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11-11-2016, 11:53 AM
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#1
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Junior Member
Join Date: Oct 2016
Location: Grand Blanc
Posts: 18
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Suburban NT30SP Furnace issue
Having issue with furnace, it will start up and fan blows but will not ingnite. It will blow cold air until I shut it down. I have researched a bit online and come up with either control board or sail switch. Either way I am going to have to pull it out but just checking to see if anyone else has had the same problem and maybe had some tips or more trouble shooting ideas. Thanks!
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11-11-2016, 01:15 PM
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#2
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Senior Member
Join Date: Apr 2015
Location: Elizabethtown, PA
Posts: 1,560
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Would be nice to know what model and year the RV is?
__________________
2004 Jay Feather 25E
2001 Ford Expedition 4X4 EB 5.4 3.55 rear
2004 Ford Expedition 4X4 EB 5.4 3.73 rear
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11-11-2016, 01:19 PM
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#3
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Senior Member
Join Date: May 2015
Location: Campbell Hall
Posts: 2,835
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You are already on the right track.
Good News: The furnace is getting 12VDC and a call for heat.
Good News: The fan is starting up.
Fails to look for:
- Sail moving and sail switch actually closing- Binding or switch replacement, broken wire?
- Igniter arcing - controller board, broken wire
- Propane flowing - gas valves: tank safety, kinked line, appliance valve, solenoid, wiring
Get out the DVM or VOM to check the sail switch. The rest is observations when the unit attempts to function.
Double-check that the propane tank safeties aren't tripped.
__________________
TT 2015 19RD "TheJayco"
TV 2003 F-350 "Montblanc" - Housebroken chore truck
Sitting in The Cheap Seats.
And proud of it!
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11-11-2016, 02:07 PM
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#4
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Junior Member
Join Date: Oct 2016
Location: Grand Blanc
Posts: 18
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Sorry, not sure why that doesnt show up like on yours...
It is a 1989 JayCrane 32 5th wheel
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11-11-2016, 02:12 PM
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#5
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Junior Member
Join Date: Oct 2016
Location: Grand Blanc
Posts: 18
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Thanks Mike,
I will have to pull the furnace out to check the sail switch, correct?
As for the propane saftey, are they per appliance or whole RV? My stove and water heater work fine.
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11-11-2016, 04:31 PM
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#6
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Site Team
Join Date: Apr 2012
Location: Newark, NY
Posts: 15,934
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We had a '96 Wilderness that wouldn't fire up, and found a small relay that controlled the gas regulator was stuck. My immediate reaction was give it a small tap with a screwdriver handle, and it DID fire up next time. Then it got replaced. Just something else to look at.
__________________
Moderator
Think you're too old to cry or swear out loud...walk into your hitch in the dark.
2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
2 new fluffy Corgis, Bayley and Stanley
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11-11-2016, 07:00 PM
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#7
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Junior Member
Join Date: Oct 2016
Location: Grand Blanc
Posts: 18
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Quote:
Originally Posted by JFlightRisk
We had a '96 Wilderness that wouldn't fire up, and found a small relay that controlled the gas regulator was stuck. My immediate reaction was give it a small tap with a screwdriver handle, and it DID fire up next time. Then it got replaced. Just something else to look at.
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Thanks for the tip! Where about was the relay located on yours?
__________________
- 1989 JayCrane 32 Designer Series
- 2004 GMC Sierra 2500HD 6.0L
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11-12-2016, 11:39 AM
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#8
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Site Team
Join Date: Apr 2012
Location: Newark, NY
Posts: 15,934
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Quote:
Originally Posted by Jketchum80
Thanks for the tip! Where about was the relay located on yours?
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It was right on the furnace housing, and visible when you opened up the outside door. It was a long time ago, and can't recall how many wires went to it, but do remember it wasn't very big, and I think it was held on with one screw. If you follow the wires from the gas flow regulator, they should lead you to it.
__________________
Moderator
Think you're too old to cry or swear out loud...walk into your hitch in the dark.
2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
2 new fluffy Corgis, Bayley and Stanley
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11-12-2016, 04:31 PM
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#9
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Site Team
Join Date: Apr 2012
Location: Newark, NY
Posts: 15,934
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Follow up: I think my old TT furnace was different than yours, but if you google "Suburban NT30SP furnace manual", there's one that gives a troubleshooting section that may be of help.
__________________
Moderator
Think you're too old to cry or swear out loud...walk into your hitch in the dark.
2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
2 new fluffy Corgis, Bayley and Stanley
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11-13-2016, 04:11 PM
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#10
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Junior Member
Join Date: Oct 2016
Location: Grand Blanc
Posts: 18
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So in the middle of winterizing I decided to just go ahead and pull the furnace out. Everything looks fairly good, not real dirty/dusty, no blockages and the sail switch seems to be functioning. It is somewhat rusty inside and around the igniter housing but the first thing I did when I began troubleshooting was pull out the igniter and clean it off with some sand paper, which didnt help anything. I dont know anything about these furnaces and i really dont want to screw it up more than it is so I may just go drop it at the repair shop and see what they come up with.
__________________
- 1989 JayCrane 32 Designer Series
- 2004 GMC Sierra 2500HD 6.0L
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11-13-2016, 04:16 PM
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#11
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Site Team
Join Date: Apr 2012
Location: Newark, NY
Posts: 15,934
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(...snip...)" I may just go drop it at the repair shop and see what they come up with.[/QUOTE]
Not a bad choice, as they'll probably have diagnostic tools, and parts. Keep us posted with what they find.
__________________
Moderator
Think you're too old to cry or swear out loud...walk into your hitch in the dark.
2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
2 new fluffy Corgis, Bayley and Stanley
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