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09-23-2021, 08:12 AM
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#1
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New Member
Join Date: Sep 2021
Location: Fredericksburg
Posts: 3
M.O.C. #29702
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False zone temp reading for front AC unit
Hello Everyone!
My first post here and I'm hoping someone has an idea what could be causing this condition.
I have a 2021 Montana 3855BR Legacy with the in-command system. It appears that this years model uses Coleman Mach air units. The problem I'm having is that the front A/C unit will not turn on at all. If you select fan, auto, manual it thinks about coming on for a brief moment, then right back to off. One interesting thing to note is that the zone temp is displaying 0 degrees. The
other unit displays 74 degrees and is working.
I'd be interested to hear what everyone thinks.
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09-23-2021, 08:49 PM
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#2
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,363
M.O.C. #4831
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Bump to be seen.
__________________
Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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09-24-2021, 07:30 AM
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#3
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Montana Fan
Join Date: Nov 2020
Location: Gulfport
Posts: 105
M.O.C. #27628
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If it has worked before, I’d try :
Resetting
1) Press and hold the Power Button until the display gives you an option on screen to Power Off - press this.
2) Once the display is completely black, exit the vehicle and find the BCM.
3) Remove the cover of the BCM to expose the green board.
4) Press and hold the Reset button for 2 Seconds and let go.
5) Press and hold the Power button until the display shows light.
Step 1 and 5 is like a reboot. Try that next time. If that doesn’t work, then try the reset on the board.
__________________
2021 Montana 3231CK, Legacy, Super Solar Flex, Dual Pane Windows, Slide-out Awnings
2021 Dodge RAM 3500 4x4 Limited 6.7 HO DRW, Trailer TPMS, B&W Companion Hitch
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09-24-2021, 09:58 AM
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#4
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Established Member
Join Date: Oct 2020
Location: FLORENCE
Posts: 38
M.O.C. #27261
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You could check and see if the thermostat wiring is connection is loose. It fixed one of mine which did the same thing.
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09-25-2021, 08:26 AM
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#5
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Montana Fan
Join Date: Aug 2020
Location: Aurora
Posts: 429
M.O.C. #26926
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It is possible the wires from the remote temp sensor have come loose or broken. In the attached photo the red and white (next to each other) are the sensor wires. If resetting iNCommand doesn't work I'd check those wires at the unit (have to open up to get to the control board).
One other possibility is the wires to the Gateway (also in the unit). These are small wires in a 4 pin molex connector and I have had one that broke off at the molex.
__________________
Rip & Beth
2021 3121RL Legacy Cobalt FBP, MORryde IS & pin box
2020 F350 PSD CCLB SRW
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01-05-2024, 08:15 PM
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#6
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Montana Fan
Join Date: Apr 2010
Location: Everett
Posts: 187
M.O.C. #10319
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Opening this thread again
Hi everyone,
I want to open this thread up again. I am struggling right now with the same intermittent problem with our front AC not switching on. In-Command (which I love btw) shows 0F (sometimes other random and incorrect temperatures) – when its clearly not that temperature in the bedroom, so In-Command does not tell the AC to come on.
The dealership is unable to repro the problem, although recently when we went back to pick up the rig the problem occurred (I was happy about that) so they did see it happen. They have checked the cabling (so they say) and the thermistor – all ok. My feeling is the gateway is faulty, but unless they can “prove” its faulty, they won’t replace it.
Basically, I have been told there is no problem, if it happens again I just need to switch everything off, disconnect the battery, disconnect from shore power and then restart it all.
Frankly I find this unacceptable. Imagine being told when your car AC fails to just pull over on the freeway, switch off, wait 5 seconds and then start up and go again. Why do I have to accept this as “normal behavior”.
So (sorry for the rant) I would love to know how many people are routinely restarting their rigs to get their front ACs to communicate to In-Command.
BTW – Opened a ticket with ASA – interested to hear their take on this, hopefully get a response early next week.
Our rear AC has worked flawlessly since we had the unit (2021 3790RD Legacy).
Happy Camping!
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01-07-2024, 06:09 AM
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#7
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Montana Master
Join Date: Dec 2017
Location: Mountain Home
Posts: 839
M.O.C. #20949
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The gateway for that Zone has a relay that is intermittent ... If all the wires to the gateway are connected and no corrosion, etc on any of them then the gateway is of course the prime suspect.
The temp remote temp sensor can be tested by YOU if you have a multimeter and basic electrical skills... simply go on the roof if this is a ducted system and remove that Zone AC cover and locate the gateway and remove remote temp sensor and measure the resistance of the sensor versus the inside temp.
If the reading is within range then the sensor is ok...
If the Zone that you are having issues with is ZONE 2 then there is also an EOL... end of line resistor that tells the In Command RV-C chain that it is the last item in the loop//
If that EOL is bad ( resistance has changed ), or the EOL is loose where it plugs in at its molex plug connector then you will also have issues with that Zone
READ THIS LINK to educate yourself on the In Command RV-C for the Coleman AC units
It will also show you exactly where you will find the EOL
https://asasupportdocs.blob.core.win...3%20NCSP35.pdf
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01-07-2024, 09:34 AM
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#8
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Montana Fan
Join Date: Apr 2010
Location: Everett
Posts: 187
M.O.C. #10319
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Thanks - super helpful. The cabling and EOL resistor has (in theory) been tested, so its a simple solution in my mind, replace the gateway.
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01-07-2024, 07:39 PM
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#9
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Montana Fan
Join Date: Apr 2010
Location: Everett
Posts: 187
M.O.C. #10319
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@ChuckS - sorry - one further thought, which I wondered if you might have an opinion on. My problem is not that In-Command cannot tell the AC to run, rather the data from the gateway is erroneous, so In-Command never thinks it needs to tell the AC to come on. In my mind, the relay may be more likely to get the AC to run, nothing to do with sending the digital temperature value back to In-Command over the bus. So this would imply it is a gateway error but perhaps not specifically to do with relay? Would you agree?
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