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Old 12-27-2008, 06:26 PM   #1
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suburban furnace

I have a new suburban nt-24sp furnace and it only works on 110 electric service. Is it supposed to work off 12v?. What could be wrong? purchased tradwind last march and never used furnace except when hooked up to 110.
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Old 12-27-2008, 07:10 PM   #2
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Suburban Furnace

According to my manual, the NT-24SP is an RV furnace. The fan, and the gas valve operate off of 12 volt power. Power will be supplied by your coach battery or your Univolt convertor. Do you have a battery in your trailer now?
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Old 12-27-2008, 07:18 PM   #3
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It runs off the 12 volt system. If you're plugged into shore power (110ac), it is converted to 12vdc through your Univolt. If the furnace isn't operating off 12vdc, then your battery may not be holding a charge and needs to be replaced. Also double check to confirm that your battery is in place and connected.
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Old 12-27-2008, 08:49 PM   #4
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Thanks, I will check my battery. However, My lights are working off 12v!??......Maybe it's not fully charged. I'll try to hook my truck battery up to trailer. Thanks again.
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Old 12-27-2008, 08:52 PM   #5
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Are you plugged into shore power while your lights are running? Again, they will operate if plugged in, regardless of whether the battery is functional or not. Unplug the trailer from shore power to see if any of the 12vdc systems are working.
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Old 12-27-2008, 10:08 PM   #6
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I'm sorry, I'm almost a newbie. But, It appears that regardless of being hooked up to shore power or not the furnace will not come on. I've looked at all of the fuses on the converter and all seem good. Tomorrow I may try a tester on the wires to figure this out. I had a similar problem when I first puchased it, but can't remember what the solution was. But, I am sure that it only worked from shore power. All other 12 volt light work well disconnected from 110.
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Old 12-28-2008, 06:57 AM   #7
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I had the same problem at one time. It was a loose connector from the thermostat. I found the connector inside the bath area closet.
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Old 12-28-2008, 11:03 AM   #8
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Quote:
Originally Posted by gettysburg View Post
I have a new suburban nt-24sp furnace and it only works on 110 electric service. Is it supposed to work off 12v?. What could be wrong? purchased tradwind last march and never used furnace except when hooked up to 110.
Chances are your battery is not providing full power. The furnace will not start unless the "sail switch" is activated. The "sail switch" is activated by having enough air flow from the fan. If it works on shore power it has the voltage and current available to get the fan up to speed turning on the "sail switch". If on battery it will not get up to speed it appears to be battery problem.
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Old 12-28-2008, 11:10 AM   #9
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...regardless of being hooked up to shore power or not the furnace will not come on.
In your first post, you said that the furnace works on 110AC (shore power). Has this changed?
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Old 12-29-2008, 07:21 AM   #10
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furnace

Yes, The last time I used it, it would only work of 110. But, now it does not work on either. I've checked thermostat, wiring, and fuses. I may have to resort to taking it to someone.
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Old 01-02-2009, 07:10 PM   #11
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I found it. The Hot wire feeding the furnace was rubbing against a water pipe under sink area near furnace. All the insulation was rubbed off and wires were almost cut in half. Made the splice and all is well. Gotta remember to check those wires. Thanks to all.
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Old 01-02-2009, 07:38 PM   #12
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Glad to hear that you got it sorted.
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