We are having a problem with our Duo Therm 4 Button tstat displaying or switching from Zone 1 to Zone 2. It just is displaying bits of info, but nothing relavent to which keys I press. And since we cannot get it to display Zone 1, we cannot use our furnace either. I've been researching and since our mh is a 1999 and it's a 4 button unit, it's been recommended that we upgrade to a 5 button tstat. So more research has shown that since we have 2 Dometic Brisk Air Conditioners and one Atwood furnace, I have to purchase a 5 button tstat, and two electic controllers, once for each air. So my question - does anyone have any experience or advice on how hard/easy these units are to install? I don't want to have to be resetting a bunch of dip switches or trying to figure out which wire goes where. I can do basic wiring, plus am pretty handy, so being that I'm upgrading and staying within the same mfg, the wiring colors at least should be the same??? Again, any advice would be appreciated!
Don't know your history with unit, but if you haven't tried pulling the fuse from the 12V supply circuit, that will sometimes reset the T-Stat. Some get buggered up by interferance from lights and other 12V items. It's a small computer, so reboot it...
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There is NO reboot on a Dometic CCC system. There is a reset, but that is NOT a reboot or repair for buttons not operating or failed display. ALL the reset does is confirm the DIP switch settings on each AC control board. There ARE rebuilders that advertise as Dinosaur does that will rebuild a 4 button. Doug
Might need to reset it. Instructions in pdf but I'll save you some time.
Turn control on to ensure annunciator data and light
are present. If data and light are present, continue to
next step. If data and light are not present, see Sec.
Depress MODE switch to activate annunciator light.
Simultaneously depress the bottom two buttons
(temperature UP and DOWN) and hold.
While holding these buttons down, depress the
MODE button once and release.
Release the two buttons previously held down.
Depress the MODE button once again.
At this time the light should extinguish, and the mode
should register "OFF". If not, repeat Steps 2 through
Retest system ensuring that all functions are present
Call these guys they can help Dinosaur Electronics, Lincoln City Oregon (541-994-4344) M-F 8to5 PST. Had mine rebuilt 75.00 plus shipping(minimal)turnaround was three days from the time i took it off the wall. This was a far better cry than buying the updated control boxs and going with a five button although if you ever do replace a unit you will have to go with a five button and a control box on the old unit and adjust your DIP switch. But short term have it rebuilt because new 4-buttons are hard to come by, believe me there quick. 3708