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Old 06-19-2018, 08:20 PM   #1
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Fan running at fuse box

I have a 2017 Thor class c four winds motor home. We are plugged into campground electric. I never heard it run before. Is this normal ? How do I get it to stop? Any help is appreciated! Thank you!
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Old 06-19-2018, 10:40 PM   #2
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Sound like converter fan.


When on shore power converter takes AC In and puts DC out......to supply all the 12V DC components (fuses) and to maintain/charge battery


Fan runs based on 'thermal' switch to keep converter cool


High amp load causes HEAT
Check battery cables....clean/tight
Check if battery is HOT...over charging/bad cell
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Old 06-20-2018, 03:12 AM   #3
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drdeacon-

As "Old-Biscuit" says, sometimes there are malfunctions that cause the converter fan to run when it shouldn't. Diagnose and fix those first.

If you find no malfunctions, then call the converter manufacturer to discuss it with them. Ask if there are ways to adjust the fan controls. If he says "No," then you may be able to replace the converter with one that does not run as often. I know of folks who have done this.
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Old 06-24-2018, 05:55 PM   #4
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Thanks for the help!
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Old 06-30-2018, 03:31 PM   #5
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On mine, just one old Incandescent fixture will cause the fan to come on within a matter of minutes; several LED lights do NOT ... It generally indicates a high current draw, but that load can be the battery charger; if load drops, it cools and turns itself off.
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Old 07-11-2018, 09:15 AM   #6
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Fan

My fan ran a lot when house battery was bad, replaced battery and it went away!
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Old 07-16-2018, 04:47 PM   #7
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The fan will operate to keep the electronics cool anytime any electrical components in your motorhome are in use.
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Old 07-22-2018, 04:41 PM   #8
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Had the same issue

Had the same problem with my MH after I bought it this spring. Took it out for the weekend, and noticed that the fan seemed to be running too often. The next day the propane alarm started randomly going off. I wasnt smart enough to put two and two together until I walked past my battery box and heard a hissing sound. Turns out the batteries were bad and were causing the converter to get hot. The batteries were also off gassing, and setting off the propane sensor. Replaced batteries and all the problems went away.
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