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 C 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 06-26-2022, 12:04 AM   #15
Senior Member
 
Gulf Streamers Club
Ford Super Duty Owner
Join Date: Aug 2015
Location: Memphis, TN
Posts: 3,684
The AC controls are 12vdc, POWER TO THERMOSTAT FROM CIRCUIT BOARD located in RETURN AIR DUCT
__________________
(TerryH.) 2000-GS Conquest Limited 6266 Class-C 99-E450SD V10
THenne1713 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 06-26-2022, 04:36 AM   #16
Senior Member
 
f14av8r's Avatar
 
Winnebago Owners Club
Freightliner Owners Club
Join Date: Jul 2010
Location: Tampa Area (sometimes!)
Posts: 620
While you are in there, replace that thermostat with the bluetooth version. Then you can manage your AC from your easy chair on your smart phone!
__________________
Randy and Tina & fur baby - Cinnamon
2020 Tiffin Wayfarer RW
Mercedes Benz 2019 Sprinter Chassis
f14av8r is offline   Reply With Quote
Old 06-26-2022, 04:05 PM   #17
Member
 
Join Date: Mar 2022
Posts: 42
Ok, dumb question: where is the return air duct? That's not the vent where the cold air comes out, is it? I pulled off one side, but need more time / more tools to open up the other side... or is it something else?
papademuchos is offline   Reply With Quote
Old 06-26-2022, 08:10 PM   #18
Senior Member
 
youracman's Avatar
 
Winnebago Owners Club
Join Date: Sep 2011
Location: Denver, CO
Posts: 575
Blog Entries: 1
1. Remove the fasteners as if you were going to change/clean the air filter. (You should do this often in an RV......they get dirty pretty quickly.) 2. Remove the filter and you will be looking at the return air duct.

My rig is enroute home from a trip to Canada (daughter and grandkidz have it) or I would take a pic or two for you ...... hopefully of the ckt bd/wiring THenne refers to. I'll do that this coming week and if it works out OK I will post (just for the archives) ...... and maybe it will help someone else one day.

Best........... Ed S
__________________
Ed Sievers, Denver, CO
07 WBGO Outlook 31C (SOLD) Toad: '16 Soul Manual Shift
"Be the person you needed when you were younger"
youracman is offline   Reply With Quote
Old 06-27-2022, 12:31 AM   #19
Member
 
Join Date: Mar 2022
Posts: 42
Smile

Thanks again for the ideas and suggestions on where to look. I believe my problem is here in the wiring connections to the thermostat. I opened this up before, but never pulled the wires out this far from the wall:

Click image for larger version

Name:	Wiring.jpg
Views:	19
Size:	312.2 KB
ID:	369433

Before looking at the wiring, I opened up the air duct (thanks youracman) and looked inside. I'm assuming that's the circuit board up inside there:

Click image for larger version

Name:	Air_Duct.jpg
Views:	16
Size:	208.8 KB
ID:	369431

I also pulled out the white plug in the lower part of this picture, thinking that's the source of power to the circuit board:

Click image for larger version

Name:	Control_Board.jpg
Views:	22
Size:	162.4 KB
ID:	369432

After doing that, I pulled the wires out of the wall that connect to the thermostat. I tested some things - didn't really find anything. Then as soon as I plugged the white cord back in, the fan came on! (The thermostat had been left in the Cool / On (Low air) position). When I pulled the wires out I must've reconnected some of them that were loose.

I started to push the wires back into the wall and then it turned off. At first I thought it was the red wire connection, but now I'm thinking it's the yellow or the white. I'm away from home this week, but as soon as I get back on Sunday I plan to re-wire all of these... just to make sure all connection are tight and secure.

I'm super happy it's just a loose wire issue! Dollar signs were popping up in my head... or the hassle of trying to order an 18 year old circuit board replacement. I'll try to follow up with another post on Sunday just to close this out, but I'm pretty sure this is my issue.

Thanks again to everyone for your suggestions! Little by little I'm learning more about this rig.
papademuchos is offline   Reply With Quote
Old 06-27-2022, 10:49 PM   #20
Junior Member
 
Join Date: Jun 2022
Posts: 21
I’ve had my troubles with the Coleman mach 15k. On the third thermostat and second control board. It’s under warranty but good luck getting a dealer to fix your a/c when you need it. And if you want to pay extra buy your parts at Camping World, they charged me $257 for a thermostat Coleman lists retail around $160 (still an abomination).

First step to diagnose is pull your thermostat, it lifts up and out, then check your leads with a meter as you walk through each,setting, fan lo fan high cool low cool high cool low auto coll high auto and heat. Each time you should see 12v on the corresponding wire. Their web site has all the lead definitions, just Google to find it.

If that checks out then the problem is in the unit. The issue can be the control board, a capacitor or a motor (or a wire of course.). Start by repeating the thermostat test but at the control board end of the wiring. It’s harder or at least more dangerous to check the control board outputs because they are 120v and are enclosed in a wiring harness plug. One issue with the control boards is a relay being stuck either open or closed. My control board failure (straight from the factory) was a compressor that never shut off - relay stuck closed.

The control boards are easy to replace, remove the inside cover and faceplate, 2 spring nuts and out it drops.

That worked great for a week and then the thermostat went. CW replaced that in a mere 3+ months wait. It lasted 3 days. Failed in Texas in 102 degree heat. DW said if I could fix it ok but if not we were getting a hotel room and abandoning the POS in the campground. The math here was 10 days times $150 night versus ….

In the end yes it was easy to fix as long as you can do the diagnostics. If it’s on the roof my preference is a professional but anything other than the capacitors is above my pay grade,

At some point just junking the rooftop unit and dropping in a new one is easier. I spent $400 on parts, a new unit would have been $850 (or $1700 at CW).

One thing to remember is these units are sealed so if it is in the compressor, or Freon system it’s toast.
SantaFeSky is offline   Reply With Quote
Old 06-28-2022, 12:09 AM   #21
Senior Member
 
Gulf Streamers Club
Ford Super Duty Owner
Join Date: Aug 2015
Location: Memphis, TN
Posts: 3,684
So what is room temp and thermostat setting?
__________________
(TerryH.) 2000-GS Conquest Limited 6266 Class-C 99-E450SD V10
THenne1713 is offline   Reply With Quote
Old 06-29-2022, 01:02 AM   #22
Senior Member
 
Gulf Streamers Club
Ford Super Duty Owner
Join Date: Aug 2015
Location: Memphis, TN
Posts: 3,684
The thermostat and control circuit board/ RELAYS for air conditioner use 12vdc/ battery power to turn the 120vac to the air conditioner ON/OFF. No 12vdc= No air on most w/ remote thermostat.
__________________
(TerryH.) 2000-GS Conquest Limited 6266 Class-C 99-E450SD V10
THenne1713 is offline   Reply With Quote
Old 07-03-2022, 10:17 PM   #23
Member
 
Join Date: Mar 2022
Posts: 42
I finally found the culprit to my problem! At first I thought it was the wires connected directly to the thermostat - some of them seemed loose. However, after replacing the butt connectors on all them, I was still experiencing a problem with a "loose wire". When I would start to push the wires back up into the wall, it would cut out and turn off. When I would pull them back a little, then it would turn on.

In my unit, the thermostat is just under a cabinet in kitchen. On the left side of the cabinet are the meters and the generator switch. I pulled that cover off and discovered a whole "mess" of wires behind it. All of the wires going to the thermostat were in this area as well. After a bit of pulling and pushing I discovered the problem was with the red wire coming out on the right side of this blue splice connector:


Name:   RV_AC_Wire_Problem.jpg
Views: 16
Size:  10.9 KB

The two wires coming in and out of this connection are different sizes and perhaps that was contributing to the problem. After replacing the connector with something different my A/C works every time now.

Thanks again to everyone for your suggestions and ideas! I appreciate all the help and ultimately they led me down the right trail.
papademuchos is offline   Reply With Quote
Old 07-03-2022, 10:31 PM   #24
Senior Member
 
Join Date: Jul 2018
Posts: 4,249
Quote:
Originally Posted by papademuchos View Post
I finally found the culprit to my problem! At first I thought it was the wires connected directly to the thermostat - some of them seemed loose. However, after replacing the butt connectors on all them, I was still experiencing a problem with a "loose wire". When I would start to push the wires back up into the wall, it would cut out and turn off. When I would pull them back a little, then it would turn on.

In my unit, the thermostat is just under a cabinet in kitchen. On the left side of the cabinet are the meters and the generator switch. I pulled that cover off and discovered a whole "mess" of wires behind it. All of the wires going to the thermostat were in this area as well. After a bit of pulling and pushing I discovered the problem was with the red wire coming out on the right side of this blue splice connector:

Attachment 370054

The two wires coming in and out of this connection are different sizes and perhaps that was contributing to the problem. After replacing the connector with something different my A/C works every time now.

Thanks again to everyone for your suggestions and ideas! I appreciate all the help and ultimately they led me down the right trail.
Thanks for the update! This is useful info and will help others with yet another place to look for failure points.
__________________
2005 Four Winds Majestic 23A
ďTo the world you may be one person; but to one person you may be the world.Ē - Dr Suess
Solo_RV_Guy is offline   Reply With Quote
Old 07-03-2022, 10:43 PM   #25
Senior Member
 
youracman's Avatar
 
Winnebago Owners Club
Join Date: Sep 2011
Location: Denver, CO
Posts: 575
Blog Entries: 1
Quote:
Originally Posted by Solo_RV_Guy View Post
Thanks for the update! This is useful info and will help others with yet another place to look for failure points.
X2

We all like a "DIYer happy ending" story.....and pictures to boot! Good work. No service call, no parts, no waiting on people for days or weeks. Keep reading this forum ............. you will learn a lot; at least I do.

Good times and safe travels to ya.
__________________
Ed Sievers, Denver, CO
07 WBGO Outlook 31C (SOLD) Toad: '16 Soul Manual Shift
"Be the person you needed when you were younger"
youracman is offline   Reply With Quote
Old 07-04-2022, 12:54 AM   #26
Senior Member
 
Gulf Streamers Club
Ford Super Duty Owner
Join Date: Aug 2015
Location: Memphis, TN
Posts: 3,684
FYI, it was a similar "scotchlock-style" connector that I finally found after 3-years was the culprit in my REAR CAMERA VIDEO STATIC (including 3-differnt camera systems) ONLY WHEN ENGINE RUNNING; a #22 wire to a power plug to the AV wireless receiver was the CULPRIT that (made me thinK) that the issue was IGN generated, as the static only evident when engine running. Replacing with a larger wire power plug and a DOLPHON crimp connector w/ Sealant cured MY issue. Great Job, Good Luck.
__________________
(TerryH.) 2000-GS Conquest Limited 6266 Class-C 99-E450SD V10
THenne1713 is offline   Reply With Quote
Old 07-05-2022, 09:06 AM   #27
Senior Member
 
Diesel-Lover's Avatar
 
Join Date: Nov 2002
Location: OH
Posts: 816
[QUOTE=papademuchos;6234617]I finally found the culprit to my problem!




Hey way to Gunshoe it to the fruitful end. You are a regular Paul Drake and Perry Mason rolled up in one! Hopefully Della pitched in too!


Good dig and find. BTW if your Rheem stat (honeywell programmable thermostat) starts to act wonky the control board on the air handler has a 3 amp auto blade fuse on it, its light pink and probably busted. Just happened to me over the loooooong hot weekend! Looked high and low there was no voltage on a line checked all the breakers and such thought it was the outside unit etc, ends up the air handler.... and then to reset the outside compressor as well. All is well and crisp and cool. Now if there was a magical cure to keep the electric meter from going bonkers!
__________________
RUSTIC is good.
Kudos to those who make Local, State & Federal Parks & Campgrounds possible and to those picking up the slack by Providing Private Campgrounds.
Diesel-Lover is offline   Reply With Quote
Old 07-05-2022, 03:58 PM   #28
Senior Member
 
Gulf Streamers Club
Ford Super Duty Owner
Join Date: Aug 2015
Location: Memphis, TN
Posts: 3,684
(FOR INFO/ DISCUSSION) The CIRCUIT BOARD (bit higher priced than I wudda guessed :-( ) = RELAYS to control the 120vac COMPRESSOR HIGH/ FAN HIGH/ FAN LOW (note the three relays on the board?) using 12vdc thermostat, but also INPUT for FREEZE-STAT to shut down compressor when coil icing reaches a certain point.


https://www.rvupgradestore.com/Colem...xoCDgMQAvD_BwE
__________________
(TerryH.) 2000-GS Conquest Limited 6266 Class-C 99-E450SD V10
THenne1713 is offline   Reply With Quote
Reply



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
Trouble shooting converter 1999 Sea View baustin National RV Owner's Forum 4 12-15-2010 12:01 PM
A Trouble Shooting Dilemma Hammerdown Workhorse and Chevrolet Chassis Motorhome Forum 4 06-17-2010 07:24 AM
Magnadyne radio trouble shooting hint Paul T Winnebago Industries Owner's Forum 2 01-10-2010 04:08 PM
trouble shooting hydraulic fan capt Frank Freightliner Motorhome Chassis Forum 3 11-18-2009 09:05 PM
Need help trouble shooting bedroom slide out problem? rrob48 Winnebago Industries Owner's Forum 5 03-25-2008 01:18 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 09:45 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.