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Old 06-12-2022, 06:01 PM   #1
twindman
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Question Need fuse panel help

My bedroom A/C quit (after blowing the breaker). I think the voltage got down to 104 on that leg even with little amp draw. I reset the breaker and the AC won't even run the fan.

I wonder if the breaker is bad and now the question - Can I pop out a 20A breaker with power still on the rig - and nothing on the breaker turned on???? Otherwise I can power everything off and do it. I could then swap the other 20A breaker and try out the AC to see if the breaker is bad.
Thanks in advance.
 
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Old 06-12-2022, 09:43 PM   #2
rohrmann
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It's possible if you are careful, but to prevent damage to the panel and to yourself, I would at least suggest turning off the double 50 amp main breaker. I'm guessing you have checked the breaker for power with a voltmeter? If there is power at the wire terminal at the breaker with it turned on after a proper reset, then the breaker is good. No power with it turned on, then replace it. A proper reset of a breaker is a full movement of the handle to the off position followed by moving it to the on position.
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Old 06-13-2022, 07:12 AM   #3
Daryles
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Buy a multimeter, then you don't have to remove the breaker. Just check for voltages along the way and at the AC unit itself.

Using a multimeter
https://www.rvtravel.com/rv-electric...-meter-basics/

Basic uses of a multimeter for RVers


Be aware the 120vac power goes from the breaker to a "Power Sharing Switch" behind the basement wall on the ceiling under the stairs. This Switch is for the 3rd AC unit to share the circuit breaker with the bedroom AC BUT only allows the 3rd unit to run IF both are turned on at the same time.
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Old 06-13-2022, 08:41 AM   #4
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Can you pop out the breaker? Yes, if you are careful and know what you are doing. But unless you have a reason you need to leave power on I would turn power off.

I had the 20 amp breaker for my bedroom A/C start tripping a number of years ago. Replaced the breaker and it never tripped again.
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Old 06-13-2022, 10:44 AM   #5
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Tom and I swapped his breaker this morning. It appears he has a bigger issue with his a/c as it did not correct the issue.
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Old 06-22-2022, 02:18 PM   #6
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How long did you run it on low voltage? At that low of a voltage your compressor would’ve been running extremely hot there is a possibility that you could’ve done damage.
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Old 06-22-2022, 09:55 PM   #7
rohrmann
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Quote:
Originally Posted by Daryles View Post
Buy a multimeter, then you don't have to remove the breaker. Just check for voltages along the way and at the AC unit itself.


Be aware the 120vac power goes from the breaker to a "Power Sharing Switch" behind the basement wall on the ceiling under the stairs. This Switch is for the 3rd AC unit to share the circuit breaker with the bedroom AC BUT only allows the 3rd unit to run IF both are turned on at the same time.

Just to make others aware, the rig in question is a 2013 model, and those do not have any "Power Sharing Switches. This feature would only be available on much newer rigs, so on these "old rigs", each A/C unit has it's own dedicated breaker and does not share with any other loads.
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Old 06-22-2022, 10:53 PM   #8
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Since you state that even the blower fan doesn't turn on, and the breaker has been replaced, your focus should be on determining if there is both 12 volt and 120 volt power at the a/c unit. A trip to the roof is where you will probably have to look. Without proper knowledge or test equipment, your investigation will be limited to looking for and smelling for, burnt wiring.....or the start run capacitor (which is usually a dual type that supplies a starting circuit to both the compressor and the blower motor) can sometimes give tell tale signs that it has failed by manifesting a domed top where the wires are connected. Poor voltage and voltage spikes are capacitor killers.
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Old 06-23-2022, 09:30 AM   #9
richeyb
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I have a Progressive EMS that protects my Montana electrical System. When it detects low voltage it turns off the electrical circuit. of Course this cuts power to our AC, once the EMS cycles and turns on the power the AC will kick on. This will continue until the low voltage issue is solved. Bottmline it’s an electrical issue not an AC issue.
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Old 06-23-2022, 09:51 AM   #10
firestation12
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Not so fast

Quote:
Originally Posted by richeyb View Post
I have a Progressive EMS that protects my Montana electrical System. When it detects low voltage it turns off the electrical circuit. of Course this cuts power to our AC, once the EMS cycles and turns on the power the AC will kick on. This will continue until the low voltage issue is solved. Bottmline itís an electrical issue not an AC issue.

Other than a loss of freon, an A/C failing to work IS and electrical issue. The electrical issue may be internal to the unit itself such as: shorted or open compressor winding= electrical issue, blown start/run capacitor= electrical issue, low voltage thermostat circuit/fuse blown= electrical issue, circuit board failure= electrical issue. The OP may very well find his problem outside of the A/C unit itself, but there is no smoking gun here that says to eliminate looking for the problem under the A/C bonnet.
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