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Old 02-05-2016, 08:40 AM   #1
Kenneth
 
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1987 34.5' Airstream 345
Waxahachie , Texas
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Help with 345 heaters!!

Hello all. I have an 1987 345 and both furnaces have stopped heating. When I turn on the thermostat the blower comes on and I can hear them click which is calling for gas but they won't ignite. The batteries are good and hot and the propane tank is full. I could sure use some help with getting them out to disassemble and clean without destroying the cabinets they are in. And then some help with what to look for once I have them out. Thanks in advance
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Old 02-05-2016, 10:19 AM   #2
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When is the last time you had the furnaces working ???
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Old 02-05-2016, 11:05 AM   #3
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If they both failed at once, are you sure that your propane regulator is working properly and all valves are open? Do the water heater and range work OK?
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Old 02-05-2016, 12:01 PM   #4
Kenneth
 
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1987 34.5' Airstream 345
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Yes the range and water heater work fine. I've had trouble with the rear heater before but usually after I turn it off and on a few times it finally works. When I tested both of them last month neither would ignite
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Old 02-05-2016, 01:05 PM   #5
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Are they Suburban furnaces? If so here is a good pdf for operation and troubleshooting.
http://www.gmceast.com/technical/Nic...an_Furnace.pdf
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Old 02-05-2016, 01:25 PM   #6
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1987 34.5' Airstream 345
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I'm not sure what brand they are. They are whatever it came with brand new. I'll look when I get home tonight. Kenneth
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Old 02-05-2016, 06:24 PM   #7
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http://bryantrv.com/docs2/docs/suburban_dd_nt.pdf

This is a better link to the maintenance and trouble shooting of the Suburban NT series furnaces. If yours are original to the rig I believe they are Suburban furnaces.


Mike
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Old 02-05-2016, 08:54 PM   #8
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No...I do not believe they are Surburban....but are probably Hydro-Flame. An exterior picture of the exhaust outlet will prove this. The hydro-flame were useless even when new that would explain why they are no longer around. However if they are Surburban, chances are that either the battery voltage is to low or the igniters need to be changed. Regards, Bob
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Old 02-06-2016, 08:51 AM   #9
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Ok they are both Duo-Therm furnaces
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Old 02-06-2016, 09:33 AM   #10
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The Duo-Therm/Hydro-Flame were junk when new....they had a problem with the burn chamber. The previous owner of my 325LE had the front one replaced with a Surburban....Took me a whole summer to Tig the exterior skin back to original after the hack job was done ! The rear furnace was not operational...I tried a complete overhaul, and finally gave up and threw it in the dumpster....I replaced it with a 30,000-50,000 Atwood. It came out real nice.
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Old 02-06-2016, 05:49 PM   #11
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1987 34.5' Airstream 345
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How did you get the unit out? The PO said they had never had used either of these. I've only used them 3-4 times since 2009. They look new and worked great when I had used them before. I was hoping it was an igniter or something simple
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Old 02-06-2016, 06:25 PM   #12
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Quote:
Originally Posted by 1987_345 View Post
How did you get the unit out? The PO said they had never had used either of these. I've only used them 3-4 times since 2009. They look new and worked great when I had used them before. I was hoping it was an igniter or something simple
Getting the furnaces out of a 345 could be referred to as a project from h*ll. They are installed at the factory fairly early in the construction phase so be prepared to take a bunch of stuff apart to get at them.

I parted out an 86 345 a couple of years ago and was amazed at what it took to get to the furnaces. No real consideration by Airstream for down the road maintenance.

I don't envy you on this at all

Brad
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Old 02-06-2016, 10:30 PM   #13
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I repaired both heaters in my 345 about a year ago.
As I remember one was a dual therm the other was a suburban. The suburban needed a new blower motor.
The duo therm needed a igniter board and a sail switch.
I do believe the suburban was an aftermarket because the exterior exhaust port was obviously redone.
I have the paper for the igniter board it came from RV parts outlet 9620 SW. Tualatin- Sherwood rd Tualatin OR.
Phone number 503-692-6044
The description on the packing slip is a dinosaur board for duo-therm U1BS the price was $89.95
I do not remember where the blower motor or the sail switch came from.
The RV and the paperwork are 90 miles from my home where I am writing this.
As I remember at the furnaces had to be unbolted from the floor, then unwired from the RV, and the gas line disconnected.
Then they slid out of the cabinet, and then I was able to work on them on a work bench.
I do remember removing the blower motor and the sales which was quite a job, even while working on the workbench, with the unit out of the camper.
But not as hard as working on the wiring under the dashboard...
But that's another story��
I wish I could be of more help, hope I was of some help.
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Old 02-07-2016, 01:45 PM   #14
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1987 34.5' Airstream 345
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Actually this is helpful. I got the front one out just now. Sail switch seems to be operating fine. Is the circuit board you referred to its sole function to control the igniter? I suppose that could be the trouble just from its age. All else appears brand new. I may call camping world and see if they have a way to test it. Thanks again for the info. Kenneth
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