8
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Hi, Battery is charges and I am plugged in to a 120volt AC power supply, propane is turned on and full. The trailer is a 2012 Wildwood X-Lite and the model of the Furnace is a Suburban SF-30FQ.
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09-09-2016, 07:55 AM
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#15
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Site Team
Join Date: Oct 2014
Posts: 15,301
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There is a safety feature built into the furnace that will prevent it from starting if it has had several failed starts. Remove the fuse for the furnace to completely disconnect power. Let it sit for a few minutes then reinsert the fuse and try again.
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09-09-2016, 06:12 PM
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#16
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Site Team
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 9,850
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Bummer about the relay falling off the board.
You should look at the Dinosaur replacement boards for that furnace.
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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09-13-2016, 09:24 AM
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#17
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Junior Member
Join Date: Sep 2016
Posts: 8
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Hi, I have taken the fuse out and replaced it with a new one with the same results. As I said before the time delay relay separated from my circuit board. I am looking for one online but I not sure of the model # associated with the circuit board. I know the model and serial # for the furnace itself but not sure if a separate # exists for the board. If someone could give this information it help in the online search for a board that is compatible with my furnace. Thanks.
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09-13-2016, 09:53 AM
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#18
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Left Coast
Join Date: Dec 2014
Location: vancouver,washington
Posts: 15,649
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All you need is model number....serial number maybe...The new board I put in mine was different shaped then the original, but they used a cross reference to send me the correct one
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09-13-2016, 12:24 PM
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#19
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Site Team
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 9,850
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Just call or email Dinosaur and they'll get you the right one.
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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