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Old 06-11-2015, 02:24 PM   #1
TonyG
 
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Furnace operation at 7000' on 2015 Classic

We just purchased a new 2015 Classic a few weeks ago and did the first "shakedown" trip with it this past weekend. We camped up in the mountains at a 7000 foot elevation.

The primary problem we encountered with the new unit was that the Gas Furnace would not stay ignited at this elevation even though it worked fine down in the desert at 2000 feet. It would ignite for 3-4 seconds then go out followed by another similar cycle after Approx. 30 seconds and repeat over and over again. The thermostat was set far above the internal temperature at the time. All of other gas appliances worked fine including the Hot Water Heater. I'm guessing it's probably a fuel/air mixture problem. Has anyone encountered this, and if so, where can you adjust this or how did you solve the problem?

I also spoke with the Atwood (the furnace manufacturer and they also indicated a regulator adjustment (external to the furnace) would be needed for elevations over 4500 feet.

Any help would be greatly appreciated.
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Old 06-11-2015, 03:00 PM   #2
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At one time about 10 to 15 years ago furnace and water heater makers said their equipment would not work above xxxx feet, usually in the 7000' range. That didn't go down well with western campers, and it seemed to quietly disappear from their manuals. I have not heard much about it lately, so I thought they had solved the issue. I know that I have not had it up to about 8000' in my rigs.

I will be interested to see what others say about it.
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Old 06-11-2015, 03:35 PM   #3
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We have a 2014 30' BH and the furnace works perfectly at our house, which is right at 8K feet in Colorado. Purchased from a Detroit dealer, and I can assure you that they didn't do anything to prepare it for our altitude.
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Old 06-11-2015, 03:47 PM   #4
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I'll bet your regulator is set low. Mine was.
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Old 06-11-2015, 04:32 PM   #5
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Quote:
Originally Posted by dznf0g View Post
I'll bet your regulator is set low. Mine was.
So how do you fix it?
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Old 06-11-2015, 05:39 PM   #6
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You have to get a low pressure gauge. Install it at the stove with the proper fittings. Turn on all the rest of the gas appliances and adjust the regulator to 11 inches. The adjustment screw is under a black cap on the regulator.
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Old 06-11-2015, 05:54 PM   #7
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Thanks for the help.

Since my original post, I had found an information tag attached to the regulator at the propane tanks that contained a short statement on how to adjust the pressure as you had described which led me to the conclusion that this may very well fix the problem.

Once you have adjusted it to 11 inches, will it work at lower elevations (say down to a 1000') or is this something you kind of have to tweek depending on the elevation you are at?
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Old 06-11-2015, 06:59 PM   #8
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Should be fine at both. I adjusted mine when I got home from the Rockies, but haven't been back yet.
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Old 06-11-2015, 07:16 PM   #9
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I was in North Rim Grand Canyon today and ran the furnace fine at 8200ft. I wonder if only the new furnaces have this limitation. I doubt the previous owner of my AS left Austin, TX during the years they owned it.

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Old 06-11-2015, 07:48 PM   #10
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Replace regulator. You can have it tested for proper "pressure"...before but easier to change... Compare the flame output in stove to "before/after".... Our was "low pressure" until replaced....
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Old 06-11-2015, 09:11 PM   #11
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But I'm not confident they are properly calibrated off the shelf
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Old 06-12-2015, 09:19 AM   #12
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Tony I am having the same issue and not just at higher elevations. Already deep into trouble shooting. Pretty simple system and getting into a local service center, well there are 8-10 week waits. Here's what I have found so far.

1. This is new furnace from Atwood and no one has manuals or parts.
2. Attaching the manual to this post.
3. Found that the electrode (starts and checks for flame) was misadjusted by 5mm. Carefully adjusted that.
4. Replaced the main circuit board.
5. Checked pressure. Was too high by 3 inches. Replaced pressure regulator with a Marshall.

This did not fix the issue.

Talked with Atwood, good support though you may be on hold for awhile. They are sending a new electrode. The electrode, besides being the spark for ignition, senses heat. If it has failed or is failing then it says to the board no heat after start and shuts down the gas solenoid. Then goes into a 15 second restart cycle.

If that fixes it great. If not really the only other thing easily replace is the the limit switch when senses and over temp. Again if it is failing that too could shut off the solenoids.

Never had a problem at higher elevations with my 2014 FC25. And coming back from Colonial to Colorado don't remember an issue.

And as I mentioned I've called a Camping World and another local Atwood dealer and they don't even have a manual nor parts/numbers or prices at this point.

Will post again if I get it fixed and reliable. Last resort will be an early fall trip back to Jackson Center.

Atwood Furnace 2015.pdf
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Old 06-12-2015, 09:24 AM   #13
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Quote:
Originally Posted by ghaynes755 View Post
Tony I am having the same issue and not just at higher elevations. Already deep into trouble shooting. Pretty simple system and getting into a local service center, well there are 8-10 week waits. Here's what I have found so far.

1. This is new furnace from Atwood and no one has manuals or parts.
2. Attaching the manual to this post.
3. Found that the electrode (starts and checks for flame) was misadjusted by 5mm. Carefully adjusted that.
4. Replaced the main circuit board.
5. Checked pressure. Was too high by 3 inches. Replaced pressure regulator with a Marshall.

This did not fix the issue.

Talked with Atwood, good support though you may be on hold for awhile. They are sending a new electrode. The electrode, besides being the spark for ignition, senses heat. If it has failed or is failing then it says to the board no heat after start and shuts down the gas solenoid. Then goes into a 15 second restart cycle.

If that fixes it great. If not really the only other thing easily replace is the the limit switch when senses and over temp. Again if it is failing that too could shut off the solenoids.

Never had a problem at higher elevations with my 2014 FC25. And coming back from Colonial to Colorado don't remember an issue.

And as I mentioned I've called a Camping World and another local Atwood dealer and they don't even have a manual nor parts/numbers or prices at this point.

Will post again if I get it fixed and reliable. Last resort will be an early fall trip back to Jackson Center.

Attachment 240491
3" too high with all gas appliances on or off? 14" is just about right with all the appliances off. I adjusted to 11" with everything (but the stove, since that's where the gauge is installed) on. After shutting everything off I have 14" static pressure.
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Old 06-12-2015, 09:28 AM   #14
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Here's a step by step procedure:

How to Measure Propane Regulator Pressure | eHow
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