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Old 06-14-2021, 05:36 PM   #1
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2020 33' Classic
Hobe Sound , Florida
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Classic 33-loud bang, both ACs quit, smoke…

We just had a loud bang/boom/popping sound happen in our 2020 Classic 33. Both air conditioners shut down and smoke came from under the sofa. We were planning to stay in the Airstream tonight but changed our plan. We had set up at a state park just a couple of hours earlier and everything was working fine.
What is under the sofa that would make that sound and then shut off acs and fill unit with smoke? No breakers were tripped and power to everything else works. Air conditioners won’t come back on.
Thanks for any thoughts.
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Old 06-14-2021, 06:05 PM   #2
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Do you smell a sulfur smell? Sounds like a battery shorted internally and exploded. The AC controls need 12v. Does your thermostat display normally?

That smoke might be vaporized sulfuric acid (the battery's electrolyte). Be careful.

Open the battery box access hatch. If you see spilled liquid or jell, remove the battery if you can. Get some baking soda and pour it liberally on/around the wet areas. This will neutralize any spilled acid.

Or, it could be some other type of electrical short circuit.
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Old 06-14-2021, 06:15 PM   #3
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Hi

The other thing that is up in the front of the trailer is the master DC bus. Various odd failures could occur there.

Bob
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Old 06-14-2021, 06:46 PM   #4
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The Converter failed in our 2020 25 Foot Flying Cloud. It didn't pop, but nothing requiring 120v would run after that. Only things that would run where those that ran off the batteries.

You said everything works? Does that include the Microwave too?
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Old 06-14-2021, 06:47 PM   #5
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That sucks! I'm not familiar with the 2020's and what's under the couch, is there a power center where both the 120v breakers and 12v fuses are? It sounds like something shorted, since both AC's went down I'd start looking on the control (12v) side.
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Old 06-14-2021, 07:29 PM   #6
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Hobe Sound , Florida
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Thank you all for your responses. There was no sulfur smell but it was a weird chemical like smell. The distance between the batteries and the smoke/ boom sound is too great to be the problem I think. The thermostat displays normally. The microwave/convection oven did not lose power. I did check breakers and none were tripped. Not sure what to look for at the fuses.
We already have appointment for other repairs on Monday so this will be added to the list.
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Old 06-14-2021, 07:59 PM   #7
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Quote:
Originally Posted by Jenturnr View Post
Thank you all for your responses. There was no sulfur smell but it was a weird chemical like smell. The distance between the batteries and the smoke/ boom sound is too great to be the problem I think. The thermostat displays normally. The microwave/convection oven did not lose power. I did check breakers and none were tripped. Not sure what to look for at the fuses.
We already have appointment for other repairs on Monday so this will be added to the list.
Hi

Loud boom is never a good thing. Loud boom with no tripped breakers is a bit weird.

Do you have an EMS on your trailer? That would rule out several things.

Bob
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Old 06-15-2021, 04:23 AM   #8
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The nose knows?

Good suggestions Bob.

Jenni . . . can you see under the couch . . . have you looked inside the trailer everywhere you can see? Was the smell anything like the acrid smell of a burned electrical transformer?

Any residual smell this morning, to which your noses can lead you?

Good luck,

Peter
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Old 06-15-2021, 06:19 AM   #9
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Here is the likely problem at I have been in several of these units. The DC distribution panel/box is located under the center section of the couch.
You can easily access this area by removing this section of the couch.
To remove the center section simple pull the front section off. It is just help in place with a couple of clips.
Once the front is off there are two 3/4” nuts holding the seat area of the section to the couch frame.
Once those two nuts are removed the center section of the couch can be lifted away.
Be careful as this section is not light weight and there are some sharp edges on the bottom that could cause damage it it “gets away for you”
Once the center section is removed you now have access to the famous “Rats Nest”.
Now you can start to look for the culprit
Everything in this area it on ShortStop thermal fuses after the main inputs.
Here is my best educated guess.
There are a few wires that are always “hot” on the Classic. (This helps contribute to them being power HOGS). Things like Propane leak detector, Refrigerator control board, trailer brakes, some C Zone systems). In always Hot I mean not affected by the “Store/Use Switch”
You likely problem is the “ some C Zone systems wire” has likely shorted out either against a grounded item (Alde fin, trailer skin, couch frame ect).
This would cause you to lose power to the AC’s and not other items.

You Mission should you choose to accept it, is to find this wire and repair the “Short”
Good Luck!
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Old 06-15-2021, 08:47 AM   #10
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Thumbs up

Great comment thanks.

Peter
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Old 06-15-2021, 09:34 AM   #11
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Box Elder , South Dakota
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"As alway, Jim, ....

Should you or any of your IM Force be caught or killed, the Secretary will disavow any knowledge of your actions. This tape/disc will self-destruct in five/ten seconds. Good luck, Jim."

CLASSIC TV quote. Mission Impossible.
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Old 06-15-2021, 10:42 AM   #12
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2020 33' Classic
Hanover , Pennsylvania
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To access under the couch you need to raise the leg rests. You will be able to see under there. There is a speaker under the left seat looking at the couch. The noise probably came from behind the fuse and breaker panel. All the cushions will come off by hand.
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Old 06-15-2021, 11:00 AM   #13
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Quote:
Originally Posted by GMFL View Post
Here is the likely problem at I have been in several of these units. The DC distribution panel/box is located under the center section of the couch.
You can easily access this area by removing this section of the couch.
To remove the center section simple pull the front section off. It is just help in place with a couple of clips.
Once the front is off there are two 3/4” nuts holding the seat area of the section to the couch frame.
Once those two nuts are removed the center section of the couch can be lifted away.
Be careful as this section is not light weight and there are some sharp edges on the bottom that could cause damage it it “gets away for you”
Once the center section is removed you now have access to the famous “Rats Nest”.
Now you can start to look for the culprit
Everything in this area it on ShortStop thermal fuses after the main inputs.
Here is my best educated guess.
There are a few wires that are always “hot” on the Classic. (This helps contribute to them being power HOGS). Things like Propane leak detector, Refrigerator control board, trailer brakes, some C Zone systems). In always Hot I mean not affected by the “Store/Use Switch”
You likely problem is the “ some C Zone systems wire” has likely shorted out either against a grounded item (Alde fin, trailer skin, couch frame ect).
This would cause you to lose power to the AC’s and not other items.

You Mission should you choose to accept it, is to find this wire and repair the “Short”
Good Luck!
How would any of this affect the Air conditioner's. They run on AC not on DC. Were the ACs running on batteries through an inverter? No mention of this. I would think that the AC side would be separate of the DC side as it is my 07 Classic. It would be interesting to know how AS wired the new units. Too bad we've all departed from the KISS principle.
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Old 06-15-2021, 11:09 AM   #14
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Question

Quote:
Originally Posted by gator.bigfoot View Post
How would any of this affect the Air conditioner's.
. . .
Hasn't he answered that?



Quote:
Originally Posted by GMFL View Post
Here is the likely problem at I have been in several of these units. The DC distribution panel/box is located under the center section of the couch.
. . .
. . . There are a few wires that are always “hot” on the Classic.
. . .
. . . Things like . . . some C Zone systems . . .
. . .
. . . You likely problem is the “some C Zone systems wire” has likely shorted out either against a grounded item (Alde fin, trailer skin, couch frame ect).
. . .
. . . This would cause you to lose power to the AC’s and not other items.
. . .
[emphasis added above]

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Old 06-15-2021, 11:37 AM   #15
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Quote:
Originally Posted by gator.bigfoot View Post
How would any of this affect the Air conditioner's. They run on AC not on DC. Were the ACs running on batteries through an inverter? No mention of this. I would think that the AC side would be separate of the DC side as it is my 07 Classic. It would be interesting to know how AS wired the new units. Too bad we've all departed from the KISS principle.

The control system for the AC's (CZONE) runs off of 12v DC. Considering both AC's stopped working after the pop, I'd say it's something on the controls side vs. the high voltage side. I believe each AC is on separate breakers - that would take something to cause the 120V on both AC's to go down at the same time.
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Old 06-15-2021, 12:26 PM   #16
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Please see Post #14.
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Old 06-15-2021, 02:18 PM   #17
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Following...

Please post the solution once you find it.
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Old 06-16-2021, 11:34 AM   #18
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I had no idea what C Zone was. I had to look it up. I guess the days of keeping it simple are gone. Just like my new car trailers companies have subscribed to this new ideology. What was right is now left and what was wrong is now right. We put computers into fridges and washing machines and a whole lot more and we wonder when it goes wrong.

I've spent a lifetime working in the electronic/computer field and we currently working on making EV products for numerous automotive companies. The more I work in it the more I'm convinced that is not the way to go. We build in obsolescence and create unreliability by taking something simple and making it as complex as we can. I often wonder how will the customer every be able support what we deliver. I guess it's a business opportunity for someone. But for the consumer it's a nightmare.

As for the poster I hope you have a warranty on the product. If not, to diagnose it your biggest clue was the smoke. Be thankful you had smoke, you can follow the putrid smell that it created.
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