iN-Command / Dometic Furnace Issue

[Happy Dad]

Our 2019 Cougar 34TSB has the iN-Command system. The trailer has the Polar Package so I thought I'd see how well the furnace performs in our Nebraska winter. The furnace will not fire. I trouble shot it and searched the web high and low.



I then called ASA Electronics, makers of the iN-Command. They informed me there is indeed a problem. The system will not work when the temperature is below 40 degrees F. They say it is an issue with a circuit on the Dometic furnace and that Keystone is very aware of the problem.


I next called my dealer and they are also starting to hear about the problem. The gentleman there who knows the most about it is on vacation so I left him a message to call me with with a status update on how Keystone plans to address the problem.



Just a heads up and stay tuned.

[Happy Dad]

Cool, somebody else from the dealer just called and said they will get a new circuit board ordered for me right away and will call me when it comes in to swap it out.

[MarkEHansen]

Is this a problem only with the 34TSB or any 2019 camper with the iN-Command system?

[Happy Dad]

From what I understand so far it is an iN-Command / Dometic issue. The board they are changing is in the Dometic unit.

[TDLyver]

Thanks for posting this. We just got our 2019 29RLD a few weeks ago. Took it out twice and temperature was above 40. Parked it until we can use after Christmas watching the temps. We have not dipped below freezing yet. After reading this went out to try and fire up the furnace, temp was reading 40 and no fire....I will be calling my dealer/tech in the morning. Will keep you all updated also.

[TDLyver]

Monday Morning Update: Plugged a space heater in and got the inside temp up to 45. Turned the furnace back on a it ran like normal. Called the dealer/service dept. and they have not heard of this issue yet. Taking it in next morning for diagnostics...I asked nicely if they could find out from In-Command and Dometic if there is a fix without dropping it off and waiting. Maybe get the board ordered before I drop it off.

[Happy Dad]

Good luck with getting yours fixed. Keystone along with iN-Command and Dometic are all definitely aware of the issue.

[ChuckS]

Too bad they went this route tying in the In Command with heating and cooling. They should have kept the CCC2 digital thermostat and left the wiring alone.

I do wish all those with issues success in getting it fixed quickly.

[bcrenshaw]

Hi everyone. First off, this forum saved me some head scratching. I could not get my brand new 2019 Cougar Half Ton 29BHS furnace to fire in 30-degree weather. The thermostat stated the temperature to be 40 degrees. The heat would not turn on. Thanks to the post in this thread, I turned on a space heater and raised the temperature to 51. I turned on the furnace and it kicked on with no issues.

[bcrenshaw]

No. I'm seeing the same thing with my 2019 29BHS.

[TRexx]

Wow, I though there was a problem with the propane. I'm glad I looked on here. I'm having the same problem with the in-command and the heat.

[TRexx]

Same problem with my 2019 Fuzion 419

[Happy Dad]

turned on a space heater and raised the temperature to 51. I turned on the furnace and it kicked on with no issues.

We used it last weekend and used a hair dryer to slowly heat the sensor on the wall. As soon as it was above 40 degrees the furnace kicked on.

My replacement part has been ordered but I have yet to hear from the dealer that it is in.

[TRexx]

Another question, did you have a recall on your electrical breaks?

[Happy Dad]

Another question, did you have a recall on your electrical breaks?

None that I am aware of.

[xrated]

There are a lot of systems on a trailer that would be great to be automated, but in my opinion.....the Heating/Cooling system isn't one of them.

[pjsorrells]

We just purchased a 2019 Cougar 32RLI, went out this morning and tried to turn the furnace on and nothing. This happened a week ago, then when it warmed up, worked fine.

Will be contacting the dealer after the holidays.

[ctbruce]

We just purchased a 2019 Cougar 32RLI, went out this morning and tried to turn the furnace on and nothing. This happened a week ago, then when it warmed up, worked fine.



Will be contacting the dealer after the holidays.What's the ambient temp where you are?

[pjsorrells]

When I tried it was below 40 degrees (SE Pennsylvania). Went over to day, same issue. This time turned the fire place on. As soon as the inside temperature hit 41 degrees the furnace fired. Talked to my dealer who contacted Keystone, waiting to hear back. Will update then

[TDLyver]

My trailer went into the dealer this morning. They were authorized to order the part first...
After using it for a good long (4-day) weekend in the heavy Oregon Coast rain, we found a few more items for them to look at and fix!

[pjsorrells]

Just got an email that they need serial number and model number for AC to order parts. Said it would be about 3 weeks to get the parts in. Will see and update.

[pjsorrells]

Just to keep you up to date on my 2019 Cougar 32RLI, Camping World emailed Keystone and this is the reply. "The gateway at the A/C must be replaced with the up-dated gateway" this is per the Dealer Service Advisor at Keystone. Waiting for part to come in then making appointment to get it replaced. Will keep you up to date with details as things happen.

[sandy43]

This post is a little confusing. The word furnace is mentioned several times along with ac/heat. Is it the heat pump or propane furnace your referring too ? Fortunately I've never had a problem with the In-Command system, I think it's cool.

[pjsorrells]

When turning the heat on the dometic furnace should fire. Apparently the controls are routed through the ac module. Sorry for the confusion. Just passing along what I'm being told.

[sandy43]

On my In-Command system, the furnace is completely different from the AC/heat controls. The furnace has a separate icon to touch. Not aware it goes through the AC controls. Hopefully one of the gure's explain this more clearly. Something new all the time.

[JRTJH]

On previous models (before In Command) the furnace and air conditioner were both "interfaced" in the A/C control unit located inside the roof mounted A/C. If the thermostat fan switch is set to HI or LOW, when the thermostat calls for heat, the furnace will ignite AND the A/C fan will turn on. BOTH fans, the furnace and the A/C will operate. That "A/C control box" is probably the same unit that was "modified for use with the In Command" system.

If so, then replacing the A/C control box in the rooftop unit will allow the thermostat to "talk to the furnace" even when the ambient temperature is below 40F....

The above is my "just a hunch" explanation. I'm guessing we'll see a "limited recall" similar to the 2015 Cougar "glass panel control switch" limited recall. The factory essentially "paid for replacement glass panels after the one year warranty expired" and on some "problematic units" replaced the glass panel with manual switches. My guess is the 40F ambient issue will be handled the same way, once Keystone and ASA Electronics figure it out and know the system works, a fix will be available for those owners who have problems, but since it's not a NHSTA safety item, a "full recall" probably won't be done....

The In Command system is a "partnered exclusive" between ASA Electronics and Keystone. ASA is also the manufacturer for Jensen, Voyager, Polk and Advent.....

[Happy Dad]

Correct the module is located in the AC unit as they need to talk together allowing the fan of the AC unit to run in unison with the heating system should you choose run it also to help spread the heat throughout the camper.

My parts came in, I talked the dealer into giving them to me to install so I don't have to have the hassle of an appointment and hauling the trailer to them to leave it.

It took me about 15 minutes to swap out the control module. Unfortunately we are have a very abnormally warm weather pattern right now and I can't test it until our temps get back below 40 degrees.

Here is the label on the box I was given.
http://www.keystoneforums.com/forums/picture.php?albumid=1066&pictureid=6001

Parts in the box but you will only replace the black module box.
http://www.keystoneforums.com/forums/picture.php?albumid=1066&pictureid=6002

You will need to get on the roof and remove the 4 Phillips screws and lift the cowling off of the AC unit. I then carefully separated the foam box housing the fan and control module. I was able to grab the two places shown by the arrows to gently pull to separate.
http://www.keystoneforums.com/forums/picture.php?albumid=1066&pictureid=6003

The arrow shows the location of the module. It is held down with strong double sided tape. I used one hand to hold down the gray box while pulling up on the module.
http://www.keystoneforums.com/forums/picture.php?albumid=1066&pictureid=6004

I noted the module I removed had the #2 toggle switched so I made sure the new module switches matched the one I removed.
http://www.keystoneforums.com/forums/picture.php?albumid=1066&pictureid=6005

While putting everything back our wonderful mouser climbed the trailer ladder and joined to supervise, lol.
http://www.keystoneforums.com/forums/picture.php?albumid=1066&pictureid=6006

I will wait to go back up and put new double sided tape on until I can verify it works below 40 degrees but all works perfect right now.

[wobly]

Outstanding writeup!

[Happy Dad]

Tested the new controller this weekend. Temp in the camper was 33 degrees and the furnace now fires right up. Now I need to wait for warmer weather to get the double sided tape on the controller :)

[MarkEHansen]

I just took our new 2019 Cougar 26RBSWE in to the dealer for it's initial warranty check-in (where we give the dealer a list of warranty items we've noticed in our first use of the trailer).

I mentioned the iN-Command / Dometic furnace issue and they said unless they can reproduce it, they can't do anything about it. I said they are not likely to reproduce it, as it's just not getting that code around here these days (Sacramento, CA). I didn't think I should have to prove that it fails by taking a camping trip to a cold location only to find that I have no heat and have to cut the trip short.

The owner of the dealership stopped by and said they can run the air conditioner in the trailer overnight - to get the temp in the cabin real cold and then try to run the furnace. Hmmm, I wonder if this will work.

I left the service manager with this request: Just please check with Keystone and if they say our unit is affected, please just replace our board.

We'll see.

[Happy Dad]

Another issue I learned of with the old board is that when the temp in the camper is over 100 degrees F the air conditioner will not turn on.

I'm thinking I may need to get another new board for the front AC unit as well, just in case.

[jimthemosaicguy]

Thanks for this post. I have a 2016 416 Fuzion and have gone thru several winters in PA with no heat. (In TX now) The inside temp would drop to 40-64 and no heat.

However, I don’t have the incommand system. Apparently, Keystone did a pre-rollout of the 2106 model then added the oncommand mid-yr. yes, I’m pissed. But, I think my unit is prewired for the incommand system on the cargo area. I’m gonna investigate.

This year I just happened to place a little space heater below the thermostat facing the sofa and set the space heater temp around 65 so the furnace would still kick in. and sure ‘nuf I haven’t had a problem since. Thought it was my imagination that the space heater actually put a bandaid on the problem.

[cbmfire]

I have a 2019 26 RBSWE with two AC units. I wonder if both boards need to be replaced!! Anyone know?

[Happy Dad]

I have a 2019 26 RBSWE with two AC units. I wonder if both boards need to be replaced!! Anyone know?

If you want the AC to turn on when the camper is over 100 degrees F you will want the second board.

Otherwise in one is needed to fix the furnace issue.

[Jseitz]

Great information!!! Thank you for posting. I just bought a Cougar 29BHS and going camping this weekend. Temps in TN are 19 degrees tonight but expected to reach low 30s at night and 60s during day over weekend. I will be sure to take an electric portable heater!

[Miloski]

Just bought a 2019 Keystone Cougar. The weather was nice so I had it camping ready instead of winterizing it. Took it out on our first trip and it snowed. We've had a week of snow and cold temps. I live on Browns Point and it rarely ever snows here and we got about a foot. I ran my heat to keep things from freezing up. I turned it of after heating it up and then it wouldn't turn back on so I had to unplug the shore power and kill the battery and then it would reset. I tried this a few time to make sure it wasn't just a fluke. The lowest the temp will go is 55 degrees. Does this sound like a similar problem?

David Seals

[pjsorrells]

Update 2019 Cougar 32RLI, New Gateway was installed in the AC unit. InCommand and Furnace are on speaking terms again. Will now show temperature below 40 degrees and heat turns on no problem. This is an issue that Keystone is aware of and is covered under the warranty.

[Jseitz]

I took my 2019 Cougar 29bh in for service yesterday morning and the temp was 36 degrees. I was able to show the CW service manager that the furnace would not run. The service manager said he had never heard of the In Command Problem. I gave him a print out of this thread for his information.

By 3:00 PM that afternoon the service manager called and told me that Keystone would take care of the problem under warranty and CW has ordered two control units for my two AC TT.

[sponge60]

Very informative post.

[tschott]

I also have a 29BHS with the same problem. Anything under 40 degrees no fan will turn on (AC or furnace). I turn on the burners on the stove for a few minutes and the furnace will fire up and run properly.
I talked to CW and they say they have never heard a thing about this...... I really have a hard time believing that they have had nobody report this in Minnesota. ??? Also, they want to charge me for parts and labor on a NEW never been used trailer.

[MarkEHansen]

Is this where you purchased the trailer? Just have them call Keystone - it's a warranty issue. If they won't help, call Keystone directly and ask for their help.

[tschott]

It is where I purchased the trailer... I will probably have to contact Keystone myself. I reported this problem to them in November 2018. They had no idea what my 2019 Cougar 29BHS had for components on it. Had no clue on what to tell me to check other than voltage. I got all the information on this problem and solution form this forum.
Does any body have a phone number for Keystone? You can PM me.

[MarkEHansen]

Just go to their web site: keystonerv.com

[wobly]

I also have a 29BHS with the same problem. Anything under 40 degrees no fan will turn on (AC or furnace). I turn on the burners on the stove for a few minutes and the furnace will fire up and run properly.
I talked to CW and they say they have never heard a thing about this...... I really have a hard time believing that they have had nobody report this in Minnesota. ??? Also, they want to charge me for parts and labor on a NEW never been used trailer.

Somebody is looking to make a few extra bucks. The dealer here wanted to play games with me and drag their feet. They even told me that they contacted Keystone and Keystone denied the problem. I called Keystone
at (866) 425-4369 and the CSR said "I can see in the system that they started a warranty claim, but they haven't finished it in the system yet. Once they do that, we will send the parts out to them.". Keystone wouldn't send the parts directly to me. Of course, I called the dealer back and "miraculously" they were able to get the gateway ordered.

They installed the gateway last week along with the Capital Grill recall. But, I told them about a third problem with the furnace not igniting at all. They missed that part of the work order and I had to prove to the Service Tech that it wouldn't work when I went to pick it up. Turns out that the control board went out on it, too, so that is being replaced under warranty.

[LHaven]

unless they can reproduce it, they can't do anything about it. I said they are not likely to reproduce it, as it's just not getting that co[ld] around here these days (Sacramento, CA). I didn't think I should have to prove that it fails by taking a camping trip to a cold location only to find that I have no heat and have to cut the trip short.

The owner of the dealership stopped by and said they can run the air conditioner in the trailer overnight - to get the temp in the cabin real cold and then try to run the furnace. Hmmm, I wonder if this will work.

Anybody else who has a dealer who suggests this, tell him right off that this will never work, by definition. The furnace side of the thermostat won't accept a setting of 100°+, where the A/C would fail to start; and the A/C side of the thermostat won't accept a setting of 40°-, where the furnace would fail to start.

[chuckster57]

Very common for me to run the AC to get the interior of the unit cool enough to operate the furnace, and in the winter it’s common for me to run the furnace to warm it up enough to operate the AC.

[LHaven]

Sure, but... the furnace isn't going to get the coach up to 100° and the A/C isn't going to get it down to 40°... and you can't exhibit the gateway unit failure unless you exceed that range.

[chuckster57]

I forgot this is an “in command” issue. Starting to be happy we don’t deal with that system, enough troubles dealing with ASA and their radios.

[LHaven]

Not sure inCommand is needed to trigger this issue, unless the Dometic gateway that causes the problem isn't present on non-inCommand units. I understood these gateways were also used for traditional thermostat setups.

[wobly]

The gateways might be used in traditional thermostat setups, but I know that specifically, the issue for this is tied to a new version of the gateway instead of what was installed from the factory.

[ChuckS]

The AC and Furnace on systems using CCC2 digital thermostat ... non In Command also use the CANBUS to communicate .... ALL inputs must go thru Zone 1 AC electronic control module. The furnace is tied into Zone 1 ECM to receive its signals across the CANBUS from the thermostat.

[Rall01]

I'm going to buy the raptor 423, i guess i need to talk with the dealer before i close the deal, thank you everybody for your help.

[ptooti]

How would I know if I have this thermostat? is there a way to identify it? Thanks in advance

[Old soldier]

Our 2018 Montana HC 31re furnace had a brain cramp in Texas our first trip. Furnace would kick in-off-on-off. 32 degrees outside, so we turned on the fireplace. Called a mobile tech who found Keystone used a resetting 12v fuse. They don’t work well anyhow, but too much heat and drain so close to the fuse. I popped in a standard 12v faze and it worked flawlessly. For a while. Tech eventually swapped out the entire panel (not the converter). No issues after that. Came across a family with a brand new 40+ footer....no electrics worked. They sorta slept in the closed kitchen that night and left the next morning. Keystone has too many construction/quality control issues for me. After owning a KZ, I’m aware any company will have problems. After restoring a 1964 Fireball Meteor, I’m confident I can work on many things in campers. But electronics and electricals can be daunting! The Keystone TV lash up is totally screwed up. Couldn’t get/hold a Dishnetwork signal. Turned out Keystone used splitters....something that will not, can not work. Now have dedicated lines directly from the two TV in terminals to two of the three TVs (why anyone wants three TVs escapes me.. ..why they need one in the belly is laughable). Our dealer, Camping world in Marshfield, MO ate roughly $2,400.00 fixing all that plus other items. A dealers shouldn’t be “the last ten feet” of an assembly line as one dealer put it! Montanas aren’t extremely expensive, but they cost too much for the headaches we receive after pickup. Fewer issues with our Cougar.

[HeadShed]

Our 2018 Montana HC 31re furnace had a brain cramp in Texas our first trip. Furnace would kick in-off-on-off. 32 degrees outside, so we turned on the fireplace. Called a mobile tech who found Keystone used a resetting 12v fuse. They don’t work well anyhow, but too much heat and drain so close to the fuse. I popped in a standard 12v faze and it worked flawlessly. For a while. Tech eventually swapped out the entire panel (not the converter). No issues after that. Came across a family with a brand new 40+ footer....no electrics worked. They sorta slept in the closed kitchen that night and left the next morning. Keystone has too many construction/quality control issues for me. After owning a KZ, I’m aware any company will have problems. After restoring a 1964 Fireball Meteor, I’m confident I can work on many things in campers. But electronics and electricals can be daunting! The Keystone TV lash up is totally screwed up. Couldn’t get/hold a Dishnetwork signal. Turned out Keystone used splitters....something that will not, can not work. Now have dedicated lines directly from the two TV in terminals to two of the three TVs (why anyone wants three TVs escapes me.. ..why they need one in the belly is laughable). Our dealer, Camping world in Marshfield, MO ate roughly $2,400.00 fixing all that plus other items. A dealers shouldn’t be “the last ten feet” of an assembly line as one dealer put it! Montanas aren’t extremely expensive, but they cost too much for the headaches we receive after pickup. Fewer issues with our Cougar.



On off on off on furnance can be from the propane tank being too cold. Vapor pressure is too low to sustain lit furnance.

[LHaven]

On off on off on furnance can be from the propane tank being too cold. Vapor pressure is too low to sustain lit furnance.


That made me curious. How do you remedy that situation? An electric blanket?

[HeadShed]

That made me curious. How do you remedy that situation? An electric blanket?


Heat source for the tanks. Optimally in a built enclosure;

Options:
Heat cord
Fish tank mat

If you have a heated underbelly you can build a small air conduit to an enclosure on your tanks

[Rdynbama]

We have a 2019 Raptor 356 toy hauler with the N command system
I can’t find an icon on it for the furnace
It’s going back to the dealer on the 17th of this month with a host of other issues
I’m gonna add this to the list!😒

[LHaven]

The furnace and air conditioner both show up under "HVAC."

[Rdynbama]

I went to HVAC but could only find the three AC’ s
Nothing for the furnace

[LHaven]

When you're in HVAC, the left-hand circle gives you a choice between air conditioning, heat, fan, auto climate control, and off.

[Rdynbama]

Ok I’ll look again when I get home
Thank you

[Rdynbama]

L Haven Thank you
I found it right where you said it was and it works fine now
When/if it gets cold here in south Alabama I’ll check it again

[Canza_Goldens]

Was it just the thermostat you needed to warm up right on the wall? I might be fighting a battle I cannot win.. it is presently 1f and I need to get the trailer I guess to 40F before the furnace will kick in... so if I can get the heat directly onto what I need to I might be able to get the furnace to turn on. SIGH

[LHaven]

Was it just the thermostat you needed to warm up right on the wall? I might be fighting a battle I cannot win.. it is presently 1f and I need to get the trailer I guess to 40F before the furnace will kick in... so if I can get the heat directly onto what I need to I might be able to get the furnace to turn on. SIGH

Known problem with Dometic HVAC interface. (http://www.keystoneforums.com/forums/showthread.php?t=36600) Fixable under warranty if not expired.

[Canza_Goldens]

Known problem with Dometic HVAC interface. (http://www.keystoneforums.com/forums/showthread.php?t=36600) Fixable under warranty if not expired.

Yes that is the plan for Monday morning (I already called and of course service is closed on weekends) BUT... I would like to get the furnace going today if possible... so was wondering what part to put heat directly onto

[LHaven]

You'd have to put heat onto the thermistor, which at least in my rig is not in either the Dometic gateway or the inCommand display module. It's in a small black plastic bumpout on the wall opposite the display. Look for a raised circle about 1.5" wide.

[Canza_Goldens]

You'd have to put heat onto the thermistor, which at least in my rig is not in either the Dometic gateway or the inCommand display module. It's in a small black plastic bumpout on the wall opposite the display. Look for a raised circle about 1.5" wide.

Thankfully I figured it out a few hours ago! Its up to 59F now! Hopefully it stays running all night! Thank you!

[JD2019Cougar5]

Correct the module is located in the AC unit as they need to talk together allowing the fan of the AC unit to run in unison with the heating system should you choose run it also to help spread the heat throughout the camper.

My parts came in, I talked the dealer into giving them to me to install so I don't have to have the hassle of an appointment and hauling the trailer to them to leave it.

It took me about 15 minutes to swap out the control module. Unfortunately we are have a very abnormally warm weather pattern right now and I can't test it until our temps get back below 40 degrees.

Here is the label on the box I was given.
http://www.keystoneforums.com/forums/picture.php?albumid=1066&pictureid=6001

Parts in the box but you will only replace the black module box.
http://www.keystoneforums.com/forums/picture.php?albumid=1066&pictureid=6002

You will need to get on the roof and remove the 4 Phillips screws and lift the cowling off of the AC unit. I then carefully separated the foam box housing the fan and control module. I was able to grab the two places shown by the arrows to gently pull to separate.
http://www.keystoneforums.com/forums/picture.php?albumid=1066&pictureid=6003

The arrow shows the location of the module. It is held down with strong double sided tape. I used one hand to hold down the gray box while pulling up on the module.
http://www.keystoneforums.com/forums/picture.php?albumid=1066&pictureid=6004

I noted the module I removed had the #2 toggle switched so I made sure the new module switches matched the one I removed.
http://www.keystoneforums.com/forums/picture.php?albumid=1066&pictureid=6005

While putting everything back our wonderful mouser climbed the trailer ladder and joined to supervise, lol.
http://www.keystoneforums.com/forums/picture.php?albumid=1066&pictureid=6006

I will wait to go back up and put new double sided tape on until I can verify it works below 40 degrees but all works perfect right now.
Hi Happy Dad,
Thank you so much for your in depth post. I did not see the original issue. My 2019 cougar has a problem with the AC relay clicking when the heat comes on, and the heat short cycling. Was this similar to your issue?

Thanks again

[barterry46]

Thank you for this posting. We are picking up our brand new 2020 cougar with InCommand, so we will try to see what happens, if possible in Texas weather, when we attempt to start the furnace as part of our pre-check at dealership. ( Have quite a list to run systems etc.)

[Robertk]

have you figured out where the circuit board is located? I'm trying to replace mine myself

[wobly]

have you figured out where the circuit board is located? I'm trying to replace mine myself
What circuit board are you referring to? The gateway (black box with wires going into it) is in the A/C unit itself.

[tdijet]

For anyone needing to use their furnace or AC while awaiting to get into service or parts. It actually does not have anything to do with the actual air temp, but appears to be more about the sensor reading.

I have a Fuzion 357 and have the AC issue when sensors read over 100 degrees. Assuming this same work around is effective for Furnace issues when reading under 40 degrees.

Locate the sensor for the room you wish to activate, then hold an ice pack to it to cool down the sensor. Once you get a reading 99 degrees or lower, you will be able to activate the AC unit. I used the above method yesterday to get all 3 units running on generator power.

Sensor Unit:
https://www.gonewiththewynns.com/wp-content/uploads/2014/07/15A9737.jpg

Keystone was not any help and simply deferred to contact a service center. No matter how much detail I gave them. I needed the above work around as the soonest I can get into a service center is October :facepalm:

[LHaven]

I have a Fuzion 357 and have the AC issue when sensors read over 100 degrees. Assuming this same work around is effective for Furnace issues when reading under 40 degrees.

Keystone was not any help and simply deferred to contact a service center. No matter how much detail I gave them. I needed the above work around as the soonest I can get into a service center is October :facepalm:

This is a known recall issue. The culprit is the Dometic HVAC gateway unit located in your AC well. It needs to be replaced with a different model that does not have this bug. (https://www.keystoneforums.com/forums/showthread.php?t=36600)

[tdijet]

Exactly, unfortunately I’m 2 months out from a service opening. Figured this would be helpful to anyone stuck like I am in summer until the fix can be applied.

[HAIR FARMER]

Our 2019 Cougar 34TSB has the iN-Command system. The trailer has the Polar Package so I thought I'd see how well the furnace performs in our Nebraska winter. The furnace will not fire. I trouble shot it and searched the web high and low.



I then called ASA Electronics, makers of the iN-Command. They informed me there is indeed a problem. The system will not work when the temperature is below 40 degrees F. They say it is an issue with a circuit on the Dometic furnace and that Keystone is very aware of the problem.


I next called my dealer and they are also starting to hear about the problem. The gentleman there who knows the most about it is on vacation so I left him a message to call me with with a status update on how Keystone plans to address the problem.



Just a heads up and stay tuned.
HAPPY DAD
I have exact same issue with my 2019 30LRS
I did open ext furnace access cleaned sail switch
And reset furnace THEN she fired up.... however
Thermostat fails to respond to drop in temp and
Propane dose not ignite.... very frustrating... thx
Your post HD.... comforting .... holiday today in
Canada But I’ll contact my dealer tomorrow!!!

[Charlie405]

My 2019 cougar 310, seems to have this issue. I went to turn the furnace on to do some work inside the unit, and the furnace would not start. The fan would not come on either. I removed the cover outside to check the light on the furnace board, and nothing. Took it to the dealer, they said to run unit with the fan in auto, and unit ran fine, if course, they brought it inside, and it was warm. Picked it up, tried it and unit seemed to work. Next day went to start the furnace to do the work inside, and would not start again... Will be calling dealer and mention what has been said here. They don't believe me....

[David Hernandez]

I have a 2020 Alpine 3400rs with a Dometic furnace 35121. Attempting to use my furnace in 60° temps to see of it works. Furnace lights up as advertised for about a minute and half then shuts down. I can hear the fan blowing but no burner activity. Exhaust is free and clear of debris.

I've heard it could be a Sail Switch issue, a thermostat issue , and also read to switch out the 15amp resetable fuse panel fuse with a standard 15amp fuse.

Question, since it does start and run what I believe to be correctly for the minute and half, is it a motherboard issue????

[LHaven]

Your posting is ambiguous. You say it "lights up as advertised," then you say you "can hear the fan blowing but no burner activity." Which is it?

[ChuckS]

With the number of posts I’ve seen in the last few months with Atwood furnace...and that’s what he’s got it’s a good bet the sail switch isn’t completing circuit.

All the OP heard was blower motor run and then furnace lock out after 3 failed attempts.

The sail switch on these late model Dometic/Atwood furnaces is pure junk

[the_owl]

Correct the module is located in the AC unit as they need to talk together allowing the fan of the AC unit to run in unison with the heating system should you choose run it also to help spread the heat throughout the camper.

My parts came in, I talked the dealer into giving them to me to install so I don't have to have the hassle of an appointment and hauling the trailer to them to leave it.

It took me about 15 minutes to swap out the control module. Unfortunately we are have a very abnormally warm weather pattern right now and I can't test it until our temps get back below 40 degrees.

Here is the label on the box I was given.
https://www.keystoneforums.com/forums/picture.php?albumid=1066&pictureid=6001

Parts in the box but you will only replace the black module box.
https://www.keystoneforums.com/forums/picture.php?albumid=1066&pictureid=6002

You will need to get on the roof and remove the 4 Phillips screws and lift the cowling off of the AC unit. I then carefully separated the foam box housing the fan and control module. I was able to grab the two places shown by the arrows to gently pull to separate.
https://www.keystoneforums.com/forums/picture.php?albumid=1066&pictureid=6003

The arrow shows the location of the module. It is held down with strong double sided tape. I used one hand to hold down the gray box while pulling up on the module.
https://www.keystoneforums.com/forums/picture.php?albumid=1066&pictureid=6004

I noted the module I removed had the #2 toggle switched so I made sure the new module switches matched the one I removed.
https://www.keystoneforums.com/forums/picture.php?albumid=1066&pictureid=6005

While putting everything back our wonderful mouser climbed the trailer ladder and joined to supervise, lol.
https://www.keystoneforums.com/forums/picture.php?albumid=1066&pictureid=6006

I will wait to go back up and put new double sided tape on until I can verify it works below 40 degrees but all works perfect right now.

Hi there, does anyone have the part number to order from trekwood for this? I have a fuzion 419 with three ACs. Which AC unit would this part be in? thanks

[LHaven]

It took me about 15 minutes to swap out the control module. Unfortunately we are have a very abnormally warm weather pattern right now and I can't test it until our temps get back below 40 degrees.

My dealer couldn't figure this one out either, and he's a "professional."

You can buy an aerosol can of "freeze spray" -- or if you have "canned air" (computer duster) you can turn it upside down and get the same effect. Just spray it on your temperature sensor and you can make your thermostat think it's as cold as you want. To test your air conditioner, use a hairdryer instead.