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CentralCoastCam's avatar
CentralCoastCam
Explorer
Nov 14, 2017

Coleman Mach AC communications error help

I have a Coleman Mach 9330A633 15000 AC in my fiver, original equipemnt. It has a wireless thermostat. I noticed that the green system LED wasn’t on, and AC and gas heater controlled through it won’t work. Took off panel, and the green LED on the main box is flasshing twice, which according to the manual, is a communications error. Tried swapping out the phone cable that goes to the receiver unit, but no change. Is there a way to test the pc board on the receiver unit? Am I missing something? I am assuming the comm error means that the main box isn’t communicating with the receiver unit, but the manual is pretty skimpy and it doesn’t explain what a communications error actually is. Can the pc board in the receiver unit be replaced?
Any help is welcome.
  • CentralCoastCam's avatar
    CentralCoastCam
    Explorer
    Nov 14, 2017
    newman fulltimer wrote:
    kill all power to the unit it will reset the board


    I had already tried turning of the breaker, no change.
  • newman_fulltime's avatar
    newman_fulltime
    Explorer II
    Nov 14, 2017
    CentralCoastCampers wrote:
    newman fulltimer wrote:
    kill all power to the unit it will reset the board


    I had already tried turning of the breaker, no change.
    you have to kill both 110 and 12volt to reset the board
  • CentralCoastCam's avatar
    CentralCoastCam
    Explorer
    Nov 14, 2017
    newman fulltimer wrote:
    CentralCoastCampers wrote:
    newman fulltimer wrote:
    kill all power to the unit it will reset the board


    I had already tried turning of the breaker, no change.
    you have to kill both 110 and 12volt to reset the board

    That did it, thanks!
  • CentralCoastCam's avatar
    CentralCoastCam
    Explorer
    Nov 15, 2017
    newman fulltimer wrote:
    your system went bellow required voltage and board locked out

    Thanks, on the AC or DC side?
  • Jetstreamer's avatar
    Jetstreamer
    Explorer
    Nov 16, 2017
    I’ve got the same system in my Keystone Challenger.... don’t you wonder what they were smoking when that system was dreamed up?? I mean,what’s the advantage of a remote controller in a small living space that always has to have a line of sight connection to work?? Always having to worry whether it’s communicating properly and don’t even think of trying to find any replacement parts for that mess...there’s a good reason why that system was discontinued (as far as I know) a long time ago....
    I would love to convert to a plain old wall thermostat in my rig, but I’ll wait till mine takes a dump...again...
    When I had some issues with mine years back, I did get some good tech advice from RVP division of Coleman products. They were very helpful.
  • Joe417's avatar
    Joe417
    Explorer
    Nov 17, 2017
    Simple is always better, but todays generation wants remote everything.

    I just finished converting my neighbors Carrier remote system(no longer produced) into a digital wall thermostat unit. Cost $12 + the thermostat. They are much happier now.

    But they will have to get up walk 11 feet to the thermostat.
  • CentralCoastCam's avatar
    CentralCoastCam
    Explorer
    Nov 17, 2017
    Jetstreamer wrote:
    I’ve got the same system in my Keystone Challenger.... don’t you wonder what they were smoking when that system was dreamed up?? I mean,what’s the advantage of a remote controller in a small living space that always has to have a line of sight connection to work?? Always having to worry whether it’s communicating properly and don’t even think of trying to find any replacement parts for that mess...there’s a good reason why that system was discontinued (as far as I know) a long time ago....
    I would love to convert to a plain old wall thermostat in my rig, but I’ll wait till mine takes a dump...again...
    When I had some issues with mine years back, I did get some good tech advice from RVP division of Coleman products. They were very helpful.

    Yep, I agree, and the current tempauture never seems to work well, especially with the heater.
    However, I do have to say, in the almost 13 years I’ve had it, this was the first real problem I had with it.
  • Pennie67's avatar
    Pennie67
    Explorer
    Jun 07, 2018
    We have Keystone Everest with Coleman Mach 15000 btu and having receiver issues. Communications error. Called RVP and the people who made the remote and the infrared receiver went out of business in 2006. Trying to find parts because this is the first real problem we have had with it in 14 years. Would love to find a replacement part or a part to convert. Old model number 8335b676

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