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Topic: Replace Four button Dometic "Duo-Therm Comfort Control" (Read 1626 times) previous topic - next topic

Replace Four button Dometic "Duo-Therm Comfort Control"

What is required to replace that confusing four button Dometic "Duo-Therm Comfort Control" with four independant analog thermostats, one for each furnace and one for each Air Conditioner?

Is it possible to connect to the controller boards and turn on/off heat or A/C?


Wyatt
96 U320 40 WTFE, build 4943
84 Toyota Supra towd
2015 Jeep Wrangler towd
Victoria, BC, Canada

Re: Replace Four button Dometic "Duo-Therm Comfort Control"

Reply #1 –
Wyatt, I agree that the Dometic Thermostats are confusing... however... If you have one that has failed the guy to contact is Bill Hendrix in Erie , CO.  He can rebuild these to like new.  I will look for his phone number later and post it.
Gary B

Re: Replace Four button Dometic "Duo-Therm Comfort Control"

Reply #2 –
I got this info about Bill Hendrix off the RV.net Open Roads forum.  I have no personal knowledge about his service:


"I refurbish DuoTherm 4 Button thermostats - part #310 6463.007, I have a very limited number available on an Exchange Basis. Give me your NAME - ADDRESS & PHONE NUMBER, tell me you are an honest person and I will send a refurbished, cleaned, sanitized & tested thermostat via Priority Mail -
-on the Honor System. You install, see it work then send me your check for $90.00 ALONG WITH THE OLD THERMOSTAT. That makes this a no risk, no down time transaction.

I DO NOT SELL OUTRIGHT -- THIS MUST BE AN EXCHANGE SALE -- THERE IS A CORE CHARGE OF $100.00 IF YOU DO NOT SEND ME THE OLD THERMOSTAT.

A return postage paid USPS shipping label will be enclosed for your convenience and you can re-use the box.

TWO provisions - THE DISPLAY ON THE EXCHANGE THERMOSTAT MUST WORK and I NEED THE OLD THERMOSTAT RETURNED WITHIN 10 DAYS.

If your LCD Display IS DEAD, CONSIDER GOING TO THE CURRENT 5 BUTTON SYSTEM FOR $232.00 - (ONE AIRCOND) - WITH INSTRUCTIONS.

PLEASE NOTE --- IF YOUR PROBLEM IS --

If FURNACE does not show on the display - that is a furnace problem and another thermostat will not fix that.If you have 2 or 3 air cond and you can't change zones AND a zone number will not appear on the display, that is a connection problem with the communications cable and another thermostat will not fix that until you correct the communication cable problem.

From time to time I have other thermostats and upper boards available.

Bill's contact info is:

William (Bill) Hendrix
370 Baker Lane
Erie, CO 80516
(303) 809-6006
whendrix@aol.com
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Surely, no age has been more fraught with insecurity than our own present time."

Re: Replace Four button Dometic "Duo-Therm Comfort Control"

Reply #3 –
Wyatt, check out " Dinosaurs Electronics" I Oregon. They repair the circuit boards also.
  Richard B.
Richard & Betty Bark & Keiko our Golden Doodle
2003 U320T 3820 PBDS
Build # 6215
MC # 16926
2016 Chevrolet Colorado 4X4 diesel

Re: Replace Four button Dometic "Duo-Therm Comfort Control"

Reply #4 –
I know Bill Hendrix personally-- he serves on the FMCA Technical Advisory Committee with me (I am Chairman of that committee).

He has been in the RV business a LONG time and has written a number of articles for the FMCA Magazine.

Brett
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: Replace Four button Dometic "Duo-Therm Comfort Control"

Reply #5 –
Quote from: P. Wyatt Sabourin –
What is required to replace that confusing four button Dometic "Duo-Therm Comfort Control" with four independant analog thermostats, one for each furnace and one for each Air Conditioner?

Is it possible to connect to the controller boards and turn on/off heat or A/C?


Wyatt, I expect once you get past the digital part of the system, good old relays are what you would be interfacing to.  Would take some hacking but could most likely be done.  Control wiring may or may not be adequate for analog changeover, doubt its usable. 
"Not so  long ago we were a nation of risk takers, riding five million pounds of  thrust straight into space."  Joe Gresh
Chuck Pearson
1996 U295
2018 Can Am X3 TurboRS

Re: Replace Four button Dometic "Duo-Therm Comfort Control"

Reply #6 –
Thanks Gary, but the issue is not that it has failed. I dismantled and cleaned the buttons so it works good. I will replace the buttons if it malfunctions again.

I do not like the tunnel vision I perceive with it.
I would rather have the visual feedback of looking at a thermostat to see what it is set to (like I have had in my house for decades).

I am hoping someone has wiring schematic or understands how an analog thermostat can be adapted to control a single furnace or an A/C unit.

Wyatt

Quote

Wyatt, I agree that the Dometic Thermostats are confusing... however... If you have one that has failed the guy to contact is Bill Hendrix in Erie , CO. He can rebuild these to like new. I will look for his phone number later and post it. Gary B

Gary B
95 U280
Wyatt
96 U320 40 WTFE, build 4943
84 Toyota Supra towd
2015 Jeep Wrangler towd
Victoria, BC, Canada

Re: Replace Four button Dometic "Duo-Therm Comfort Control"

Reply #7 –
I have emailed Bill Hendrix to request his help.
Wyatt
96 U320 40 WTFE, build 4943
84 Toyota Supra towd
2015 Jeep Wrangler towd
Victoria, BC, Canada