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Posted on Jun 08, 2009
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Dometic 57915.531 - high fan does not work

Low fan works ok. problem is not with thermostat. what needs to be replaced?

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  • Posted on Jul 05, 2009
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Joined: Jun 29, 2009
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If it is a wall mounted thermostat, then you need to check the control box mounted on the inside of the unit. Remove the inner shroud to access. Check for power on the blue wire entering the control box from the thermostat, this is the high fan circuit. There should also be power on the orange(or tan) wire from the tstat. This is the fan circuit. Both these need to be hot with 12VDC for the fan to run on high. If you have power there, try removing the cover from the inside and access the squirrel cage (fan blade) inside the unit, turn the tstat to High fan and try starting the fan motor by hand. If it starts, then you have a bad fan capacitor. If not, check power to the fan on the top unit and all wiring leading to the fan. If you have power to the fan and it still does not run, you need a new fan motor.

Hope this helps,

Jeff

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