Question about Dometic Rooftop RV Air Conditioner

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I have a rv a/c unit that the t stat cycles faster than the compreesor doesnt have time to equalize then overloads and trips the breaker. does dou therm make a t stat that has a programmable sort cycle delay or something that could help?

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  • panilling9
    panilling9 May 11, 2010

    not sure on the thermostat



    be sure your air flow is not blowing on the thermostat

    be sure there is not a heat source near the stat light bulb etc:

    sometimes the cooling anticipator goes bad in the thermostats causing short cycle

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Bad news is I doubt it is your thermostat
Sounds like a compressor problem to my 15 years of experience

Posted on Mar 06, 2010

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Posted on Jan 02, 2017

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Tripping of the main breaker could be an indication of a short or an overload. To check for an overload you will need an amprobe to test the amperage load on the breaker. Turn all the secondary breakers off. Attach the amprobe by clamping it around one power wire. Turn the breakers on one at a time and check the reading of the amprobe. Most breakers will handle about 80 % of the breaker rating before tripping. If it trips below this point the breaker may be weak and will need to be replaced. If the amprobe pegs out at any time and the breaker trips the secondary breaker that was last turned on probably has a short in its wiring somewhere. Cuasing the breaker to trip. Underground wirng that has gone bad can sometimes take a while to trip the breakers so if there is any underground feeders it may be more difficult to track down a short. If the problem is an overload check both hot wire to see if the load is equal if the load is a lot higher on one leg than the other switching some circuits to the lower side may help. If the total load is just too high you may have to increase your service to a larger size. Hope -this helps
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There should be an overload protection device in series with the low voltage wiring(t-stat wiring) Is it resting on the heat strip or too close to it? It is a saftey device to shut off the heat strips if the fan quits or a fire in the heat strip section. check that or by pass it, if it stays running then ur thermal protector is bad, couple bucks at the parts house.

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Breaker breaks


This unit may have an internal overload mounted on top of the compressor. You would have to get to the
compressor to find out and it maybe faulty. That may
explain why the compressor comes on later on, this
overload protects the compressor from getting hot.

When you trip the breaker and then reset it again only to see it trip again almost sounds like a direct short or loose wire. It could also mean that your
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Try just operating the fan and see if it trips the breaker, if it does then either the blower motor is bad
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Is this a wall mount thermostat or manual control unit? What is the model of the air conditioner? The only way that this is going to happen is that power is jumping somewhere to the heater coil from the cool side.

If it is a wall mount thermostat, the yellow wire is the cool mode (compressor on) and both the tan and blue wires are the fan mode. The orange wire is for the heat strip. So if you set the thermostat on High/Cool, then you should have power at the yellow and blue wires, not the orange. If the orange wire is energized, then there is a problem.

Remove the orange wire from the thermostat, try it again. If the breaker trips, then remove the wire from the connection at the relay board. Once again, try the unit. If the breaker trips due to the same problem, then it has to be a bad relay board. If the breaker does not trip this time, then you have problem with your wiring between your thermostat and the control unit.

Sounds like you don't have manual controls since it has a relay board.

Hope this helps,

Jeff


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