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09-19-2020, 01:04 AM
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#1
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Senior Member
Vintage RV Owners Club
Join Date: Feb 2020
Posts: 142
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Furnace problems. I don’t know what else to replace to get it fired up.
https://app.photobucket.com/u/Chieft...1-9dd42480b65f <——— photo of suburban furnace.
I replaced the limit switch and electrode and when I get the ticking noise I used to be able to see the electric spark happening on the left side through the little circle window but even after replacing the things I mentioned i still get no sparks. It might do it one time the entire clicking session but that’s it. Can I remove the glass window and stick a candle lighter in there to ignite it? Anyone done this before? I gave up on this thing last season and would like to get it fired up for this upcoming cold season. Also the fan sounds like it’s hitting something every time it comes around.
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09-19-2020, 05:16 AM
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#2
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Senior Member
Join Date: Oct 2017
Location: Boston,ma
Posts: 908
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Go to the Wanderlodge owners group site. Then do a search on suburban furnace. there is a whole thread on how to troubleshoot them.
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09-19-2020, 10:36 AM
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#3
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Senior Member
Join Date: Jan 2018
Location: Capistrano Beach, California
Posts: 4,465
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Ticking with no spark, correct?
First, be sure the igniter probe is clean as well as the metal piece to which the spark is to ground, usually the burner. Remove all soot/rust from both. Second, set the gap between the probe and ground to ~1/8".
If the above does not produce a regular spark, try replacing the igniter module.
I would not suggest you stick a lighted candle into the furnace. Perhaps a butane lighter with a long "nose", but only if you have someone else turn ON the furnace so the flame is already present from the lighter before the gas valve opens. In other words, you create a manual "pilot light".
__________________
Larry, Eileen, and Finley
2004 Alpine 36FDDS
Third motor home, first Alpine, no need for another.
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09-19-2020, 01:10 PM
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#4
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Senior Member
Join Date: Nov 2015
Posts: 26,643
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That looks like an NT series furnace
Service Manual...see section C items 8 - 12
http://techsupport.pdxrvwholesale.co...ice-Manual.pdf
__________________
I took my Medication today. HAVE YOU?
Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
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09-19-2020, 09:59 PM
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#5
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Senior Member
Damon Owners Club
Join Date: Apr 2020
Location: Clovis NM
Posts: 4,389
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Quote:
Originally Posted by Ljwt330
Ticking with no spark, correct?
I would not suggest you stick a lighted candle into the furnace. Perhaps a butane lighter with a long "nose", but only if you have someone else turn ON the furnace so the flame is already present from the lighter before the gas valve opens. In other words, you create a manual "pilot light".
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LOL! He didn't say a lit candle, he said a candle lighter, exactly the same thing you described.
__________________
2006 Damon Daybreak 3276 35'with 5 Star Tuner. 3 200 Amp Lithium batteries and 2000 watt PSW inverter/charger. 2013 Elantra on a Master Tow dolly.
Retired USAF
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09-20-2020, 08:26 AM
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#6
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Senior Member
Join Date: Jan 2018
Location: Capistrano Beach, California
Posts: 4,465
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Quote:
Originally Posted by HarryStone
LOL! He didn't say a lit candle, he said a candle lighter, exactly the same thing you described.
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Well, that's what I get for reading too fast! Never heard of them by that reference though.
__________________
Larry, Eileen, and Finley
2004 Alpine 36FDDS
Third motor home, first Alpine, no need for another.
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09-30-2020, 08:29 PM
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#7
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Senior Member
Vintage RV Owners Club
Join Date: Feb 2020
Posts: 142
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Quote:
Originally Posted by Ljwt330
Ticking with no spark, correct?
First, be sure the igniter probe is clean as well as the metal piece to which the spark is to ground, usually the burner. Remove all soot/rust from both. Second, set the gap between the probe and ground to ~1/8".
If the above does not produce a regular spark, try replacing the igniter module.
I would not suggest you stick a lighted candle into the furnace. Perhaps a butane lighter with a long "nose", but only if you have someone else turn ON the furnace so the flame is already present from the lighter before the gas valve opens. In other words, you create a manual "pilot light".
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I replaced the igniter module and checked gap and have spark now but no fire! Hmmm
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09-30-2020, 08:34 PM
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#8
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Senior Member
Join Date: Nov 2015
Posts: 26,643
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Guess it isn't an NT series?????
__________________
I took my Medication today. HAVE YOU?
Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
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09-30-2020, 08:47 PM
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#9
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Senior Member
Vintage RV Owners Club
Join Date: Feb 2020
Posts: 142
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Quote:
Originally Posted by Old-Biscuit
Guess it isn't an NT series?????
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It’s a NT34S. I have spark but no ignition now...
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09-30-2020, 09:02 PM
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#10
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Senior Member
Tiffin Owners Club
Join Date: Aug 2016
Location: Bastrop Texas
Posts: 1,343
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I may not have read everything but in the original post you also mention that the fan seems to be hitting something. Is that still and issue. Also what did you do prior to finally getting the ignitor to spark. So now it an issue of no gas. If so I think it is time to take it our and do some work on it on a bench. lightly tapping on the regulator and switch might help with the gas flow. Normally on start up the fan will come on first then the ignition followed by heating the thermocouple to keep the flame going until thermostat tell is to stop.
__________________
2000 Allegro Bus 35R 3126 Cat 300 Allison 3060MD 6 speed
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09-30-2020, 09:07 PM
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#11
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Senior Member
Join Date: Nov 2015
Posts: 26,643
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Quote:
Originally Posted by Chieftain27
It’s a NT34S. I have spark but no ignition now...
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Did you check out the troubleshooting in the manual link?
__________________
I took my Medication today. HAVE YOU?
Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
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09-30-2020, 09:13 PM
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#12
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Senior Member
Join Date: Mar 2006
Location: Full Time USA
Posts: 2,216
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Purchase this tuneup kit
https://pdxrvwholesale.com/products/...4s-tune-up-kit
Furnace that age should have a tuneup kit installed.
Just make sure that heat exchanger does NOT have any rusted out holes in it! If it does please dont use it.
If you do indeed open it up the fan(s) "might" be rubbing on a shroud. Also the burner "might" be rusted out" If the limit switch is not functioning it won't turn on the gas valve.
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Robert & Deb
07 Discovery 39v FWS Full Timers, Henniker NH
1K solar - 05 Jeep Grand Cherokee
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10-01-2020, 08:05 AM
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#13
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Senior Member
Join Date: Aug 2020
Location: Mobile RV Tech
Posts: 123
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You need to pull the furnace and give it a good tune-up. I have experienced two issues with this furnace.
If the fan motor starts and then 20 seconds later you hear one click or clunk, that is the gas valve energizing. If you don't get a spark at that time, replace the circuit board. It sounds like your circuit board is intermittent.
If you get the gas valve energizing and a spark but no ignition. you need to clean out the LP orifice. If it has not worked for the past year or so, it probably has a bug stuck inside the orifice.
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10-01-2020, 08:21 PM
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#14
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,593
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Quote:
Originally Posted by Chieftain27
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Follow old-biscuit's advice, he knows RV appliances.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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