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Compressor starts, but airhandling motor does not

2005 Coachmen Freelander equipped with a duo therm ducted roof A/C unit. A/C compressor starts, but air handling motor does not, regardless if motor setting is high or low on the thermostat. Same thermostat controls basement ducted furnace. That all works fine. Beginning to suspect the starter capacitor, but am wondering if there is something more "obvious" to check? Unit worked when it went into storage in October, doesn't work at the campground now in July - first outting of the year. I wouldn't Michigan winter shouldn't have caused this!

Analog control system is part no. 3107541.009 if that has any bearing.

(Vacation seems to only be for the kids - I'm always working on this @#$% thing!)

Thanks.

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Sounds like you may have a bad fan capacitor or a bad fan motor. Remove the inside cover from the air conditioner and access the squirrel cage fan or, remove the shroud from the top to access the fan that way. Have someone turn the thermostat on as you spin the fan motor by hand. If the motor starts and runs, then you have a bad capacitor. If the fan motor still does not come on, then there are a couple of possible problems.

When you turn the thermostat to fan, do you hear an audible click in the control unit of the ac? If so, then you know that the thermostat is sending 12V to the fan relay on the board.

I think the motor just may be frozen up. Try spinning the motor by hand and see what happens. Again, if it starts, then just lube the shaft points on the motor with some WD-40 and all should be fine. If the fan motor starts and then after the cycle, does not restart, then you definitely have a bad capacitor.

Hope this helps,

Jeff

Posted on Jul 03, 2009

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