Furnace fan running unexpectedly - Dutchmen Owners

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Old 03-08-2016, 05:19 AM   #1
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Furnace fan running unexpectedly

We have a 2016 Dutchman Aerolite 282DBHS and love it so far. We have had it out almost a half dozen times since we purchased it in August. Yesterday I picked it up from the storage facility to get it ready for our next trip and the batteries were absolutely dead. In my infinite wisdom I forgot to open the battery disconnect the last time I dropped it off. Any way, when I got it home and plugged it in the furnace fan started running. The thermostat is off and the fan should not be running. Is this a result of the batteries being low so the whole system is out of whack? Today I took the trailer out to our spot and as I was setting up I noticed the furnace fan was running again. I double checked the thermostat and again, everything was off. I cycled the t-stat through to get to the off position and the fan finally stopped running. This is a new occurrence for us. I ask again, is this a result of the batteries being dead and working to come back up? I had charged them over night so I assumed they would be good when leaving today but the fan still ran so now I am at a loss. Any commentary would be greatly appreciated.

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Old 03-08-2016, 05:33 AM   #2
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You are referring to a "thermostat" Does it also turn the unit "off". For long term storage you definitely want to disconnect the batteries but while in use, if there is not propane available and the "thermostat" is set to the lowest possible position, i.e. 60ish....It will try and heat up to 60 degrees until it drains the batteries. Find the "OFF" switch!
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Old 03-08-2016, 05:37 AM   #3
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Thanks Rob C.
The thermostat was off. It's an electronic t-stat that has controls for fan (on/off/auto), AC, and heat. After that it simply goes to on/off. I was off when all of this occurred. The t-stat can turn everything off when in the off setting.
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Old 03-08-2016, 01:23 PM   #4
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I would carefully read the manual as ours has a minimum set point that can be programed, I set ours to 35 degrees. So when the thermostat is on, it will run whatever temp you have set. However when the thermostat is set to off, it wont do anything until it gets down to 35 degrees then it will active to keep the trailer from freezing. Not saying this is what you have going on, just throwing it out there.
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Old 03-09-2016, 12:55 AM   #5
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With power on the unit. Cycle you T-stat fan setting from ON, Auto. Just make sure its in the auto position. I bet this fixes you problem
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Old 03-09-2016, 01:31 AM   #6
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I was just thinking about this. Furnaces usually have an overheat sensor inside that will run the fan until the furnace cools down enough for the sensor to shut off. Maybe you have a bad overtemp sensor in the furnace.
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Old 03-09-2016, 05:18 AM   #7
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Occupant 5143 has an interesting hypothesis! To take this one step further and this kind of thing is so common on these units depending on if they were assembled during the week or on a Monday (hangover) morning! Make sure all of the wires are connected to the HVAC unit! The switch he is talking about is likely triggered by an "open" circuit. If the wires are disconnected, the circuit can never close!!!
FYI, the central vacuum unit in my rig never had the hose connected to the floor sweep panel! **** happens on Monday morning and Friday afternoon!!
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Old 03-09-2016, 06:03 AM   #8
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Oops, I have to rethink the overtemp switch theory. I was thinking about the time delay relay which is what keeps the fan running for a couple of minutes after the thermostat has switched off the signal to the furnace. Could be stuck in the on position.
Here's a document that describes exactly how the furnace responds to the thermostat. Makes for interesting reading.
http://www.rvforum.net/miscfiles/Furnace_Trouble-2.pdf
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Old 03-09-2016, 02:53 PM   #9
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Thanks all. I will dig into it deeper today and will let you know if anything works. I cycled the t-stat like EricNSTL recommended when I dropped it off on Monday. I'll see if it's still operating correctly when I get back to it this afternoon.
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Old 03-09-2016, 04:45 PM   #10
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Double check that you have the fan switch set to Off or Auto? If the T-stat fan switch is set to the On position, the fan will run continuously even if the stat is not calling for heat.

Committ the Lock-out reset proceedure to memory, you will need, your furnace will go into Lock-out at the most inopportune times.
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