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Old 05-25-2013, 08:43 AM   #1
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Inverter Fan runs when not plugged in

I have a 2004 American Tradition and just replaced the house batteries. When I hooked them up I noticed the fan started running on the inverter/charger and the coach is not plugged into AC nor is the generator running. I had all power shut off inside and out of the rv. It is a Xantrex and don't ever remember it running before with all the power turned off. I let it run for a while thinking it might kick off, but it never did. I know that it will obviously run down my batteries if the fan is running and it's not plugged in.

Any ideas of why this would happen?


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Old 05-25-2013, 10:02 AM   #2
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It sounds like the Inverter is on producing 120v power. Try turning it off.

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Old 05-25-2013, 12:18 PM   #3
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I have manually turned it off and it is not producing 120v, but the fan still runs.
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Old 05-25-2013, 12:20 PM   #4
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It's inverting and the fan is running to keep things cool. Just like is does when it is heavily charging. Have you never run the inverter side of things before?

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Old 05-25-2013, 12:27 PM   #5
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I've got a Xantrex inverter also. I've never had your problem but one thing that has helped some problems in the past is to unplug the RJ11 cord (phone cord) from the inverter that goes to the control panel. Give it 10 seconds and plug it back in. Another thought would be to either pull a battery cable so you know it's getting no power (or maybe you could just turn off the House Master Switch) for a minute, then back on again.

Finally, you could call Xantrex or one of their authorized Service Centers and explain the problem and ask if they know of a solution.

Good Luck!
Mike and Mike (Michele)

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Old 05-25-2013, 12:27 PM   #6
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I have used the inverting side before, but this is happening when I have the inverter off. I would expect it to run when in use or plugged in to shore power. It is happening when I have everything turned off and not inverting or charging.

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Old 05-25-2013, 12:46 PM   #7
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I did not try unplugging the cable last night, but I will give that a try. I did disconnect the batteries last night after I finished messing with it.

The thing that is odd I do have the house master switch off and this is happening.

I will give Xantrex a call on Tuesday if I can't resolve it over the weekend.

Thanks for you help!
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Old 05-25-2013, 12:49 PM   #8
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I've had the same problem for two years and never did find out what causes it. I've disconnected from the batteries and it would shut off. When the inverter mode is turned on, the trace inverter/charger will get louder. When off it seems there is only a slight humming/fan noise. I'm curious what the outcome of your thread will do.
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Old 05-25-2013, 01:07 PM   #9
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Maybe you can find your answers here.

Maybe the compartment needs better venting.
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Old 05-25-2013, 07:50 PM   #10
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I wish it was the ventilation thing, but it was like 60 degrees outside and cool in the compartment when this happened.

Thanks for the info!
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Old 05-26-2013, 07:19 AM   #11
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To the OP,

I have an older American Coach with the Heart(Xantrex) Source Manager which has recently failed.

I discovered when trying to re-set the unit that even with all disconnects turned off the inverter/charger still has power available to it as the fan continued to run after disconnecting all of the momentary switches and the main disconnect in the engine compartment. This was confirmed with Kevin Mallory (electrical engineer formerly with American Coach) as that is how these coaches were designed.

Disconnecting the house battery bank is the only method I found to stop the fan from running.

Hope this helps!

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fan, inverter

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