Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 05-19-2022, 08:40 PM   #1
Junior Member
 
Join Date: Nov 2021
Posts: 16
Fantastic fan blows fuse

2018 Winnie sunstar LX , bedroom Fantastic fan works fine on fan mode. when placed on exhaust mode it pops 20a fuse in distribution panel which also shuts down bathroom fan and thermostat display. thermostat with no display means no A/C. Replaced the fantastic exhaust/ fan directional rocker switch with a new one (Fantastic K9001-09 OEM Roof Vent Air Flow Reverse Switch) and it still pops breaker, (bath fan and A/C are off) so old switch was good. anyone have a similar issue?
does it sound like a short ? any troubleshooting tips to find why it trips and why it takes out bath fan and thermostat? I'm kind of anal and would like to get it working correctly. Any thoughts?
Thanks
jespo27 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 05-19-2022, 08:51 PM   #2
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 26,357
Yes it sounds like a short .
Most likely internal in the motor ; disconnect motor wiring , at the motor to be sure .Then flip the switch to see if the problem is between the switch and the motor .

Three loads; both fans and t'stat ; on a single 12 volt circuit ( fuse ) not unusual in RV wiring .
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 05-20-2022, 07:54 AM   #3
Junior Member
 
Join Date: Nov 2021
Posts: 16
Thanks Skip, I will disconnect motor leads and turn on power and try forward and reverse. If fuse doesn't blow, it will confirm short in fan motor. Great plan and I thank you for response. Replacing fan motor easier than tracing shorted wire to panel.
Will let you know what I find.
Love this forum.
jespo27 is offline   Reply With Quote
Old 05-20-2022, 09:41 AM   #4
Junior Member
 
Join Date: Nov 2021
Posts: 16
hi Skip, this is what i did. lowered fan, disconnected red wire only going to fan,
turned on fan switch to #1 position and moved reversing switch to in and out. heard pop and fuse blew at distribution panel and this time also blew glass fuse in fan .
did I do something wrong?
jespo27 is offline   Reply With Quote
Old 05-20-2022, 10:08 AM   #5
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 26,357
Kind of . you needed both wires off the motor .

With the red wire delivering power to the motor , the other wire is ground . NOW in that case it doesn't matter if the ground is through the wire ; or through the internal short in the motor .
But when power is fed to the second wire and can't go through the motor to the red wire , it goes straight to the short ( to ground ) and you blow the fuses .

After 12 volt power has passed through a load device , ( in your circuit the motor) it can be grounded anywhere to complete the circuit ; but when the power hasn't passed though a load device, and finds a path to ground that's a short and the fuses do there job of shutting off the power before the wiring burns up.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 05-20-2022, 11:47 AM   #6
Moderator Emeritus
 
Gary RVRoamer's Avatar


 
Join Date: Jan 2000
Location: Silver Springs, FL. USA
Posts: 25,024
Remember that this unit changes direction from fan-in to exhaust by reversing the polarity to the motor. The hot & ground wires change (reverse) when you change to exhaust mode.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
Gary RVRoamer is offline   Reply With Quote
Old 05-20-2022, 12:06 PM   #7
Senior Member
 
SteveJ.'s Avatar
 
Join Date: Dec 2019
Location: America's Seaplane City.
Posts: 736
I'd be double checking the wiring, both the workmanship and the routing, on or leading to/from the reversing switch.
__________________
1998 Safari Trek 2480, 7.4 Vortec
'15 Kawasaki Versys650LT, well farkled
Mid Flowriduh
SteveJ. is offline   Reply With Quote
Old 05-20-2022, 02:00 PM   #8
Junior Member
 
Join Date: Nov 2021
Posts: 16
Thanks all for the input and suggestions, I will put my repair hat on tomorrow and start checking again, after my new fuses arrive...

I will make sure no wires are going to motor and tape them off and then turn on coach power then fan switch to see if fuses dont blow when I then work reversing switch. if the fuses stay fine, then probably bad fan motor .
Fingers crossed !
jespo27 is offline   Reply With Quote
Old 05-20-2022, 02:24 PM   #9
Senior Member


 
Join Date: Nov 2015
Posts: 1,102
I think Gary hit the nail on the head, motor gets reverse polarity to change wind direction. Both wires to the motor should not have ground contunity after the control box.

CLIFFORD
clifford j is offline   Reply With Quote
Old 05-21-2022, 07:14 PM   #10
Junior Member
 
Join Date: Nov 2021
Posts: 16
Fixed, turns out the reversing switch was not wired correctly. After isolating the positive and ground supply wires and connecting to correct terminals on reversing switch, and then placing fan motor wires to remaining terminals, fan now blows in and out with no fuses being blown. I want to say thank you all so very much for the input I received, and for the great feeling of accomplishment that I have for making a successful repair. Thanks again to you all.
Joe
jespo27 is offline   Reply With Quote
Old 05-23-2022, 03:07 AM   #11
Senior Member
 
Ray,IN's Avatar
 
Join Date: Aug 2001
Location: North America somewhere
Posts: 25,519
FYI; this is general information about Fan-Tastic Fans. The lid has a lifetime warranty, other parts have a 2 yr warranty. If you need a new lid, jot down the model # and call Dometic customer service . Phone: 800-544-4881 E-Mail: customersupportcenter@dometic.com


I got 2 new lids from Dometic Customer service in Feb. Dometic even paid FedX shipping!
__________________
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
Ray,IN is offline   Reply With Quote
Old 05-24-2022, 05:03 PM   #12
Junior Member
 
Join Date: Nov 2021
Posts: 16
Great info, thank you so much
Joe
jespo27 is offline   Reply With Quote
Reply

Tags
fan, fuse



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuse for Center vanity Fantastic fan tednruthy Newmar Owner's Forum 3 08-11-2016 09:44 PM
Fuse Blows- "40A IGN A" fuse - HELP!! jntrox Workhorse and Chevrolet Chassis Motorhome Forum 7 08-05-2012 07:19 PM
Fantastic Vent = Fantastic Fan GoneFishin MH-General Discussions & Problems 3 04-26-2010 05:17 PM
Fantastic Fan Fuse on 1999 Brave 35C John Hilley Winnebago Industries Owner's Forum 4 03-13-2008 05:18 PM
Fantastic fan really is FANTASTIC stevelp Gear and Product Discussions 3 01-27-2008 12:09 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 05:48 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.