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tragusa3's avatar
tragusa3
Explorer
Apr 25, 2016

Troublesh5oot Converter Cooling Fan (on all the time)

Okay. I've read all I could on this forum and still don't know what's going on.

Here's what I know.

1. converter charges at 13.4v to battery.
2. battery is one month old and has full fluid in all cells.
3. battery was sitting with no load for a few weeks and holding 12.55v
4. converter cooling fan runs constantly when plugged into 120v
5. converter cooling fan does not run when running only 12v
6. I pulled off the cover and checked for dirt and dog hair making things run hot. It was spotless.

Any ideas? We leave in about 30 days for a 2 month trip. I hate to leave and have a problem. And, I hate to bring it in and loose it until the trip. Actually, based on their track record with me, 30 days isn't enough time for them to look at it anyway. :M

18 Replies

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  • tragusa3's avatar
    tragusa3
    Explorer
    May 10, 2016
    The cooling fan is still running all of the time, but the converter is otherwise doing its job.

    We leave in about 3 weeks for a 6-7 week trip. I don't have time to deal with bringing it to the dealer, and they probably wouldn't have time to fit me in at this point. I suppose we are going to take our chances on this trip and get it looked at afterwards. Hope we have no issues... always happens at the wrong time.
  • SoundGuy's avatar
    SoundGuy
    Explorer
    Apr 25, 2016
    tragusa3 wrote:
    WFCO 8955PEC is the model.


    Sounds to me as though your WFCO 8955 is operating just as they all do, including mine which I've never seen go beyond 13.6 volts. Of course the converter fan won't run when you're not plugged into shore power as the converter is electrically "dead" with no 120 vac shore power feeding it but when it is the fan is load / heat sensitive and should run intermittently, not constantly ... other than that I don't see any concern. However, if you intend to dry camp and rely on battery power to any great extent you're going to want a better means of recharging than what your WFCO is capable of. WFCO claims the 8900 series converter will bulk charge at 14.4 volts but I've never seen it with any 8900 series WFCO I've owned.
  • time2roll's avatar
    time2roll
    Nomad
    Apr 25, 2016
    This might be normal. 13.4 is a bit low. WFCO should hold 13.6 on the battery after 24 hours but it is a slow trickle charge so it may take some time.

    All loads must be off. A couple incandescent lights can kick the fan on. Any chance you have something else on?

    Plug it in 72 hours and see what happens. WFCO is somewhat known for acting a bit odd.
  • tragusa3's avatar
    tragusa3
    Explorer
    Apr 25, 2016
    WFCO 8955PEC is the model.

    Battery is fully charged. It's been at rest over 24 hours and just measured 12.6v. This is probably why I was measuring 13.4v at the battery yesterday, as the converter wouldn't have been running that high?

    No dirt causing heat.

    I have a multi-meter (no clamp on). Don't know how to use it other than checking voltage.
  • time2roll's avatar
    time2roll
    Nomad
    Apr 25, 2016
    May as well post the model number.
    Best to check the current output in amps with a clamp-on meter.
    How long has it been plugged in with fan running?
  • MrWizard's avatar
    MrWizard
    Moderator
    Apr 25, 2016
    and what is the problem
    battery not charged ?
    replace converter 13.4 at the batteries is barely above float voltage, battery will not get fully charged
    you 14.2-14.4 at the battery to achieve full charge

    13.4v is find on shore power to 'Maintain a charged battery'
  • beemerphile1's avatar
    beemerphile1
    Explorer
    Apr 25, 2016
    The fan will never run when unplugged from power source.

    Do you have an ammeter and can check for a load?

    What converter do you have? Brand and model number.

    Some fans are triggered by load, some from heat.

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