Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 11-30-2010, 02:13 PM   #1
Junior Member
 
Join Date: Aug 2009
Posts: 23
Furnance Issues Suburban NT 40

I am having some problems with my furnance and no one so far can figure it out and I am quickly becoming an expert!! lol


It starts the blower and lights the burner and burns for a while and then burner shuts down and trys to relight 3 times and never does.

Things I know that should help those knowledgable

Dinosaur Board less than year old and light turns green when blows kicks on and turns red when burner trys to light. Tested was told works

When trying to relight the ignightor does work lots of spark

Thermosat less than year old and has worked all last winter.

New sail switch Last week
New Limit Switch Last Week
new Propane regulator at tank last week

Furnace acts up if plugged in or on batteries

I can shut it off when it does not relight and kick the thermostat back on after all shuts down and will burn for a while.

I am running out of parts to throw at it I think?
__________________

__________________
skidworth is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 11-30-2010, 02:48 PM   #2
Senior Member
 
GaryKD's Avatar
 
Newmar Owners Club
Join Date: Jul 2006
Location: Wellington, Florida
Posts: 12,322
Hi skidworth,
When you replaced the regulator did you notice if any urine colored liquid came out of the regulator? If so, you may have a bad tank of propane. The new regulator may be clogged again.
__________________

__________________
Gary
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
The Avatar Is Many Times Around The USA
Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours
GaryKD is offline   Reply With Quote
Old 11-30-2010, 04:55 PM   #3
Junior Member
 
Join Date: Aug 2009
Posts: 23
I did not It has been filled twice since the swap though
__________________
skidworth is offline   Reply With Quote
Old 11-30-2010, 05:20 PM   #4
Senior Member
 
Join Date: Feb 2009
Posts: 150
Quote:
Originally Posted by GaryKD View Post
Hi skidworth,
When you replaced the regulator did you notice if any urine colored liquid came out of the regulator? If so, you may have a bad tank of propane. The new regulator may be clogged again.
FYI that urine is garlic oil used to oderize the propane. There's a small amount put in otherwise propane has not smell. Sometimes to much may be present and clog things up.
__________________
Traveler52 is offline   Reply With Quote
Old 11-30-2010, 05:26 PM   #5
Senior Member
 
Join Date: Feb 2009
Posts: 150
Have you tested the following?
D. Burner Ignites But Shuts Off:
1. Check to be certain that flame sensor is over slots in the main burner and that the
main burner flame is burning against the tip of the flame sensor - adjust by bending
the sensor probe. NOTE: Sensor probe should be in the inner blue cone of the
burner flame, approximately 1/4" to 5/16" above the burner.
2. If the burner still goes off and into lockout, check the wire connections at the flame
sensor and the module board.
3. If wire connections are okay, check for continuity through the flame sensor wire.
4. If the continuity of the flame sensor wire is okay, check with microamp meter in
series with the flame sensor and flame sensor wire to be certain the flame sensor is
generating at least seven microamps within seven seconds after the burner is ignited.
Connect the meter as follows: (+) to sensor wire, (-) to sensor probe. Adjust the
position of the sensor probe, check air adjustment and check for carbon deposits on
the sensor probe if the reading is less than seven microamps.
5. When the flame sensor circuit is generating at least seven microamps, but the burner
still goes off and into lockout, replace the module board.
__________________
Traveler52 is offline   Reply With Quote
Old 11-30-2010, 05:30 PM   #6
Senior Member
 
palehorse89's Avatar


 
Newmar Owners Club
Join Date: Oct 2009
Posts: 7,746
The oderant in propane is called" eythyl mericaptain" (spelling?). It is a clear super stinkie liquid. 713 cc's (about 8 oz) to stink up 9,000 gallons in a semi. I use to operate the propane rack at the refinery where i work. It is not oil.TWO CLOSELY CHECKED TESTS EVERYDAY FOR PROPANE ARE FOR CORRISION (NO NEED TO EXPLAIN ABOUT THIS) AND OLIFINS. IF T5HE OLIFINS ARE TO FAR OUT OF SPEC. IT WILL NOT BURN RIGHT,PLUGGING THINGS UP IN THE GAS VALVE.
__________________
2000 Newmar MADP 4060, 350ISC, Spartan MM, IFS 2011 Jeep JK, M&G Braking, 2014 MTI 27' Hog Hauler, Wireless brake control, 2006Ultra & 1989 Springer
palehorse89 is online now   Reply With Quote
Old 11-30-2010, 05:55 PM   #7
Senior Member
 
Join Date: Nov 2010
Location: hanson ma
Posts: 206
hi another posiblity wold a solinoid coil on the gas valve going bad i know iv changed alot of failed coils on gas cloths driers that would act up like you decrisbe work a while from a cold start but then openup only to go back to work after cooling off just figured i would add my2cents lee
__________________
hometool is offline   Reply With Quote
Old 11-30-2010, 06:11 PM   #8
Community Moderator
 
"007"'s Avatar


 
Nor'easters Club
Workhorse Chassis Owner
iRV2 No Limits Club
Join Date: Oct 2004
Posts: 26,781
It looks like the flame sensor ceramic is cracked or dirty.

TROUBLE SHOOTER

GAS HEATERS
__________________
98KSCA, 99MACA, 03 KSCA-3740- 8.1 Chev-- ALLISON Trans, now in good hands
VISIT the NEWMAR QUICK TIPS & EASYMODS 1 & 2
QUICK TIPS # 3
RV SYSTEMS & APPLIANCES & RECALLS --- TECH INFORMATION
"007" is offline   Reply With Quote
Old 12-01-2010, 07:38 AM   #9
Senior Member
 
Join Date: Feb 2009
Posts: 150
Quote:
Originally Posted by palehorse89 View Post
The oderant in propane is called" eythyl mericaptain" (spelling?). It is a clear super stinkie liquid. 713 cc's (about 8 oz) to stink up 9,000 gallons in a semi. I use to operate the propane rack at the refinery where i work. It is not oil.TWO CLOSELY CHECKED TESTS EVERYDAY FOR PROPANE ARE FOR CORRISION (NO NEED TO EXPLAIN ABOUT THIS) AND OLIFINS. IF T5HE OLIFINS ARE TO FAR OUT OF SPEC. IT WILL NOT BURN RIGHT,PLUGGING THINGS UP IN THE GAS VALVE.
Sorry about the miss information this is what I was told by a service guy yeara ago when we he found a regulator pluged with a yellowish oily substance. Is this yellowish substance the oderant??
__________________
Traveler52 is offline   Reply With Quote
Old 12-01-2010, 08:23 AM   #10
Junior Member
 
Join Date: Aug 2009
Posts: 23
is the flame sensor the same as the ignitor up front that sparks to ignite the burner and can you just buy the selonoid on top of the gas valve or do u need to buy the hole valve
__________________
skidworth is offline   Reply With Quote
Old 12-01-2010, 12:06 PM   #11
Senior Member
 
Dave78Chief's Avatar
 
Join Date: Jun 2009
Posts: 1,513
Quote:
Dinosaur Board less than year old and light turns green when blows kicks on and turns red when burner trys to light. Tested was told works

and

When trying to relight the ignitor does work lots of spark.
This means:
1. There is power to the board (green light)
2. The board is sending the signal to the gas valve to open. (red light)
3. The board is trying to light the furnace but there is no gas for ignition during retry.

Combined with:
Quote:
It starts the blower and lights the burner and burns for a while and then burner shuts down and trys to relight 3 times and never does.
Means:
When furnace is hot, gas delivery falls off.
3 trys without ignition just means board goes into lock out mode. Reset by power cycling.
Most likely one of the relay coils in the gas valve is opening up when the relay heats up. Once it cools down, they make contact again.
To ensure there is not a bad connection between board and valve, use a voltmeter to measure votage at gas valve during the retry cycle (looking for heat induced open in wiring; could also be weak/broken lan on control board).
Also possible is the gas line is restricted (flow reduction) however not likely as the high gas flow would reduce flow in that case real quick therby shutting down unit.

Dave
__________________
Dave78Chief is offline   Reply With Quote
Old 01-17-2011, 03:52 PM   #12
Junior Member
 
Join Date: Aug 2009
Posts: 23
Thanks For all you help in ended up needing a new gas valve on the furance
__________________

__________________
skidworth is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Beware when purchasing a Suburban water heater gwhite RV Systems & Appliances 13 08-17-2013 11:24 AM
Atwood & Suburban water heaters & Furnace "007" RV Systems & Appliances 1 08-07-2010 10:37 PM
KVH & Dish Network Compatibility Issues Gadget Man Technology: Internet, TV, Satellite, Cell Phones, etc. 12 07-17-2010 03:04 PM
Alpine Brake Issues - All Old Rv'er Alpine Coach Owner's Forum 29 11-16-2009 07:53 PM
FIXED!! (tranny issues) rockcj Alpine Coach Owner's Forum 13 10-30-2005 10:52 AM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 05:55 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.