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 04-28-2019, 02:11 PM   #1
Member
 
Join Date: Nov 2017
Location: New York
Posts: 56
SUN #10153
Aariel is an unknown quantity at this point
Continued Heating Woes!

I must pull the fuse to get the camper heat (furnace) to go off and plug the fuse back in to get the heat to go back on. My HVAC guy checked the thermostat (I already bought a new one!) and said the thermostat is not the problem.



Where else should I look to correct this problem?

1997 Sunline Solaris T2653
Attached Images
File Type: jpg RV Furnace 1.jpg (29.4 KB, 5 views)
File Type: jpg RV Furnace 2 fuses.jpg (68.7 KB, 3 views)
__________________

__________________
Aariel is offline   Reply With Quote
Old 04-28-2019, 03:53 PM   #2
Senior Member
 
Join Date: Apr 2011
Location: Maine
Posts: 2,915
SUN #2097
mainah is an unknown quantity at this point
The thermostat is nothing more than an on/off switch. Try this disconnect the wires to the thermostat and see what happens when you put the fuse back in. If it once again runs one of two things shorted wiring or a toes up board.
__________________

__________________
mainah is online now   Reply With Quote
Old 04-28-2019, 05:13 PM   #3
Member
 
Tinstaafl's Avatar
 
Join Date: Nov 2018
Location: Pennsylvania
Posts: 96
SUN #10986
Tinstaafl is an unknown quantity at this point
To follow up on mainah's recipe, if you disconnect the thermostat and the furnace still runs non-stop after you put the fuse back in, locate the other end of the thermostat wire at the furnace control board and disconnect that.

If the furnace still runs non-stop after restoring power, the problem is in the control board. If it doesn't, the problem is a short in the thermostat wiring.

If your HVAC guy was on-site, it would have taken him no more than 5-10 minutes to do those checks for you.
__________________
Tinstaafl is online now   Reply With Quote
Old 04-29-2019, 07:54 AM   #4
Senior Member
 
Join Date: Apr 2011
Location: Maine
Posts: 2,915
SUN #2097
mainah is an unknown quantity at this point
I would be interested to know if it went through the normal cycle when you put the fuse back in blowing air for awhile then a couple of "clunks" then lighting. It really is not a good ideal to shut the thing down by pulling the fuse because it can not go through a post purge cycle. An ohm meter will tell you right away if the wire is shorted as long as the T stat wires are disconnected. If they are not then it's time for a board Dinosaur replacement boards are top notch. Don't think I have ever seen a board do that but then again I have only replaced a few and they all had the same won't fire problems.
__________________
mainah is online now   Reply With Quote
Old 04-29-2019, 08:50 AM   #5
Member
 
Join Date: Nov 2017
Location: New York
Posts: 56
SUN #10153
Aariel is an unknown quantity at this point
Oh gosh, all this is so complicated. The HVAC guy did disconnect the thermostat and the furnace did not shut down. He knows nothing of campers and asked if I could get a wiring schematic for him. He also told me to get advice from the forum.


The furnace does not to thru any cycle when on. It just blows hot air. After about 45 minutes, I pull the fuse again to turn it off.


How can we disconnect the thermostat wire from the fuse board when it is all behind the wall? (There is a little access panel above the circuit board but it really just accesses the water pipes for the shower. It reveals a large wire running up and down; I think that's the thermostat wire, but the opening does not give assess to the back of the fuse board.) I don't want to break open the wall. Perhaps does the whole board unscrew and come out?



When Mainah says, "An ohm meter will tell you right away if the wire is shorted as long as the T stat wires are disconnected," do you mean the thermostat wire disconnected at both ends, or just with the thermostat itself disconnected from the wire?


When you say "If they are not then it's time for a new board," do you mean to replace the entire panel of switches and fuses as shown in the pictures I posted above?


Thanks for all advice.
__________________
Aariel is offline   Reply With Quote
Old 04-29-2019, 03:22 PM   #6
Member
 
Tinstaafl's Avatar
 
Join Date: Nov 2018
Location: Pennsylvania
Posts: 96
SUN #10986
Tinstaafl is an unknown quantity at this point
The thermostat wire doesn't go to the fuse panel. It goes to a control board inside the furnace assembly. That's where you would disconnect the other end of that wire in order to see if it's a control board malfunction rather than a shorted wire, if you don't have an ohmmeter to test the wire with.

You get at the furnace assembly via an access panel on the outside of the camper.
__________________
Tinstaafl is online now   Reply With Quote
Old 04-29-2019, 04:17 PM   #7
Senior Member
 
Join Date: Apr 2011
Location: Maine
Posts: 2,915
SUN #2097
mainah is an unknown quantity at this point
The wires are behind or inside of the t stat all are a bit different the wires are generally red and white the jacket usually brown. Remove them first make sure they are not touching each other. Put the fuse in if it starts pull the fuse it shouldn't. Next you will have to access the furnace the same wires go to the control board remove one of the wires red or white does not matter. Put the fuse back in and see what happens. If it still starts the board is toast if it doesn't the wire is shorted somewhere rodents?. Again the t stat wires are just like a light switch they are either on or off no in between they have nothing to do with supplying power to anything.
__________________
mainah is online now   Reply With Quote
Old 05-01-2019, 06:03 AM   #8
Member
 
Join Date: Nov 2017
Location: New York
Posts: 56
SUN #10153
Aariel is an unknown quantity at this point
Thanks for this information. I'm passing it along to my HVAC guy and see what we can figure out.
__________________
Aariel is offline   Reply With Quote
Old 05-01-2019, 06:27 AM   #9
Member
 
Join Date: Nov 2017
Location: New York
Posts: 56
SUN #10153
Aariel is an unknown quantity at this point
Here are pictures of the furnace wiring.

Which wire is the thermostat wire?

How could you possibly replace a thermostat wire ... how could you get it from the wall to the furnace apparatus?


What is the "board" that I would replace if the problem is not the thermostat wire?


Thanks again for the help!
Attached Images
File Type: jpg RV furnace inside 1.jpg (84.7 KB, 7 views)
File Type: jpg RV Furnace inside 2.jpg (80.7 KB, 39 views)
File Type: jpg RV furnace inside 3.jpg (78.5 KB, 6 views)
File Type: jpg RV furnace inside closeup 1.jpg (87.1 KB, 45 views)
File Type: jpg RV furnace inside closeup 2.jpg (91.0 KB, 4 views)
File Type: jpg RV furnace inside closeup 3.jpg (89.2 KB, 3 views)
__________________
Aariel is offline   Reply With Quote
Old 05-01-2019, 07:49 AM   #10
Member
 
Tinstaafl's Avatar
 
Join Date: Nov 2018
Location: Pennsylvania
Posts: 96
SUN #10986
Tinstaafl is an unknown quantity at this point
The control board we've been talking about is at the extreme left of your pics, next to the switch, oriented vertically. I can't identify the thermostat wires from those pictures. They may well come in to a junction point external to the board, with factory wiring from that point to the board itself.

As for how you'd replace the wire should that be the problem, that can get interesting. The most practical method could be to find some other route than the original to get it from point A to point B.

No offense intended, but given your lack of familiarity with this sort of thing, you would probably be better off having it looked at by someone who's familiar with these systems. Costs money of course, but RVs are kissing cousins with boats. You know, those things usually described as a hole in the water you throw money at.
__________________
Tinstaafl is online now   Reply With Quote
Old 05-01-2019, 05:31 PM   #11
Member
 
Join Date: Nov 2017
Location: New York
Posts: 56
SUN #10153
Aariel is an unknown quantity at this point
Thanks for the suggestions. No offense taken, believe me I'd love to have somebody who knows what they're doing fix things. However, I'm an older widow with little money, no truck to haul my camper to Camper World (if I could even afford it), and I have to live in this camper with my dog for two more months until my tenants leave my house.



My friend the HVAC guy and I are trying to figure out which wire on the control board/furnace is the T-stat wire. None look small enough. Is there a relay in the air conditioner? That is, does the t-stat wire go to the AC and then thru a relay go down to the control board?









Quote:
Originally Posted by Tinstaafl View Post
The control board we've been talking about is at the extreme left of your pics, next to the switch, oriented vertically. I can't identify the thermostat wires from those pictures. They may well come in to a junction point external to the board, with factory wiring from that point to the board itself.

As for how you'd replace the wire should that be the problem, that can get interesting. The most practical method could be to find some other route than the original to get it from point A to point B.

No offense intended, but given your lack of familiarity with this sort of thing, you would probably be better off having it looked at by someone who's familiar with these systems. Costs money of course, but RVs are kissing cousins with boats. You know, those things usually described as a hole in the water you throw money at.
Attached Images
File Type: jpg RV furnace inside closeup 1.jpg (87.1 KB, 8 views)
__________________
Aariel is offline   Reply With Quote
Old 05-01-2019, 06:03 PM   #12
Senior Member
 
Join Date: Apr 2011
Location: Maine
Posts: 2,915
SUN #2097
mainah is an unknown quantity at this point
The wires are small but there are inside of a jacket they are hard and not flexible like the other ones they will be somewhere near the control board on the left side of your picture. I can not tell you how it interconnects with the AC without seeing it. I would guess it's part of the T stat. A board is around $100 so you really need to find someone that has a clue how the RV stuff works otherwise it can get expensive fast.
__________________
mainah is online now   Reply With Quote
Old 05-01-2019, 06:26 PM   #13
Member
 
Tinstaafl's Avatar
 
Join Date: Nov 2018
Location: Pennsylvania
Posts: 96
SUN #10986
Tinstaafl is an unknown quantity at this point
Quote:
Originally Posted by Aariel View Post
My friend the HVAC guy and I are trying to figure out which wire on the control board/furnace is the T-stat wire. None look small enough. Is there a relay in the air conditioner? That is, does the t-stat wire go to the AC and then thru a relay go down to the control board?
I would think that very unlikely, but my experience with campers is very limited. I'm much more familiar with residential work. I'd spend some time rooting around in the furnace enclosure looking for a cable that's the same as what you see at the thermostat.

On the bright side, you shouldn't be needing the heat for too much longer.
__________________
Tinstaafl is online now   Reply With Quote
Old 05-01-2019, 09:55 PM   #14
Moderator
 
Sunline Fan's Avatar
 
Join Date: Dec 2006
Location: Michigan
Posts: 5,981
SUN #123
Sunline Fan is an unknown quantity at this point
Three things stand out to me to check before going further:

1) disconnect furnace thermostat wires at thermostat and put fuse back in. You mayb have done this already, please confirm. The furnace shouldn’t start. If it does, leave the fuse in proceed to step two.

2) the red and black rocker switch on the outside of the furnace. Turn this to the off position. The furnace should go off. I’ve never tried this so I don’t know if it’ll be immediate or do a cool down cycle. Either way, it should sound different and shut down. If not, pull the fuse inside again to shut it down.

3) lift up the couch and there should be a big wood box around the furnace, made out of paneling. There should be screws somewhere to open this. I’ve never had mine apart, but once open, you should see the thermostat wires and power wires coming into there from somewhere. The thermostat wires should look like they do at the thermostat, probably in a brown casing. Follow these to where they connect to the furnace and see if you notice anything that looks like a problem down there.

4) the thermostat leads may have a plug in to the furnace, I’m not sure on this model. If they do, and if it looks like there’s a separate power wire, start the furnace and unplug this plug. This should disconnect the thermostat and wires and the furnace should cool and shut down.

If those four tests fail, I’m going to suspect the control circuit board too. It might be worth calling your local Camping World or RV dealer and ask if they can test your board if you bring it in. I know they have a tabletop devise to test water heater control boards in the same manner. If they can, pull it from the trailer and go have it tested.
__________________

__________________
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9467.8 (as of 5/26/19)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR
Sunline Fan 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
Suspension issues continued... Tod Osier Repairs and Maintenance 29 06-03-2019 09:44 PM
Heating problems. Samber4 Repairs and Maintenance 1 04-05-2013 05:16 PM
Heating troubles SelenaAutumn Repairs and Maintenance 1 11-26-2012 05:58 PM
Atwood Heating Element Replacement RichieRich Repairs and Maintenance 4 10-02-2012 10:12 AM
Heating Honda03842 Modifications 5 01-23-2010 01:56 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 06:03 PM.