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02-05-2020, 06:26 PM
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#1
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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Odd thermostat issue
Our furnace has now started hitting the set temp and then no matter how cold it gets after that it usually doesn't start up again until I reset the thermostat and then it runs again. At times it will work normally for two or three cycles, other times only once. Dometic claimed to never have heard of this, but they are sending out a new thermostat. Since the furnace will sometimes work for a couple of cycles and then works again when the thermostat is reset, I can't come up with anything accept a bad stat. Any other ideas?
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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02-05-2020, 07:30 PM
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#2
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Montana Master
Join Date: Mar 2019
Location: Milwaukie, OR
Posts: 1,470
M.O.C. #23668
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That's where I'd start as well. At least they're sending another one. Let's hope it does the trick.
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Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / HW Progressive EMS
2015 RAM 3500 Laramie Longhorn Crew Cab 4x4 DRW / Demco Recon Hitch on RAM Puck Ball
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02-06-2020, 07:17 AM
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#3
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Montana Master
Join Date: Dec 2007
Location: Kansas City, Missouri
Posts: 2,707
M.O.C. #7992
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Dick, I believe you are on the right path and the thermostat replacement is what I would try first. But, (there is always a but), as you well know intermittent problems can be anywhere. Board, sail switch, limit switches? Looking forward to learning from your misfortune. See you in Nebraska.
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2006 3000RK
2009 Ram 2500
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02-06-2020, 07:53 AM
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#4
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Established Member
Join Date: Jan 2020
Location: Cortez
Posts: 33
M.O.C. #25606
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I had a similar problem with the AC side. I would set my thermostats and the AC would kick on and I could leave and come back later to find out the AC never kicked back on and it was really hot in the trailer.
I took the covers off, Used some canned air to dust out the board and some q-tips with alcohol to clean the interior board gently and so far both have been working fine since then. I found a ton of dust in them that might have been causing the problem with the temp sensor reading correctly
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2019 Keystone Montana 372RD - Full Time
2017 Fiat 500c Abarth
2016 GMC Sierra All Terrain X
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02-06-2020, 08:59 AM
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#5
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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On mine, when i reset it the thermostat knows the right temp, for instance this morning the termostat knew it was 67 when it was set for 73 but didn't turn the furnace on. The only other option I can come up with is there's a problem with the board locking out and I'm turning it back on after the 1hr lock out is over. I'll let you know what I find.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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02-07-2020, 09:49 AM
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#6
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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Two clues developed before the mobile tech could show up. First I finally had a time when resetting the thermostat didn't work, but the furnace came on anyway about an hour later. Second, the cats started acting like there was a mouse in the basement and were looking thru the cold air return that's right next to the furnace. Based on the reset not always working and the Cat Scan we replaced the board with a Dinosaur board and all seems to be well now. Apparently the cats could hear something failing on the board because they since have had no interest.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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02-07-2020, 10:04 AM
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#7
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Montana Master
Join Date: Mar 2019
Location: Milwaukie, OR
Posts: 1,470
M.O.C. #23668
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Glad you got it fixed.
Maybe you could start a mobile "Cat Scan" business...
__________________
Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / HW Progressive EMS
2015 RAM 3500 Laramie Longhorn Crew Cab 4x4 DRW / Demco Recon Hitch on RAM Puck Ball
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02-07-2020, 08:38 PM
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#8
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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02-07-2020, 09:35 PM
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#9
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Montana Fan
Join Date: Feb 2020
Location: Hawkins - Tx
Posts: 142
M.O.C. #25774
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Does your new Cat Scan Co. need a consultant.
__________________
Gunther, Sheri and Calvin
2020 Montana 3812 MS with a Reese Goosebox
2006 Dodge 3500 Dually, LB, 6 Sp, 5.9 Cummins with Flashpaq Super Chip Tuner
South Bend Flywheel and Clutch, Loadlifter 5000 Rear Air Bag Kit
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02-07-2020, 09:52 PM
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#10
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Montana Fan
Join Date: Feb 2020
Location: Hawkins - Tx
Posts: 142
M.O.C. #25774
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Dick,
My 15 pound furry co-camper, Calvin is eminently qualified to assist in your “Cat Scan” venture. I thought my signature picture would show up on the post which shows Calvin sacked out in front of the fireplace, but I guess it didn’t, which made the last reply somewhat vague.
__________________
Gunther, Sheri and Calvin
2020 Montana 3812 MS with a Reese Goosebox
2006 Dodge 3500 Dually, LB, 6 Sp, 5.9 Cummins with Flashpaq Super Chip Tuner
South Bend Flywheel and Clutch, Loadlifter 5000 Rear Air Bag Kit
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02-08-2020, 09:32 AM
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#11
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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Here are the boys, currently working on detecting where the furnace ducts are located.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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02-08-2020, 09:44 AM
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#12
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Montana Fan
Join Date: Feb 2020
Location: Hawkins - Tx
Posts: 142
M.O.C. #25774
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Dick,
Those are some hard working guys! How go you attach the picture to your message? I’m using quick reply and I don’t see the option. Thanks for you help.
__________________
Gunther, Sheri and Calvin
2020 Montana 3812 MS with a Reese Goosebox
2006 Dodge 3500 Dually, LB, 6 Sp, 5.9 Cummins with Flashpaq Super Chip Tuner
South Bend Flywheel and Clutch, Loadlifter 5000 Rear Air Bag Kit
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02-08-2020, 10:22 AM
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#13
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Montana Master
Join Date: Mar 2019
Location: Milwaukie, OR
Posts: 1,470
M.O.C. #23668
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Click on the Go Advanced button, scroll down to Manage attachments
__________________
Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / HW Progressive EMS
2015 RAM 3500 Laramie Longhorn Crew Cab 4x4 DRW / Demco Recon Hitch on RAM Puck Ball
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02-08-2020, 10:51 AM
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#14
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Montana Fan
Join Date: Feb 2020
Location: Hawkins - Tx
Posts: 142
M.O.C. #25774
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Helping the novice.
Jeff,
Thanks for the help. I see all the options now. I haven’t done much of this so I’m not feeling very confident. Practice makes perfect I guess. I am impressed how helpful everyone is.
Thanks again.
__________________
Gunther, Sheri and Calvin
2020 Montana 3812 MS with a Reese Goosebox
2006 Dodge 3500 Dually, LB, 6 Sp, 5.9 Cummins with Flashpaq Super Chip Tuner
South Bend Flywheel and Clutch, Loadlifter 5000 Rear Air Bag Kit
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02-08-2020, 11:01 AM
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#15
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Montana Fan
Join Date: Feb 2020
Location: Hawkins - Tx
Posts: 142
M.O.C. #25774
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Dick,
Here’s the picture I was trying to send as a resume for Calvin’s job application for your “Cat Scan” Company.
__________________
Gunther, Sheri and Calvin
2020 Montana 3812 MS with a Reese Goosebox
2006 Dodge 3500 Dually, LB, 6 Sp, 5.9 Cummins with Flashpaq Super Chip Tuner
South Bend Flywheel and Clutch, Loadlifter 5000 Rear Air Bag Kit
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02-08-2020, 12:30 PM
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#16
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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Looks like he understands how to find heat so He's on the team.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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02-12-2020, 01:25 PM
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#17
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Montana Fan
Join Date: Jul 2016
Location: Georgetown
Posts: 305
M.O.C. #18751
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Dick, as we are presently in San Miguel de Allende for another month or so, and we regularly volunteer at the no kill animal shelter here, we will happily request that you send us any needs you have for your “cat scan” business. We have already fostered 6 different possible applicants this season and I can personally vouch for them and a few others that would make excellent employees.
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02-12-2020, 03:07 PM
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#18
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Established Member
Join Date: Feb 2014
Location: Emery
Posts: 49
M.O.C. #14073
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a thermostat replacement is a2 part replacement.
1 thermostat
2 mother board
should be a warrantee issue.
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02-12-2020, 03:50 PM
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#19
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Seasoned Camper
Join Date: Oct 2010
Location: Denver
Posts: 79
M.O.C. #10843
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Is it a digital, or analog thermostat?
If it's analog, it has to be the thermostat, or the heater.
If it's digital, there could be a control board somewhere else in the system.
Mine has a control board in the main A/C on the roof, and I had to replace it.
I've also had to take out my furnace to clean out wasp nests, lint, and the jet.
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02-12-2020, 07:57 PM
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#20
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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The problem has begun to return so I changed the resetable fuse and we'll see if that does the trick. If not the thermostat and control board are next on the list. Already have a spare thermostat so if we need to go further that will be next.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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