Question about Dometic Rooftop RV Air Conditioner

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Heat comes on with ac cooling

Ac unit will be running and cooling normally and it will start to emit a buzzing sound and the furnace will come on and start to blow hot air, after a short while both units will shut down . After a short time the ac will begin to cool again.

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What type of unit do you have fleet wood monaco ? useually this is a bad ground problem in a trailor motor home useually low voltage dc problem

Posted on Aug 01, 2009

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Posted on Jan 02, 2017

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I need help with a buzzing sound in my air conditioner.


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I am trying to connect it to my heating system and my two wire ac unit


If you are referring to a Thermostat, the wiring is normally R is Power (red wire), G is Fan (green wire), W is Heat (white wire), Y is Cooling (black wire). On the Furnace, the two wire from the AC would have 1 going to Y (cooling) on the furnace and the other wire going to C (common). The 2 wire from the AC is generally white and black.

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Intertherm Gas Furnace MiMB 077ABW We have just had this furnace and heat pump installed and we find that it takes at least 1 1/2 to 2 hours in the morning to bring the heat up from 15 Celsius to 21.5...


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Sounds like it could be a effiency function to warn you that the heat elements are on. Check your thermostat manual and see if you can turn this feature off. If this is not a feature then the thermostat may be wired wrong or something in the circuit may be trying to short out.

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Having a problem with my AC/Furnace. AC was working fine and was turned on for about 3 weeks. Thursday night it cooled off and we opened up until Saturday morning. On Saturday morning the AC would not turn...


I think your problem is poor usage of the device,i.e. overloading the system. try running better cables to your furnace and ac. The reason i am lead to believe that is. If you already hired a pro to come and fix it for you,and he/she could'nt then what else could it be? in my experience ac units use electricity like microwave ovens.and power tools

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If you have a Gas furnace in the Attic then the answer is yes. The outside condenser will not run if in fact you have a gas furnace.

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There's a buzzing sound coming from my central air conditioner unit outside. The fan is quiet but I hear a buzzing sound. Should that be happening? Sounds like there's something loose.


Things that are not broken: The big relay that powers the compressor often hums or buzzes when the unit is running. Several brands of heat pumps keep their reversing valve "on" any time the thermostat is set for "cool". They buzz, too.

If something really is loose, the only way to fix it is to look at the machine and take off panels until you find what is buzzing.

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