Good Sam Club Open Roads Forum: Tech Issues: Dometic Mother Board
Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Tech Issues

Open Roads Forum  >  Tech Issues

 > Dometic Mother Board

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 4  
Prev  |  Next
dougrainer

Carrolton, Texas

Senior Member

Joined: 06/11/2007

View Profile


Offline
Posted: 05/03/22 07:33pm Link  |  Quote  |  Print  |  Notify Moderator

PastorCharlie wrote:

dougrainer wrote:

What does the display state on the wall tstat? Doug


FAN: Auto
SET POINT: 72* F
MODE: Cool or Heat Pump if set to heat pump. Depends upon what mode is set.


OK If both Zone 1 and Zone 2 will show same thing AND you can go from Auto(fan) to the 2 fan speeds. Then the board is OK. Odds are you have NO 120 power to the roof AC unit. This can be a fault at the AC Breaker or also at the upper board 120 connections have had a loose connection and the wire nuts melted and came apart. BTW, you should have a FURNACE option on Zone 1. What Year/Brand/Model RV? IF you have a EMS system, that could also stop 120 power to the roof AC. Which AC is faulted? Zone 2? Doug

PastorCharlie

NC

Senior Member

Joined: 03/28/2004

View Profile





Offline
Posted: 05/04/22 06:42pm Link  |  Quote  |  Print  |  Notify Moderator

dougrainer wrote:

PastorCharlie wrote:

dougrainer wrote:

What does the display state on the wall tstat? Doug


FAN: Auto
SET POINT: 72* F
MODE: Cool or Heat Pump if set to heat pump. Depends upon what mode is set.


OK If both Zone 1 and Zone 2 will show same thing AND you can go from Auto(fan) to the 2 fan speeds. Then the board is OK. Odds are you have NO 120 power to the roof AC unit. This can be a fault at the AC Breaker or also at the upper board 120 connections have had a loose connection and the wire nuts melted and came apart. BTW, you should have a FURNACE option on Zone 1. What Year/Brand/Model RV? IF you have a EMS system, that could also stop 120 power to the roof AC. Which AC is faulted? Zone 2? Doug


2008 Model Year

Zone 1:
FAN: Low, High. Auto
MODE: Off, Fan, Cool, Heat Pump, Furnace, Heat Strip

Zone 2:
FAN: Low, High, Auto
MODE: Off, Fan, Cool, Heat Pump

Has EMS that controls Front Heat Pump, Rear Heat Pumps, Hot Water, and Washer Dryer. Rear Heat Pump is affected, Zone 2.

I suspected the EMS. I asked RV dealer to check EMS and he said it was ok. I went through process of resetting it before having dealer look at it.

dougrainer

Carrolton, Texas

Senior Member

Joined: 06/11/2007

View Profile


Offline
Posted: 05/04/22 08:11pm Link  |  Quote  |  Print  |  Notify Moderator

I also requested Brand. THAT tells me which EMS system you have. If the EMS does not send the 120 to the rear AC, then nothing on it will run. The tstat controls are 12 volt. Doug

PastorCharlie

NC

Senior Member

Joined: 03/28/2004

View Profile





Offline
Posted: 05/05/22 06:31pm Link  |  Quote  |  Print  |  Notify Moderator

dougrainer wrote:

I also requested Brand. THAT tells me which EMS system you have. If the EMS does not send the 120 to the rear AC, then nothing on it will run. The tstat controls are 12 volt. Doug


EMS by Intellitec

dougrainer

Carrolton, Texas

Senior Member

Joined: 06/11/2007

View Profile


Offline
Posted: 05/05/22 06:45pm Link  |  Quote  |  Print  |  Notify Moderator

Have you finally figured out, you have been scammed? You do NOT need the Dometic board, you need the 120 checked at your Main 120 Breaker box. ALL 120 connections for both the Intellitec and the Coach 120 system breakers are in that box. IF the Rear AC output relay has power going out of the Intellitec board, then the odds are the wire nut connections at the rear AC have burned apart, and you have no 120 power to the AC unit. After 43 years as an RV Tech, I have to admit that the current crop of so called RV techs are nothing but part changers. They have no diagnostics skills and just want to replace "Motherboards" as they think all problems are caused by faulty boards. Fur future reference, When I state Year/Brand /Model of RV, please post what I ask for
2008 - Monaco - Diplomat would be what I need. I thank you for knowing that it was the Intellitec system, but there are only 2 REAL systems used Intellitec and PCS. Doug

dougrainer

Carrolton, Texas

Senior Member

Joined: 06/11/2007

View Profile


Offline
Posted: 05/05/22 06:47pm Link  |  Quote  |  Print  |  Notify Moderator

This will give you help. Doug

https://intellitec.com/wp-content/uploads/2019/08/53-00894-000.pdf

dougrainer

Carrolton, Texas

Senior Member

Joined: 06/11/2007

View Profile


Offline
Posted: 05/06/22 09:53am Link  |  Quote  |  Print  |  Notify Moderator

Do you know if you have the 500 or 600 series Dometic? The 600 is the Penguin models low profile. Doug

PastorCharlie

NC

Senior Member

Joined: 03/28/2004

View Profile





Offline
Posted: 05/06/22 06:13pm Link  |  Quote  |  Print  |  Notify Moderator

2008 Newmar Grand Star 3752
Intellitec model 900
AC/HP Model 630515. Front and Rear are same. Do not know Series if low or high profile...appears to be low compared to most I see.

This information I gather from inside literature. I am too old, and the weather is too stormy to venture onto the roof.

dougrainer

Carrolton, Texas

Senior Member

Joined: 06/11/2007

View Profile


Offline
Posted: 05/07/22 10:03am Link  |  Quote  |  Print  |  Notify Moderator

6300 is the Low Profile Penguin model. THAT model will have the Board ON the AC unit. You have to remove the upper cover of the unit and then remove the Evaporator cover either Styrofoam or plastic, depending on the year of the Penguin. Once the evap cover is removed you will see a 2 by 4 inch metal electrical box in front of the evaporator. THAT houses the 120 from the inside breaker and connects to the 120 going to the Board on the AC unit. This is where you may have a burnt 120 connectiOn IF THE 120 AT THE MAIN BREAKER PANEL SHOWS 120 OUTPUT FROM THE INTELLITEC EMS MODULE. Since you have to go on top and your age, you may have to get either a professional or somebody that is very handy to do the roof top checks. Regardless, you NEED someone that can operate a multitester to check various 120 volt circuits if you are not handy to use one. Doug

PastorCharlie

NC

Senior Member

Joined: 03/28/2004

View Profile





Offline
Posted: 05/07/22 05:59pm Link  |  Quote  |  Print  |  Notify Moderator

It is still raining here. I will check following your instructions when I am more comfortable in doing so. I depended on my RV dealer to save me from climbing on top. They did check on top by removing the cover and testing.

Thanks for your help. I do appreciate it.

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 4  
Prev  |  Next

Open Roads Forum  >  Tech Issues

 > Dometic Mother Board
Search:   Advanced Search

Search only in Tech Issues


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:




© 2022 CWI, Inc. © 2022 Good Sam Enterprises, LLC. All Rights Reserved.