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Old 07-01-2013, 07:48 PM   #1
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WFCO Fan runs continually

My last trip out I accidentally ran my 2x 6 v batteries right down dead ,They are only 1 year old.When I got home I charged them up on my deep cycle battery charger.I don't have meter but they are showing top level as charged on my hydrometer.I then plugged the trailer into shore power for 2 weeks now.I am getting ready to head out in the morning so went out and put the fridge on in DC and it is still plugged into shore power.Right away when starting the fridge the fan on the WFCO unit came on and has been running for 2 hours now.Any ideas as to why or Is that normal for it to run until the fridge cools right down ,and then will it stop running?
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Old 07-01-2013, 07:52 PM   #2
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Welcome to the forum.

Is it the fan on the Wfco or for the fridge? My converter is under my fridge so it is a little harder to distinguish one from the other.
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Old 07-01-2013, 07:58 PM   #3
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Welcome to the forum.

Is it the fan on the Wfco or for the fridge?
I concur is it defiantly the converter fan?
Fridge shouldn't draw enough amps on its own to start converter fan.
Now if there's an issue with your batteries plus your fridge then it may.

Also if converter is stuck in bulk mode the fan may run continuously.

You need to get your meter out and start checking converter output as well as have the batteries load tested.

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Old 07-01-2013, 08:12 PM   #4
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You need a meter. Hydrometer only tells you information on your electrolyte. Doesn't tell you about the charge. If you ran them down dead, they may be gone.
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Old 07-01-2013, 08:15 PM   #5
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Definitely the convertor.The fridge and convertor are separated enough to tell.I just turned the fridge off and put it onto propane and the fan stopped .Guess I'll have to go buy a meter and then what do I check.And what kind of meter.
Is there a reset button on the convertor if it is stuck in bulk mode? ,I flipped the breakers off and on but still runs.
Thanks for the quick replies too.
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Old 07-01-2013, 08:24 PM   #6
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Are lights on? Mine turns on with 3 or so fixtures on.
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Old 07-01-2013, 08:25 PM   #7
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Definitely the convertor.The fridge and convertor are separated enough to tell.I just turned the fridge off and put it onto propane and the fan stopped .Guess I'll have to go buy a meter and then what do I check.And what kind of meter.
Is there a reset button on the convertor if it is stuck in bulk mode? ,I flipped the breakers off and on but still runs.
Thanks for the quick replies too.
Get a cheap digital volt ohm meter.
There's a troubleshooting guide for your wfco 8900 series converter in the "library" section in the green banner towards the top of browser.

Your batteries will have to be load tested at an auto parts store. "Normally free"

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Old 07-01-2013, 08:29 PM   #8
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Are lights on? Mine turns on with 3 or so fixtures on.
No, nothing else is on except the lights on the smoke detector and stereo screen light, so those should't take very much power.
When I unplug from shore power the fridge runs on battery and there is battery power.And no fan,only when it is plugged into shore power and the fridge is on dc that the fan runs continuously.
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Old 07-09-2013, 06:36 PM   #9
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.I just bought a multimeter and tested my batteries and they are fully charged and have been getting charged from being plugged into 110 as I have used the trailer for a 5 day camping trip.lots of power on AC and everything runs perfectly on AC.As soon as I am home again and plugged into 110 again the fridge makes the fan run continually.I was just in the trailer and it being a hot summer 32C day it is quite warm in there and that probably keeps the fan going continually in it's self.
The question I have never been able to get a final answer on is ,is it normal for that fan to run continually under some normal conditions ,such as outside temperature and appliances like a fridge running on DC power?Will the fan not burn out after extended running time?
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Old 07-09-2013, 06:48 PM   #10
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Fan should only run with lots of 12v load.
Lights
Ceiling fan
bathroom fan
Fridge alone will not make converter fan run continuous.

You voltage checked battery but it really needs to be load tested.
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