Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
 
 


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 12-25-2009, 11:35 PM   #1
BobW
Senior Member
 
Join Date: May 2006
Location: Welches Oregon
Posts: 523
SF-42 furnace won't start

We have a 2006 Elite with a SF-42 furnace. Went out tonight to heat it up. The fans come on and it looks like I can hear some clicking. No heat. I tried turning the unit on and off a number of times. At some point a short blast of hot air comes out of the outside vent. Then nothing. The fan stays on. Plugged into 120 and I have 13 volts.
__________________

__________________
Bob and Kate Weigant
Welches Oregon
Elite 2006 36TK3
2007 M2 Freightliner
2005 Wrangler
In a land of the blind, the one eyed guy is king.
BobW is offline   Reply With Quote
Old 12-26-2009, 07:01 AM   #2
Motor31
Senior Member
 
Join Date: May 2005
Posts: 2,130
First thing to check, do you have a full tank of propane with the valve wide open? It sounds like it is sensing no or low pressure.
__________________

__________________
Mike Nancy and the fuzzies
Fulltiming since June 2004
Volvo 660 MH tow vehicle
2005 MS 38RL
2007 Saturn Ion "toad"
2010 Gold Wing "piggyback"
Motor31 is offline   Reply With Quote
Old 12-26-2009, 07:47 AM   #3
GlennWest
Senior Member
 
Join Date: May 2009
Posts: 321
Mine wouldn't come on the other day. Wife was cooking at stove with gas. Pressure was low"running on fumes". Changed out bottle all was well. jfyi
__________________
2006 Mobile Suites 32TK3 SOLD 2003 Teton Grand Freedom, 2006 Freightliner Centry 515 hp Detroit 60 Traveling USA welding pipe
GlennWest is offline   Reply With Quote
Old 12-26-2009, 10:50 AM   #4
BobW
Senior Member
 
Join Date: May 2006
Location: Welches Oregon
Posts: 523
Both tanks are full. Just before the igniter clicks on, I can smell gas coming out the outside vent. So I'm sure it's getting gas. Fans work.
__________________
Bob and Kate Weigant
Welches Oregon
Elite 2006 36TK3
2007 M2 Freightliner
2005 Wrangler
In a land of the blind, the one eyed guy is king.
BobW is offline   Reply With Quote
Old 12-26-2009, 04:26 PM   #5
RGordon
Senior Member
 
Join Date: Apr 2007
Location: Atoka, TN & North Ft Myers, FL
Posts: 158
I would look into the openings on the outside for wasp nest or mud dobbers. This will cause restriction of air flow preventing furnace from firing.
__________________
Ron & Libby Gordon
2007 F350 Ford Lariat Diesel DRW CC
2007 Mobile Suite 38RL3 #3698
RGordon is offline   Reply With Quote
Old 12-30-2009, 09:55 AM   #6
BobW
Senior Member
 
Join Date: May 2006
Location: Welches Oregon
Posts: 523
I found out the problem. After taking the heater out of the case, I took the burner out and found the gap in the electrode was more than 1/4 inch. I adjusted it to 1/2 inch and everything works now.
__________________
Bob and Kate Weigant
Welches Oregon
Elite 2006 36TK3
2007 M2 Freightliner
2005 Wrangler
In a land of the blind, the one eyed guy is king.
BobW is offline   Reply With Quote
Old 12-30-2009, 10:33 AM   #7
RGordon
Senior Member
 
Join Date: Apr 2007
Location: Atoka, TN & North Ft Myers, FL
Posts: 158
According to the service manual the spark gap should be 1/8" and is also used to complete the circuit through the ionized gas to the control board. You may still have issues!
__________________
Ron & Libby Gordon
2007 F350 Ford Lariat Diesel DRW CC
2007 Mobile Suite 38RL3 #3698
RGordon is offline   Reply With Quote
Old 12-30-2009, 11:53 AM   #8
BobW
Senior Member
 
Join Date: May 2006
Location: Welches Oregon
Posts: 523
That was to be 1/8 inch.
__________________
Bob and Kate Weigant
Welches Oregon
Elite 2006 36TK3
2007 M2 Freightliner
2005 Wrangler
In a land of the blind, the one eyed guy is king.
BobW is offline   Reply With Quote
Old 12-31-2009, 08:32 PM   #9
Diesel-Gypsy
Senior Member
 
Join Date: Mar 2007
Location: Qc. Canada
Posts: 206
Great!
Now I need to remember that tip....

Any idea how that gap got widened-out to 1/4" ?

Rick
__________________
2007 Carriage ROYALS INTERNATIONAL MONARCH 38
no truck yet…but looking
Diesel-Gypsy is offline   Reply With Quote
Old 01-01-2010, 03:16 PM   #10
BobW
Senior Member
 
Join Date: May 2006
Location: Welches Oregon
Posts: 523
Quote:
Originally Posted by Diesel-Gypsy
Great!
Now I need to remember that tip....

Any idea how that gap got widened-out to 1/4" ?

Rick
Just like any spark plug, the electrode evaporates from the heat of the spark. I think this is something you need to do every couple of years. By the way, it takes only one screw to undo the heater, disconnect the wires (4) and the gas line. The heater unit just slides out of it's metal box. You do need to take off the outside panel.
__________________

__________________
Bob and Kate Weigant
Welches Oregon
Elite 2006 36TK3
2007 M2 Freightliner
2005 Wrangler
In a land of the blind, the one eyed guy is king.
BobW is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 05:08 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
×