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General Discussion of preventative/corrective maintenance and other technical issues regarding your coach that are not covered in other Mechanic's Corner categories (ex. refrigerators, water heaters, and compressors).

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  #1  
Old 07-24-2008
Wandering Wandering is offline
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Default Dometic A/C

The Dometic roof A/c in my bedroom will not turn on. It is DEAD. The switch in the front of the coach for the a/c control is on rear and the a/c still won't turn on. I have checked all the circut breakers in the hall closet and they are fine... also 2 of the electrical plugs in the bedroom are dead. Any suggestions? THANKS!!
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  #2  
Old 07-25-2008
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Hi Tracy,

You didn't say how you checked your breakers so if you proved they are good with a meter then just disregard this.

As I’m sure you know most of the time when a breaker trips you can tell just by looking but I have seen a lot of them that “looked” and even “felt” like they were “on” even though they were tripped. If you haven’t already snapped the breakers “off” and back “on” you might try that.
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1991 40' WB ...From 2008 - Present
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Old 07-25-2008
Wandering Wandering is offline
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Hi John, I just snapped the breakers back and forth....I will check them with a meter. If there is no reading at the breaker does that mean the breaker is bad?
Thanks!
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Old 07-25-2008
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Quote:
Originally Posted by Wandering View Post
Hi John, I just snapped the breakers back and forth....I will check them with a meter. If there is no reading at the breaker does that mean the breaker is bad?
Thanks!
Hi Tracy,

If after you check for voltage at the screw side of the breaker where the wire is attached and the other breakers on that side of the electrical breaker panel have power when tested, then the answer is yes the breaker is bad. Make sure that you remove the power source from your 'Bird be it from the shore, generator, solar, or inverter before you remove the defective breaker. Some people just shut the MAIN circuit breaker off to accomplish this, but I prefer to have no power coming into any part of the box when I do this, as I'm a firm believer in MURPHY and his law

One thing that I have found about some breakers, is when they TRIP off, they don't appear to be completely off and I have then gotten into a habit of finding the TRIPPED breaker, then force it over into the OFF position before resetting it to the ON position

Here is a link to a article about 120 volt circuit breakers http://www.bobvila.com/HowTo_Library...ing-F2234.html
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  #5  
Old 07-26-2008
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Try hittin' the panel the toggles are on, works for me when the rear air don't start.
MH
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  #6  
Old 07-26-2008
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tracy,the AC unit is on its own circut,the other two recepts that are not working may or may not be related.
i had a problem once with no power to a bedroom receptical,but there was also one in the bathroom and one in the kitchen that didnt work,and they were inverter recepts.
turns out that the inverter relay under the sink was bad.

but,the ac should not be on that circut,but the AC unit is controled by a relay that was in a clothes closet behind a little square cover,there will be three of those covers near each other.
those relays also control the electric heaters.and they are switched by the switchs on the dash area.
good luck,and let us know what happens.
Randy 93wb
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Old 07-26-2008
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Tracy,

I had the same problem with mine, everything down below checked out ok, and when I went up top and took the cover off I had a wire broken off. With the age of these coaches wiring and the vibration they go through, it might not be a bad idea to check that.
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Old 07-26-2008
Wandering Wandering is offline
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Hi Guys! Thanks for the tips. The electric heater in the bedroom also doesn't work. I hope it is just the relay. I will let you know! Thanks again!
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Old 07-26-2008
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What kind of ac power are you on? 50 Amps, Generator, 30 Amp with 50 Amp cheater? Do you have voltage showing on both of your ac meters. Did you flip the “Main” breakers off and on also? If you only have voltage on one leg it could be a cord problem or the receptacle you are plugged in to.

Have you had a chance to try the measurements that John Finn suggested?
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1991 40' WLWB-WTB
Body Number F095567
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1991 40' WB ...From 2008 - Present
1984 ½ PT-36 .From 2000 - 2008
1973 FC-31 .....From 1991 - 2001

Last edited by Dieselbird01; 07-26-2008 at 02:44 PM. Reason: spelling
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