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Open Roads Forum  >  Class C Motorhomes  >  Class C

 > Furnace black smoke

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Holiday27

Gresham, OR.

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Posted: 10/03/22 12:20pm Link  |  Quote  |  Print  |  Notify Moderator

wolfe10 wrote:

OR a rusted/damaged burner or perhaps a mud dubber has set up housekeeping.

Either will disrupt the fuel/air mixture, same as improper propane pressure.


Yeah, I went through all that, even replacing the burner components. It's got to be the propane regulator....
Thanks for the feedback!


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Holiday27

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Posted: 10/03/22 12:23pm Link  |  Quote  |  Print  |  Notify Moderator

bgum wrote:

Please let us know the outcome. I am convinced it is air in-out-or both.


Will do, funny how the fridge and cook top work fine though. Im guessing im not getting enough gas pressure to the furnace but who knows.... Thanks for the info!

bobndot

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Posted: 10/03/22 03:09pm Link  |  Quote  |  Print  |  Notify Moderator

Holiday27 wrote:

wolfe10 wrote:

OR a rusted/damaged burner or perhaps a mud dubber has set up housekeeping.

Either will disrupt the fuel/air mixture, same as improper propane pressure.


Yeah, I went through all that, even replacing the burner components. It's got to be the propane regulator....
Thanks for the feedback!


Quick test:
If you light your stove , observe the flame as you turn on the water heater. If the stove’s flame diminishes as the WH fires up, i would suspect the LP regulator.

klutchdust

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Posted: 10/03/22 04:22pm Link  |  Quote  |  Print  |  Notify Moderator

After changing out the propane tank once I turned the valve on the tank quickly and It triggered a valve that was built into the fuel line and stopped the flow of the gas . What a time I had figuring that one out.
Also spider webs can interfere with fuel flow. I had that issue recently and my water heat was acting erratically, blowing black smoke. I just ran it on electric until I got home.
Normally before each trip I use compressed air to clean out the fridge chimney and fuel chamber and water and furnace tunnels.

Holiday27

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Posted: 05/20/23 08:57am Link  |  Quote  |  Print  |  Notify Moderator

I replaced the regulator and still have the same issue. So frustrated. Could low voltage cause this?

bobndot

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Posted: 05/20/23 02:10pm Link  |  Quote  |  Print  |  Notify Moderator

Holiday27 wrote:

I replaced the regulator and still have the same issue. So frustrated. Could low voltage cause this?


First thing to know.
When you pulled the furnace out to test it outside of the rv, did you use the same 12v power source or a different power source ?

There is a link that i saved that might be worth a read. It might cover something you missed.
It covers outside and inside furnace operation.

https://www.rvtravel.com/ask-dave-furnace-functions-irregularly-rvdt-1733/

Holiday27

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Posted: 05/20/23 06:16pm Link  |  Quote  |  Print  |  Notify Moderator

bobndot wrote:

Holiday27 wrote:

I replaced the regulator and still have the same issue. So frustrated. Could low voltage cause this?


First thing to know.
When you pulled the furnace out to test it outside of the rv, did you use the same 12v power source or a different power source ?

There is a link that i saved that might be worth a read. It might cover something you missed.
It covers outside and inside furnace operation.

https://www.rvtravel.com/ask-dave-furnace-functions-irregularly-rvdt-1733/


Thanks! I'll check it out.

I connected it to my car and a BBQ propane tank. It ran great. That's why I'm thinking possible voltage issue. Later tonight I'm going to try to run it with and external propane tank to eliminate that as an issue...

Holiday27

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Posted: 05/21/23 10:47pm Link  |  Quote  |  Print  |  Notify Moderator

Tried an external tank, no change. Checked voltage and getting 12 volts at on/off switch and 11.2 at the power junction. I'm going to pull the burner tomorrow. The flame sounds erratic.

bobndot

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Posted: 05/22/23 04:35am Link  |  Quote  |  Print  |  Notify Moderator

I’m thinking air mixture.

#8 on the link shows info with pics.

https://rventhusiast.com/rvexpert/furnace-follies/

Hope this helps.

Bob

BarabooBob

Baraboo, WI

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Posted: 05/22/23 02:32pm Link  |  Quote  |  Print  |  Notify Moderator

Do you happen to have a screen on the furnace intake/exhaust area? If it is too fine of a mess, it could restrict air intake.
I am sure that you have a restriction somewhere on your air intake. This would result in a rich mixture that causes smoke.


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