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Topic: Thermostat Replacement (Read 777 times) previous topic - next topic

Thermostat Replacement

I have a Duo Therm 4 button thermostat that controls the 3 AC units, Heat Pumps and Furnace Zones (Aqua Hot).  Does anyone know of a direct replacement?  Have not found the one I have online that is in our 2000 U320 so may be obsolete. 
I'm looking for a direct replacement or if anyone knows where a new original could be located.  Many Thanks!
Bill and Joyce, The House2 and Dashboard Pig III
2000 U320 4210 CAI (The House2)
Build # 5733
2019 F150 King Ranch FX4

Re: Thermostat Replacement

Reply #1 –
Dometic 4 button thermostat repair
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Thermostat Replacement

Reply #2 –
The commercial link to eBay on the forum is an early posting from 8 years ago. For a current listing do a Google search or a new eBay search for: "shop duo-therm comfort control 4 button thermostat"

Or as preferred, use the website:

Frerichs Electronics

Jim

2002 U320 42'
Jim Frerichs
2002 U320 42'

Re: Thermostat Replacement

Reply #3 –
Thanks guys for the reply's.  Jim, I sent you a pm. 
Bill and Joyce, The House2 and Dashboard Pig III
2000 U320 4210 CAI (The House2)
Build # 5733
2019 F150 King Ranch FX4

Re: Thermostat Replacement

Reply #4 –
Go to  microair.net  They have one for just about everything. The advantage with this type is you can also use your phone to set and adjust temps.  If you have it hooked up to wifi you can keep up with coach temps when you are not around.

I installed one in our coach and it was plug and play. I did screw up by putting the app on my phone first and then forgot what my password was.  I had to delete everything and start over.  Only other problem was if hooked up to wifi the name has to be longer then 3 letters or numbers.
2014 ih45  (4th Foretravel owned)
 1997 36' U295 Sold in 2020, owned for 19 years
  U240 36' Sold to insurance company after melting in garage fire
    33' Foretravel on Dodge Chassis  Sold very long time ago

Re: Thermostat Replacement

Reply #5 –
Quote from: turbojack –
Go to  microair.net  They have one for just about everything. The advantage with this type is you can also use your phone to set and adjust temps.  If you have it hooked up to wifi you can keep up with coach temps when you are not around.

I installed one in our coach and it was plug and play. I did screw up by putting the app on my phone first and then forgot what my password was.  I had to delete everything and start over.  Only other problem was if hooked up to wifi the name has to be longer then 3 letters or numbers.

This is the one I have as well, but if you go through the selector for the 4-button t-stat option, they say they don't offer one unless you upgrade the control boards:

Quote
Upgrading to the CCC (3109229.009) or CCC1 (3311557.000) control board would allow you to use our ASY-357-X01 (black) or ASY-357-X02 (white)

Upgrading to the CCC2 (3312227.000) control board would allow you to use our ASY-350-X01 (black) or ASY-350-X02 (white)
Keith
2003 U320 38' #6197

Re: Thermostat Replacement

Reply #6 –
FYI, Micro air is for 5 button thermostats. I won't work for the 4 button version.
JIm

2002 U320
Jim Frerichs
2002 U320 42'

Re: Thermostat Replacement

Reply #7 –
I did the repair with just clean and replace the internal parts of the switch. Worked much better, but now need to do it again for the up and down buttons. Pay attention to Jim's instructions on how to remove the thermostat cover, it may keep you from tearing these old and rare thermostats.
1998 36 foot U270 Build No. 5328 WTFE, 900 watts solar, Victron controller, B2B, bat monitor, 600 AMPH lithium with 2018 Chevy Colorado toad, SKP #110239, Motorcade #17781, 2021 Escape 17B for when Coach is broken down and campsites are too small, retired and full-timer since Dec. 2020. Part of RV family since 1963.
 

Re: Thermostat Replacement

Reply #8 –
Not an easiest rebuild of the four button Dometic thermostat switches...there are very small spring parts inside that often become weak again anyway. Some folks who attempt the repair have lost some parts. Don't ask me how I know this.
Nothing like all new switches to get good long term use.
JIm

2002 U320
Jim Frerichs
2002 U320 42'