Question about Heating & Cooling

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  • mgriffith11 Jul 01, 2008

    The roof air conditioner 20 amp breaker in converter trips within 20 minutes during heat of day. Sometimes it trips main breaker too. I noticed the panel around the AC breaker is hot when it trips. Overload? Only thing running is the AC, frig, carbon monoxide detector (all standard with the coach).

    I have replaced a battery, thinking that may have been the problem--nope--still tripping. My next step if I cannot get any advice here is is to replace the breakers (Main and AC)--faulty breaker?

    I heard there is an upgrade to my converter box which is a

    Magnatek, model 7345, Series 7300, 45 AMP, 775 WATTS. Anybody have any suggestions?



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Possible low voltage condition would cause that kind of a problem. To small a cord without the ability to carry and maintain the voltage would cause a voltage drop. I would test the voltage supply and make sure it is within 10% of that required for your A/C to operate properly.

Posted on Jun 16, 2008


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Voltage drops for 119 to 104 when the roof top unit is running, it will trip the 20 amp breaker occasionally.

You need a larger drop cord (heaver duty) from the service to the RV. You need to also check the Service plug in the side of your Rv for loose or corrosion in the socket. Then check the power connection to the A/c unit. Check these connections for loose wiring or getting hot. As the voltage drop means extra resistance along the path. Extra resistance means loose, dirty, or bad connections, and get hot, which can cause a fire.

Sep 12, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

We are having a problem with the central air. The thermostat was replaced with a regular house thermostat. Now the air conditioner stays running until it trips a breaker. When the breaker trips, it is...

Breakers are thrown by the build up of heat. And over time breakers do get weak try changing your breaker. Use the same size its plenty big. be careful and dont get bit by the electricity.

Aug 08, 2010 | Heating & Cooling

1 Answer

Rv ac throws the breaker when outside temp gets high, unit works fine at night when outside temp cools down

Clean evap and cond coils
Place hand on a/c if too hot during the day but cool at night
then freon is being restricted in the condensor
Cleaning coils may help days
Put a trickle of water on the condensor during the day for a test.

.If this was helpful please rate me.
Leo Ponder Appliance-Tyler,Texas

Aug 07, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

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
capacitor needs to be replaced or that you need a hard start kit and the unit needs a good cleaning.

Try just operating the fan and see if it trips the breaker, if it does then either the blower motor is bad
or it is still the capacitor.

Jun 25, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Breaker trips on roof top RV A/C

check your breaker is it hot to the touch?
check the wire tightness at the breaker?
remove the circuit breaker and inspect the terminals on the breaker and in the panel and the breaker itself for signs of overheating and discoloration due to the fact
check the connections at the unit itself
check that you have proper voltage to your unit
find the nameplate and look for FLA full load amp draw
is the breaker properly sized for the unit and is the wire size correct for the breaker?
(Check nameplate on unit)
buy a clamp on amp meter and see if it is under or over the nameplate rating when unit is running
take great care when you venture into electric,if you arent comfortable find someone who is.
you may have a weak breaker if all the above pass?
Replace it

Jul 05, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Roof Top A/C Throwing Main Breaker

do you have an amp meter. when the main is tripped what is running? maybe the main breaker is going bad. I dont think you are pulling more than 20 amps when everything is running. not unless the fan on the A/C shorts to ground when it gets hot????

let me know

Jun 22, 2009 | Dometic Rooftop RV Air Conditioner

4 Answers

Duo therm air conditioner

my duo therm air works beautifuly all day but at night when we go to bed it seams to turn on and shut off rapidly. what could be wrong?

Jul 06, 2008 | Dometic Rooftop RV Air Conditioner

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