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Old 08-02-2021, 04:34 PM   #1
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Question Basement AC/Heat Unit

I am new to this community and the motor home world. I have a 2004 40’ Alpha See Ya Gold Motor home build is 72068. It was abit rough but is coming together nicely. I still have one issue that I can’t figure out and needing some help. Its the basement AC/HEat unit . I can’t get it to work. I have 12volts where I need 12 volts etc. and I have 120volts where it is needed. I have 4 very quick flashing green lights then a pause and it repeats. I had to replace the control board as the old one was burned in all the places this unit is famous for. I updated the control board with the new style.
I can’t get anything to work on the unit meaning I can’t even get the fan to come on. I can jump the fan and it works but thats about it. Any suggestion of what to do. I took the motorhome to a RV repair shop they looked at it for about a month and could not or did not help. Any help would be greatly appreciated.
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Old 08-02-2021, 04:46 PM   #2
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Have you found a manual for the heat/AC unit yet? There is almost always a troubleshooting guide in it that will tell you what the flashes mean and where to look -

Cuz obviously you don’t have the 12 volts or 120 volts in ALL the right places. ��

Them blinking lights are probably trying to tell you something.
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Old 08-02-2021, 05:31 PM   #3
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Hi ! Welcome to IRV2! We're sure glad you joined us!

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Old 08-02-2021, 05:31 PM   #4
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When Shelburne RV replaced the control board in my coach, they had to replace the thermostat also.
Atlanta GA
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Old 08-03-2021, 08:03 AM   #5
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Basement AC

Well, I got it working this morning. Some great comments from many and it got me thinking. When I changed the old control board out for the new control board I crossed two wires and those two are AC1 and AC1White. So, if any are doing this make sure you get T1 from the old board to the right connection on the new board and that will help you not make the same mistake I made. Happy RV everyone…
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Old 08-03-2021, 11:48 AM   #6
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Just a quick hint, when working with electrical units, take pictures before starting.

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