Thermostat Locking up

[MTT]

I have a 2007 Country Coach Intrigue. I had a problem with my Thermostat locking up. I ordered a new upgraded one and am having the same problem. I noticed on other forums about adding a noise filter. I checked and there is all ready one on it. Do they go bad or wear out? Not much help from RVP. Told me to hook up a 12 volt battery to it and then what? I can reset it, pulling fuse waiting 5 minutes and replacing and waiting 10 minutes to turn on, sometimes I have to reset 2 or 3 times, but it may last 1 day, 8 hours or 10 minutes before locking up again. No Error code just locks and none of the buttons work. Any help? Thanks

[adamfolger]

I was having the same issue and believe it or not the problem was the fluorescent light over the sink causing noise and making the tstat act up. I never had that problem with the old Penguin air conditioner but the new Penguin ll required a special control board to communicate with my old 5 button tstat. This may not be your problem but it is easy to find out. Turn off all fluorescent lights and reset the tstat. Let us know...

[MTT]

Ok I will give it a try. Thanks

[MTT]

So did you replace the fixture or the bulbs or both?

[adamfolger]

I don't use that light fixture while running air conditioners. I think it doesn't matter if the bulbs are new. The wires from the tstat run right beside the light fixture wires. Did my suggestion help or not? Curious people want to know...

[MTT]

Last night it worked fine with fluorescent light off. This morning it locked up again. :(

[MTT]

Update I've tried everything and it still locks up. I spent countless hours with a tech online and tried everything and was finally told it must be a bad thermostat. I have reinstalled original thermostat and am going to try to return the new one I purchased for another. I had one RV service man say there was a bad batch of those thermostats and they had to get 3 or 4 before they got one to work properly. If I don't touch it, it works fine but once in awhile when I go to change zones is when it locks up. The other thing the digital temp reads 00 every so often and then goes back to the correct temperature reading on its own. It also has a noise filter all ready installed. Thanks for advice anyway.

[TXiceman]

Try m0ving the thermostat power wire in to a fused circuit that has no other users on that circuit. Better yet, a direct run to the battery bank. The newer fancy thermostats are subject to interference on the wires.

Ken

[MTT]

Good idea That's next. Thanks

[MTT]

Does anyone know, on my digital Coleman thermostat, old or new, what does it mean when the temperature goes to 00? When it is in that mode the thermostat locks up if you touch any buttons, if you wait a while it will go back to the temperature and work properly. I have done many tests, tricks, and suggestions from RV service centers and technicians and still have no solution. Coleman RVT is NOT customer friendly.
I did not run a separate wire from my batteries. I would like to find the cause and solution and not run wires through enclosed compartments, slide outs etc. but thanks anyway.

[firedoc]

I had this problem with
My thermostat. Replaced with new thermostat. Was fine for awhile and then started doing same thing. In fact some times I would have to unplug thermostat to 'reset' it. Then I replaced both fluorescent lights in rig with LED. Problem went away and did not return. I had heard that ballasts could cause problem but didn't believe it. Maybe now I do!

[MTT]

I have one fluorescent light above the kitchen sink. I have left it off and still have the same results. FYI I also checked and there is an inline filter before thermostat electrical connection. Thanks

[wfalch]

I have also heard about ballast going bad and screwing up the thermostat. As I have said in the past flat telephone wire is junk.

[TQ60]

You can get ferrite beads to loop the wires through.

Google RFI mitigation as there are many simple tricks to blocking Rf noise that gets picked up in wiring.