Dometic AC 13.5K fan failure.
2005 Mobile Suites fifth wheel 36 ft with typical Dometic set up. Zone 1 Living area has 15K A/C with HP. Zone 2 is Bedroom with 13.5K Air conditioner only. Both are OE, Furnace is 42K all hooked ...
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Thank you one and all. Imgoin4it wins the prize today. If you found this thread while trying to solve the same problem here is the solution. The yellow wire in the control board must be removed for the new motor to work with the current board. Doug, I did open up the other unit and as best I can tell the boards are the same. I did not pull the working unit board out to install in the other unit. I was about to and I thought about the yellow wire and the fact that it is for medium speed and I of course have no medium setting. I pulled on the yellow wire in the working unit and to my amazement it came loose and was capped on the end. At that point I had an awakening. I went to the problem unit and removed the yellow wire from the board, went down restored power turned the stat on hi cool and watched as the unit worked as designed. Wow, thank y'all for the help.
What I'm not sure about is the sequence of events. The first problem was a bad board which I replaced. I am almost sure the unit worked right after that. It was very hot last summer and I would remember if I had AC problems. So, I'm thinking that the new board worked with the old motor. When the unit started failing in high cool mode in florida I tried the caps and then removed the motor. The motor had black winding in places and burnt looking paper. My brother in law who is pretty knowledgeable about all things electric looked at a picture I sent him and pronounced it toast. So I installed a new motor. I think and it's nothing more than a thought, that the combination of the new board and the new motor, caused the failure I was experiencing. Removing the yellow wire from the board removes whatever the conflict is. After I had run the unit for an hour I shut it down and re attached the yellow wire. I then restarted on cool high and watched the temperature of the motor. It was climbing pretty fast so I pulled the yellow wire off the board and it was like I had shifted a gear. I could hear and feel the motor relax. Thanks again.
What I'm not sure about is the sequence of events. The first problem was a bad board which I replaced. I am almost sure the unit worked right after that. It was very hot last summer and I would remember if I had AC problems. So, I'm thinking that the new board worked with the old motor. When the unit started failing in high cool mode in florida I tried the caps and then removed the motor. The motor had black winding in places and burnt looking paper. My brother in law who is pretty knowledgeable about all things electric looked at a picture I sent him and pronounced it toast. So I installed a new motor. I think and it's nothing more than a thought, that the combination of the new board and the new motor, caused the failure I was experiencing. Removing the yellow wire from the board removes whatever the conflict is. After I had run the unit for an hour I shut it down and re attached the yellow wire. I then restarted on cool high and watched the temperature of the motor. It was climbing pretty fast so I pulled the yellow wire off the board and it was like I had shifted a gear. I could hear and feel the motor relax. Thanks again.
