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Old 11-03-2014, 06:46 PM   #1
2 Rivet Member
 
1970 27' Overlander
Tryon , North Carolina
Join Date: Oct 2013
Posts: 60
NT30SP will not fire

Hi again all!
I have just plumbed and wired my new to me furnace. When I turn the thermostat to a temp higher than room temp, I hear it click, then the fan comes on and then the igniter starts sparking (I know this because I can see it in the peep window). But there is no heat. I do not smell gas either (good, right?) So, what am I doing wrong or what is my problem with this furnace? Where do I go from here?
Thank you in advance for the schooling!
Al
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Old 11-03-2014, 07:24 PM   #2
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1974 Argosy 20
2014 20' Flying Cloud
Kooskia , Idaho
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"new to me furnace"? Do you mean it is a used furnace? Do you know for sure it worked when you got it?

If it is sparking, but not lighting, it sounds like there is either no gas, or the electric gas valve is not opening. That could be a bunch of things, from defective valve, to circuit board issues, to electrical issues to the gas valve itself.

You are sure you have propane, that is it is on and other appliances are working? Also, sometimes it takes a bit of time for the propane to get to the furnace on a new install. I assume you have tried it several times.
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Old 11-03-2014, 07:25 PM   #3
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1981 31' Excella II
New Market , Alabama
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My guess is you don't have propane going to it. A valve is closed or pipe is kinked etc. Does the stove work? Do you have the intake blocked?

Perry
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Old 11-03-2014, 07:26 PM   #4
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1974 Argosy 20
2014 20' Flying Cloud
Kooskia , Idaho
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Also, on Airstreams of that era, there was a shut off valve for each appliance, including the furnace. Are you sure that valve is on?
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Old 11-03-2014, 08:13 PM   #5
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1970 27' Overlander
Tryon , North Carolina
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Posts: 60
Thank you for the responses! The cook top works great. I cannot find a shutoff valve under the trailer. I removed the original furnace as it was rusted through.
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Old 11-03-2014, 08:14 PM   #6
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1970 27' Overlander
Tryon , North Carolina
Join Date: Oct 2013
Posts: 60
It is a used furnace. The PO of the furnace said it worked before he took it out of his RV.
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Old 11-03-2014, 08:18 PM   #7
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1970 27' Overlander
Tryon , North Carolina
Join Date: Oct 2013
Posts: 60
I have tried to fire it up a few times. Should I loosen the gas at the shutoff valve? I did have to cap the furnace line when I renovated and reinstalled the cook top as it was leaking. What step by step should I take from here?
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Old 11-05-2014, 10:32 AM   #8
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1974 Argosy 20
2014 20' Flying Cloud
Kooskia , Idaho
Join Date: Jul 2009
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The first thing to try is to loosen the gas fitting to the furnace and determine that you actually have gas there.

A used furnace is always suspicious in my mind. When things sit they tend to go bad, and so the "worked the last time I used it" may be of no value.
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Old 11-05-2014, 01:54 PM   #9
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1981 31' Excella II
New Market , Alabama
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So why would one take a running furnace out of an RV?

Perry
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Old 11-05-2014, 01:58 PM   #10
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2007 22' International CCD
Corona , California
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Possibly the same reason I took an Atwood 6 gallon hot water heater out that was working perfectly. To install a better tankless one.

Agreed, unless you actually see it work, I'd be a bit suspicious too.



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'The Silver HamShack' ('07 International 22FB CCD 75th Anniversary)
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Old 11-05-2014, 07:19 PM   #11
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1970 27' Overlander
Tryon , North Carolina
Join Date: Oct 2013
Posts: 60
It was parted out of a wrecked trailer. I have 50 bucks in a furnace vs. a 700+ new furnace. Couple parts and I'm up and running and I learned something about furnaces. As I go down the checklist from the owners manual, looks like a gas valve. Will know more tomorrow.
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Old 11-05-2014, 10:27 PM   #12
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2007 22' International CCD
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Best part is when you are done getting it working you will understand how it works in detail...and can fix it quickly.


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Rich, KE4GNK/AE, Overkill Engineering Dept.
'The Silver HamShack' ('07 International 22FB CCD 75th Anniversary)
Multiple Yaesu Ham Radios inside and many antennae sprouting from roof, ProPride hitch, Prodigy P2 controller.
2012 shortbed CrewMax 4x4 Toyota Tacoma TV with more antennae on it.
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Old 11-06-2014, 07:23 AM   #13
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1981 31' Excella II
New Market , Alabama
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I replaced mine because the cost of fixing it was getting to be a time waster and when I want it to work it needs to work. Mine worked one day and not the next.

Perry
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Old 11-10-2014, 04:17 PM   #14
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1970 27' Overlander
Tryon , North Carolina
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Posts: 60
New gas valve and she works like a jewel! Woo hooo!
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