Sunline RV Forum
Sunline User Photos

Go Back   Sunline Coach Owner's Club > Technical Forums > Repairs and Maintenance
Click Here to Login

Join Sunline Club Forums Today


Reply
 
Thread Tools Search this Thread Display Modes
Old 01-08-2014, 02:27 PM   #1
Junior Member
 
Join Date: Jan 2014
Location: North Carolina
Posts: 15
SUN #5992
frodo is an unknown quantity at this point
Atwood furnace blower problem?

My furnace is a 7920-II serial # 1639234. All has been well until this recent cold snap. On a very (for nc) cold day (15 degrees) the furnace stopped due to running out of fuel. (Middle of the night of course) I went outside and flipped the fuel switch to a new full tank and restarted the furnace.

It was producing very little heat so I lit a burner on the stove and the flame was very low, about half the usual flame height while the furnace was running. Turned off the burnerand left the furnace running and went back to sleep hoping for the best. Woke up in a cold TT - furnace was not running.

After checking the tank and finding it full I moved all the switches open and closed several times thinking maybe something was frozen. Went back inside and lit a stove burner - viola - strong flame. Turned the thermostat up to relight the furnace and the blower ran at about half, or slower speed and stopped after 10 seconds or so with no ignition.

Much warmer weather now and the blower has the same problem. Starts at a very slow speed and then stops after a few seconds. Control board shows one blink at startup. One blink code reads "input air restricted" or something to that affect.

Any ideas on possible solution - other than write a check???

By the way, this Sunny will be for sale later this year. Have been living in it while I remodel my new (to me) house.

Clark
__________________

__________________
frodo is offline   Reply With Quote
Old 01-08-2014, 05:16 PM   #2
Senior Member
 
Join Date: Apr 2011
Location: Maine
Posts: 2,918
SUN #2097
mainah is an unknown quantity at this point
Inside of the furnace is a "sail" switch it is actuated by air flow if the switch does not "proof" the gas valve will not open allowing the burner to light. Bee's nest in the air intake outside, low battery not allowing the fan to turn fast enough or a bad blower motor can cause your problem.
__________________

__________________
mainah is offline   Reply With Quote
Old 01-08-2014, 06:20 PM   #3
Senior Member
 
Gene's Avatar
 
Join Date: Jan 2009
Location: Rhode Island
Posts: 1,515
SUN #768
Gene is an unknown quantity at this point
Yup, what mainah said above ^ ... particularly the battery voltage.
__________________

Gene & DW Ginny
2002 Sunline T-2363
2008 Toyota 4-runner 4wd 4.7L V-8
Reese Dual Cam straightline - P3 Brake controller
Gene is offline   Reply With Quote
Old 01-08-2014, 07:05 PM   #4
Junior Member
 
Join Date: Jan 2014
Location: North Carolina
Posts: 15
SUN #5992
frodo is an unknown quantity at this point
Quote:
Originally Posted by mainah View Post
Inside of the furnace is a "sail" switch it is actuated by air flow if the switch does not "proof" the gas valve will not open allowing the burner to light. Bee's nest in the air intake outside, low battery not allowing the fan to turn fast enough or a bad blower motor can cause your problem.
Thanks for the response Mainah.

I'm familiar with the "sail" switch function from the schematic but as with most things installed in a TT finding the actual part and getting access to it is a PITA. The "outside" air in a 2263 is actually inside under the cabinets. I can see it clearly and turned the fan cage some by hand. Nothing seems to be blocking air flow. A bit stiff to turn so could be a bearing or maybe the voltage. The actual motor is so hidden behind cabinet material that I would prefer to postpone attempting to remove it for inspection and testing until I try every other suggestion.

I may be able to track down a place to test the voltage on the control board. At least something to try. The other DC voltages around the TT are up to spec.

Any other thoughts on making the fan motor run faster??

Clark
__________________
frodo is offline   Reply With Quote
Old 01-09-2014, 06:24 AM   #5
Senior Member
 
Join Date: Apr 2011
Location: Maine
Posts: 2,918
SUN #2097
mainah is an unknown quantity at this point
Actually the heaters are not hard to remove and it sure beats trying to work on them where they are. Yes first check the voltage at the battery and the board usually the boards are not too badly hidden. Do you have the camper plugged in?
__________________
mainah is offline   Reply With Quote
Old 01-09-2014, 08:31 AM   #6
Junior Member
 
Join Date: Jan 2014
Location: North Carolina
Posts: 15
SUN #5992
frodo is an unknown quantity at this point
The board is fairly easy to access. Just remove the cover and two screws that hold it in place. I'll try checking the voltage today.

Yes the power is connected and all other things are working ok. I'm using an electric heater to keep the place warm each night so I have time to work on the furnace. Still it looks like a PITA to remove.

Anyone ever removed one from a T-2263? And if the motor bearings are toast where can one find a replacement?
__________________
frodo is offline   Reply With Quote
Old 01-15-2014, 11:27 AM   #7
Junior Member
 
Join Date: Jan 2014
Location: North Carolina
Posts: 15
SUN #5992
frodo is an unknown quantity at this point
Finally got around to testing the blower voltage and it is solid at 12.5 volts. The blower starts with a "rotational" clicking/thumping noise and never get over half speed, or so. Turns off after 15 seconds with a click - probably the sail switch shutting it off for lack of speed/blowing power.

I'm guessing a bearing is shot in the blower motor and may need replacing. Any known sources on a "new" blower motor? Or ideas on how to fix this one?
__________________
frodo is offline   Reply With Quote
Old 01-15-2014, 05:56 PM   #8
Senior Member
 
noralee's Avatar
 
Join Date: Sep 2012
Location: North Carolina
Posts: 347
SUN #4422
noralee is an unknown quantity at this point
hi frodo,
wishing you luck fixing your furnace.

i am also in nc, and during the cold snap last week i woke up also in a freezing camper...i had run out of propane middle of the night. at about 10deg. or so, i had to get up go outside and switch the tanks over.
glad for warmer weather. now, anything above 20 seems 'not so bad.'
good luck and warmth through the winter,
nl
__________________
1983 Sunline TT1350
noralee is offline   Reply With Quote
Old 01-15-2014, 06:21 PM   #9
Junior Member
 
Join Date: Jan 2014
Location: North Carolina
Posts: 15
SUN #5992
frodo is an unknown quantity at this point
Why is it that the propane always runs out in the middle of the night? Seems like it knows!!!! Where u at in NC? I'm in Goldsboro now. Spent one winter in New Bern - nice town.

Frodo
__________________
frodo is offline   Reply With Quote
Old 01-15-2014, 07:09 PM   #10
Senior Member
 
noralee's Avatar
 
Join Date: Sep 2012
Location: North Carolina
Posts: 347
SUN #4422
noralee is an unknown quantity at this point
i'm about 20 miles nw of asheville, and new to the state, just a few months here. i'm up in the mountains though, so i get more snow and cold than asheville. yes, not only in the middle of the night, has to be in record breaking cold
i woke up so cold and it took me a minute to realize what happened. i'm using a small electric space heater now since i wasn't able to get a large propane tank here for the winter. filling up the smaller ones even as 'refills' is pretty expensive so not much cheaper i don't think. the furnace works better though. my camper is pretty small and it heats up so quickly with furnace. only a 1350.
__________________
1983 Sunline TT1350
noralee is offline   Reply With Quote
Old 01-16-2014, 07:48 AM   #11
Senior Member
 
Join Date: Apr 2011
Location: Maine
Posts: 2,918
SUN #2097
mainah is an unknown quantity at this point
You can take the motors apart they use bronze bushings that were impregnated with oil of course they dry out over the years a good cleaning of the shaft and some light grease and your good to go for a few more years.
__________________
mainah is offline   Reply With Quote
Old 01-16-2014, 07:59 AM   #12
Junior Member
 
Join Date: Jan 2014
Location: North Carolina
Posts: 15
SUN #5992
frodo is an unknown quantity at this point
Asheville is a wonderful location in the summer. Winter is another story unless you're into skiing and snowshoeing. I left New Hampshire to get away from all that cold. Brrrr.

I'm using an electric heater while I repair my furnace and it heats this 2263 nicely. Ordering a new motor ($84 plus shipping) so the furnace should be back in service in a week or so. This 2263 uses up a 30lb tank of propane every two weeks in winter. $20.28 per refill so not bad for furnace, stove, and hot water. And winter is much shorter here than Asheville area. Camellias in bloom and daffodils coming up now,

Good luck this winter.

Frodo
__________________
frodo is offline   Reply With Quote
Old 01-16-2014, 08:07 AM   #13
Junior Member
 
Join Date: Jan 2014
Location: North Carolina
Posts: 15
SUN #5992
frodo is an unknown quantity at this point
Quote:
Originally Posted by mainah View Post
You can take the motors apart they use bronze bushings that were impregnated with oil of course they dry out over the years a good cleaning of the shaft and some light grease and your good to go for a few more years.
Already have the new motor on order. If the take apart and re-oil works on the old one I'll clean it up and offer it on ebay for the next unlucky Sunny owner. At $84 for a new one a "refurbished" one should bring $45 or so on Ebay. I would have paid that if available.

Frodo
__________________
frodo is offline   Reply With Quote
Old 01-17-2014, 04:30 PM   #14
Junior Member
 
Join Date: Jan 2014
Location: North Carolina
Posts: 15
SUN #5992
frodo is an unknown quantity at this point
Quote:
Originally Posted by mainah View Post
You can take the motors apart they use bronze bushings that were impregnated with oil of course they dry out over the years a good cleaning of the shaft and some light grease and your good to go for a few more years.
Take a bow Mainah. Was warm today so I decided to dismantle the furnace and try your suggestion of re-oiling the motor bearings. Real PITA to get the blasted thing out where I could work on it. Thankfully I took many digital photos of the dis-assembly process, especially the wiring.

It comes apart rather easily and the fans slipped off the shafts with a little encouragement (and a few curse words). The ends of the motor are a bit more difficult to remove to access the bronze bearings. Actually I gave up on the exhaust fan end and just pried it up enough to inject some oil into the felt? around the bushing. The other end came off easily so it got more oil on the felt? and the shaft.

Just to be sure the fix worked I tested the motor using my car battery and let it spin rapidly for a few minutes. Re installed everything clicked on the thermostat - and NOTHING!!! No fan spin, no voltage on the board.

Pulled it back out far enough to check all wiring and everything was hooked up correctly. (those digital pics came in handy) Hooked everything back in place and decided to try thinking beyond the furnace. Yeah! Check the fuses stupid!!! Replaced the blown fuse and all is now well. Don't know when the fuse blew but it happened while I was futzing around taking it apart and was not the original problem.

Thanks again for that thoughtful, experienced $84 saving suggestion. I was able to cancel the order for a new one before it shipped.

And yes if anyone asks - it took a long time working in such a small space. Maybe six hours figuring it out the first time. Could do it again in 30 minutes. Ain't experience wonderful!!!!

Frodo
__________________

__________________
frodo 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
Heater blower motor and furnace delay Hubba Sunline Community 3 12-10-2012 01:39 PM
Put furnace blower on a separate switch? EMD_Driver Modifications 20 03-02-2012 04:49 PM
Atwood Hotwater tank problem campingne Repairs and Maintenance 2 10-08-2009 02:15 PM



Disclaimer:

This website is not affiliated with or endorsed by Sunline RV or any of its affiliates. This is an independent, unofficial site.


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 10:18 PM.