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Old 11-02-2016, 04:26 PM   #1
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Furnace access

Hello. We have a 2014 Sierra Fifth wheel with 5 slide outs. Our furnace is on the fritz. Does anyone know of EASY access to furnace?
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Old 11-02-2016, 06:48 PM   #2
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Might help more if you posted which model you have.
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Old 11-03-2016, 09:51 AM   #3
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I believe it is a 355 re
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Old 11-03-2016, 02:24 PM   #4
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DDugan, my conservative estimate is that 90% of "furnace on the fritz" issues are solved without ever having access to the physical furnace. Problems stem from electric source, propane source, thermostats, incorrect expectations, etc. In a very small percentage of cases, something like a sail switch will be the culprit.

Your thread has been viewed 89 times with no proposed answers (my furnace can be seen when I remove the furnace return air grill under the refrigerator but it is stretch to say it can be accessed). I strongly suggest you post the details of your "fritz" so that our experts can help you solve the issue.
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Old 11-03-2016, 06:56 PM   #5
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Furnace access.

Ok. Here's what happens. We turn the furnace on. It runs for approx 10 minutes blowing cool air then it shuts off. Propane tanks are full and operational. Thermostat is set at high 60s.
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Old 11-03-2016, 07:06 PM   #6
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Lots of questions.
Does the stove work ( propane flowing in lines)?
Did you recently remove and fill a tank?
Can you hear the furnace tying to light ( clicking sound heard outside)?
Did it fail to light more than three times on this or last try?

Try removing the fuse that controls the furnace. Leave it out for a minute or two. Reinstall fuse. Turn on stove and let it run a minute or two to purge lines. Turn thermostat up and try gain. Clicking?

The control board has a safety feature that after a few tries, it locks down the system and will not let propane flow as it believes there is a fault. Removing power allows it to reset.
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Old 11-04-2016, 01:27 PM   #7
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Thank you. We turned main switch off in trailer in hopes of resetting. When I turned furnace on it blew hot air but shut off again after minutes. Stove and hot water tank working. When I turned it on again it blew cool air for about 10 minutes and shut down.
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Old 11-04-2016, 01:53 PM   #8
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More questions for you DDugan...

Are you plugged in to shore power?
Do you know what your battery voltage is?
It is important to know what the battery voltage is whether you are plugged in or not.

The sail switch (inside the furnace) has to prove out that the furnace blower is running fast enough to allow the control module to open the gas valve. (furnace blower is a two part motor - one side blows the hot air in the camper - the other side provides combustion air in the burner)

If the 12v system does not provide enough voltage to run the blower fast enough (because you've run the battery low by not being hooked to shore power -or- the converter is not working correctly and not charging the battery when on shore power) then your furnace will act as you have described.
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