Question about Dometic Rooftop RV Air Conditioner
Bought from Lowes, unpacked, installed, lights come on but all I hear is a humming and occasional compressor noise (I believe). Fan won't run, tried every imaginable combination of settings, just a humming sound. (is there any packing material INSIDE the unit I need to remove?)
Slide out and spin blade by hand. should be able to tell if anything restricting rotation
Posted on Aug 23, 2015
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Posted on Jan 02, 2017
You hear the compressor kick in (Hum) but no fan comes on? Will the fan come on when just in fan mode, not cool, or do you have that set-up?
Posted on Aug 14, 2008
The fan motor is getting hot and going off on the internal overload in the motor.
This is caused by either a low voltage, a bad capacitor, or tight or dry bearings in the motor.
To check the bearings turn the power off to the unit, then spin the fan blade if it spins freely then the bearings are ok.
To check the capacitor you will need some kind of tester or you can buy a capacitor and replace it, that's what a lot of people do. They usually don't cost very much.
To check the voltage you will need a voltmeter and measure the volts at the unit.
Posted on Jun 09, 2009
You really need an Ammeter to check this problem. Just because it is a brand new unit does not mean that there isn't a problem with it. Is it run off of a wall thermostat or manual controls? The compressor has a thermal overload switch on the top (under the plastic cover) that will take the compressor out of the circuit if it gets too hot. However, if the entire unit is shutting off, there is another problem. Selector Switch? Thermostat? Let me know what kind of controls you have and we can go from there.
Posted on Jul 02, 2009
It sounds like the unit was miswired at the factory, since when the A/C is "off" at the thermostat, there should be no calls for cooling or for the fan to run.
You also stated the most puzzling issue, with the breaker turned "off" the same thing happens. This shouldn't happen at all, when the power breaker is turned off, there should be no power being supplied to the unit and it shouldn't be able to do anything. Very strange indeed, but likely a major error done when the RV was manufactured, or some wiring in the loom has somehow become shorted and is supplying power from another breaker/source.
I think a call to the manufacturer is in order since there is no easy solution aside from possibly rewiring the A/C circuit.
Not sure when your RV was made, but definately time to call the manufacturer and break out the wiring schematic in an attempt to isolate and resolve the problem.
Hope you find this helpful and best regards!
Posted on Aug 06, 2009
SOURCE: AC compressor will not engage
It could be the capacitor, it could be a loose wire connection, it could be a delay switch or a contactor/relay.
Posted on Mar 31, 2010
Testimonial: "You gave us a couple extra ideas than what we already thought of checking. Thank you. We will trade out parts from working one, see what it is. Thanks"
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