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06-15-2019, 09:42 PM
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#1
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Junior Member
Join Date: Jun 2019
Posts: 3
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Coleman Furnace Cycling Problem
Hello, I’m having an issue on my rv furnace but can’t seem to find any answers so I am hoping someone here has some insight so thanks in advance.
I have a 2009 Chaparral fifth wheel with a Coleman Mack furnace and air conditioner on a CM analog thermostat.
The furnace comes on and cycles every so often on it’s own, regardless of the thermostat setting, even with the air conditioning running. It runs its dc fan and the igniter ticks. It will light and run if the propane is on. I can stop it from cycling by pulling the 10amp fuse or flipping the switch on the side of the furnace itself. Both pulling the fuse or flipping the switch also prevents the air conditioning from running. Unplugging the harness on the furnace also prevents the air conditioning from running so I am unable to isolate just the furnace and shut it off. I do not have a model number for the furnace and have not seen a tag. There is also no independent propane shut off valve. Has anyone had this issue before?
Thanks again
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06-15-2019, 10:10 PM
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#2
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Senior Member
Join Date: Jan 2017
Location: KS
Posts: 2,369
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I am not really an HVAC guy but that sounds like it is wired wrong if it really is the Coleman thermostat. What's it look like? I posted a picture of mine. If like this something is very wrong as there is no way to run the heat and ac at the same time.
I have heard the dometics do this and it is something to do with how you set it but I dont have one.
The analog thermostats are junk anyway with a 8 degree swing so I swapped mine for digital.
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06-15-2019, 11:35 PM
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#3
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Senior Member
Join Date: Jan 2015
Location: West Michigan
Posts: 641
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Remove the thermostat from the sub base. The wiring terminals for the t stat should be there. remove the white wire from the W terminal and put some tape on the wire so it dose not short out to other terminals. The white wire is for the furnace and should keep it starting. Put thermostat back together. If the furnace dose start the thermostat wire to the furnace is shorting together and needs to be replaced or find the short. If the furnace dose not start then the thermostat is junk and needs to be replaced. My bet is on the wiring being shorted.
Hope This Helps Tim
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06-15-2019, 11:44 PM
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#4
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Senior Member
Join Date: Jun 2012
Posts: 10,907
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I'd replace the analog CM T-stat with a digital CM T-stat. Wiring is like-for-like. So you can check the wiring when you replace it. Wiring should be:
R - Red (+12VDC)
Y - Yellow (power to AC)
W - White (power to furnace)
GL - Gray (power to AC fan - low speed)
GW - Green (power to AC fan - hi speed)
B - Blue (ground)
You'll be a LOT happier with a digital over an analog.
Here's one:
https://www.amazon.com/d/Programmabl...tat/B01M8LFHT3
Here's another:
https://www.rvupgradestore.com/Singl...at-p/69845.htm
__________________
1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
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06-16-2019, 08:38 AM
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#5
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Junior Member
Join Date: Jun 2019
Posts: 3
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Thank you all for your help. I’m going to order a digital thermostat, like you all recommend and I’ll update the thread with the result.
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06-16-2019, 08:47 AM
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#6
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Junior Member
Join Date: Jun 2019
Posts: 3
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Thanks Tim, I’m going to try that test first. Hopefully it’s not the wire, running a new one through the walls and ceiling will be tough.
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06-16-2019, 03:44 PM
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#7
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Site Team
Join Date: Jan 2007
Location: Goodyear, Arizona
Posts: 33,598
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I didn't know Coleman made RV furnaces, just the thermostat.
__________________
Dan-Retired California Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity
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06-16-2019, 04:35 PM
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#8
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Just as confused as you
Join Date: Aug 2013
Location: south central Wisconsin
Posts: 5,108
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CincyAJ
Coleman does't make furnaces. Find the fresh air return for the furnace and remove the grill. Inside you will see the furnace, on one of the sides or the top of the furnace you will find the tag for the furnace. My TT has the Coleman Mach air conditioner and the Coleman analog thermostat. My furnace is a Suburban SF-30Q. The tag is on top and I used my cell phone to read the label or you could use a mirror to read it.
__________________
Richard & Jill
2014 Flagstaff 832IKBS Classic Super Lite
2018 Silverado 1500 Crew Cab Z71 4WD All Star Edition
Camping since 1989, Seasonal since 2000.
Car Shredder Op/Tech, Scrap Metal Recycling - retired
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06-16-2019, 06:42 PM
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#9
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Senior Member
Join Date: Aug 2013
Posts: 7,916
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May just be a crazy stat. The heat and a/c are separate circuits in the stat. I would carefully disconnect the stat wires on each end and ohm the wires on the highest setting. Any continuity would indicate a short.
My suspicion is either a crazy stat or mice.
__________________
2017 Puma 297RLSS
2005 Ram 2500 4X4 diesel SMOKER!!
I love puns, irony and tasteless jokes...
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